{"id":1426,"date":"2019-02-22T18:30:54","date_gmt":"2019-02-22T09:30:54","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1426"},"modified":"2025-10-06T17:11:23","modified_gmt":"2025-10-06T08:11:23","slug":"java-return","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-return","title":{"rendered":"Java\u306ereturn\u3068\u306f\uff1f\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u623b\u308b\u30fb\u623b\u308a\u5024\u3092\u623b\u3059return\u306e\u4f7f\u3044\u65b9\u3068\u6d3b\u7528\u65b9\u6cd5"},"content":{"rendered":"<p><strong>Java\u3067\u306ereturn\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u3092\u7d42\u4e86\u3055\u305b\u3066\u547c\u3073\u51fa\u3057\u5143\u306b\u51e6\u7406\u3092\u623b\u3059\u6642\u3068\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u308a\u5024\u3092\u623b\u3059\u6642\u306b\u4f7f\u3046\u3082\u306e\u3067\u3059\u3002<\/strong><\/p>\n<p>\u3068\u3001\u3053\u306e\u3088\u3046\u306b<span>return<\/span>\u306f\u5358\u7d14\u306a\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30de\u3092\u60d1\u308f\u305b\u307e\u3059\u3002\u7279\u306b\u3001<span>try-catch-finally<\/span>\u3068\u7d44\u307f\u5408\u308f\u3055\u3063\u305f\u6642\u306f\u3001\u4eba\u306b\u3088\u3063\u3066\u306f\u76f4\u611f\u3068\u53cd\u3059\u308b\u52d5\u304d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u3069\u3053\u3067\u3069\u3046\u3084\u3063\u3066<span>return<\/span>\u3092\u3059\u308b\u304b\u3002\u3053\u308c\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5206\u304b\u308a\u3084\u3059\u3055\u306b\u3082\u5927\u304d\u304f\u5f71\u97ff\u3059\u308b\u3001\u306a\u304b\u306a\u304b\u4fae\u308c\u306a\u3044\u3082\u306e\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<strong>return\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u672c\u304b\u3089\u304a\u4f1d\u3048\u3057\u307e\u3059<\/strong>\u3002\u305d\u3057\u3066\u3001\u5206\u304b\u308a\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u305f\u3081\u306e<span>return<\/span>\u3082\u304a\u4f1d\u3048\u3057\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u3053\u306e\u8a18\u4e8b\u3067\u8272\u3005\u306a\u30b3\u30c4\u3092\u5b66\u3093\u3067\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001<span>Java 11<\/span>\u306e\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Javareturn\">\uff11\uff0e\u3010Java\u3011return\u3068\u306f\u3069\u3046\u3044\u3046\u3082\u306e\u304b<\/a><ul><li><a href=\"#-return\">\uff11-\uff11\uff0ereturn\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u3059\u3050\u7d42\u4e86\u3055\u305b\u3001\u623b\u308a\u5024\u3092\u623b\u3059\u3082\u306e<\/a><\/li><li><a href=\"#-return-2\">\uff11-\uff12\uff0ereturn\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u306a\u3089\u3044\u3064\u3067\u3082\u3067\u304d\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#Javareturn-2\">\uff12\uff0e\u3010Java\u3011return\u3068\u623b\u308a\u5024<\/a><ul><li><a href=\"#-void\">\uff12-\uff11\uff0e\u623b\u308a\u5024\u304cvoid\u3067\u306a\u3044\u306a\u3089\u623b\u308a\u5024\u304c\u5fc5\u9808<\/a><\/li><li><a href=\"#-return-3\">\uff12-\uff12\uff0ereturn\u306e\u623b\u308a\u5024\u306f\u4e92\u63db\u6027\u304c\u3042\u308b\u5024\u3084\u578b\u3067\u3042\u308c\u3070\u3088\u3044<\/a><\/li><li><a href=\"#-void-2\">\uff12-\uff13\uff0e\u623b\u308a\u5024\u304cvoid\u306a\u3089\u623b\u308a\u5024\u3092\u8fd4\u305b\u306a\u3044<\/a><\/li><\/ul><\/li><li><a href=\"#return\">\uff13\uff0e\u3010\u767a\u5c55\u3011return\u306e\u3044\u308d\u3044\u308d<\/a><ul><li><a href=\"#-return-4\">\uff13-\uff11\uff0ereturn\u3067\u306f\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4e0a\u624b\u306b\u4f7f\u304a\u3046<\/a><\/li><li><a href=\"#-try-catch-finallyreturn\">\uff13-\uff12\uff0etry-catch-finally\u3068return\u306b\u306f\u3054\u6ce8\u610f\u3092!!<\/a><\/li><li><a href=\"#-return-5\">\uff13-\uff13\uff0ereturn\u3067\u8907\u6570\u306e\u5024\u3092\u623b\u3059\u65b9\u6cd5\u3042\u308c\u3053\u308c<\/a><\/li><li><a href=\"#-thisreturn\">\uff13-\uff14\uff0ethis\u3092return\u3059\u308b<\/a><\/li><li><a href=\"#-nullOptionalreturn\">\uff13-\uff15\uff0enull\u304b\u3082\u3057\u308c\u306a\u3044\u306a\u3089Optional\u3092return\u3059\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#return-2\">\uff14\uff0e\u3010\u767a\u5c55\u3011return\u306e\u30b9\u30bf\u30a4\u30eb<\/a><ul><li><a href=\"#-returnreturn\">\uff14-\uff11\uff0e\u3010\u304a\u52e7\u3081\u3011\u6761\u4ef6\u6b21\u7b2c\u3067\u5373return\u3059\u308b\u300c\u65e9\u671freturn\u300d<\/a><\/li><li><a href=\"#-return-6\">\uff14-\uff12\uff0e\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3084\u6c7a\u307e\u3063\u305f\u5834\u6240\u3060\u3051\u3067return\u3059\u308b<\/a><\/li><li><a href=\"#-return-7\">\uff14-\uff13\uff0e\u3067\u304d\u308b\u7bc4\u56f2\u3067\u65e9\u671freturn\u3092\u3057\u3088\u3046!!<\/a><\/li><\/ul><\/li><li><a href=\"#i\">\uff15\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javareturn\">\uff11\uff0e\u3010Java\u3011return\u3068\u306f\u3069\u3046\u3044\u3046\u3082\u306e\u304b<\/span><\/h2>\n<h3><span id=\"-return\">\uff11-\uff11\uff0ereturn\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u3059\u3050\u7d42\u4e86\u3055\u305b\u3001\u623b\u308a\u5024\u3092\u623b\u3059\u3082\u306e<\/span><\/h3>\n<p>return\u3092\u5b9f\u884c\u3059\u308b<span>(<\/span>\u300c<span>return<\/span>\u3059\u308b\u300d\u3068\u3082\u3088\u304f\u8a00\u3044\u307e\u3059<span>)<\/span>\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u3092\u305d\u306e\u5834\u3067\u3059\u3050\u306b\u7d42\u4e86\u3055\u305b\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7b87\u6240\u3092\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u7d50\u679c\u3068\u306a\u308b\u5024\u3092\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u3059\u5f79\u5272\u3082\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067<span>return<\/span>\u3068\u3044\u3046\u5358\u8a9e\u304c\u4f7f\u308f\u308c\u308b\u306e\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5236\u5fa1\u3092\u547c\u3073\u51fa\u3057\u5143\u306b\u300c\u623b\u3059\u300d\u3001\u3042\u308b\u3044\u306f\u51e6\u7406\u7d50\u679c\u3092\u547c\u3073\u51fa\u3057\u5143\u306b\u300c\u623b\u3059\u300d\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff11-\uff11-\uff11\uff0e\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u3092\u305d\u306e\u5834\u3067\u3059\u3050\u7d42\u4e86\u3055\u305b\u308b<\/h4>\n<p>return\u3059\u308b\u3068\u3001<span>return<\/span>\u3088\u308a\u3082\u5f8c\u308d\u306b\u66f8\u3044\u3066\u3042\u308b\u51e6\u7406\u306f\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002\u3055\u3089\u306b\u3001<span>return<\/span>\u3088\u308a\u5f8c\u308d\u306e\u51e6\u7406\u304c\u3044\u304b\u306a\u308b\u72b6\u6cc1\u3067\u3082\u52d5\u304b\u306a\u3044\u3053\u3068\u304c\u660e\u78ba\u306a\u5834\u5408\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tstatic void returnInMiddle(boolean b) {\r\n\t\tSystem.out.println(\"return\u3059\u308b\u524d\"); \/\/ \u3053\u306e\u51e6\u7406\u306f\u5f53\u7136\u5b9f\u884c\u3055\u308c\u3066\u2026\r\n\r\n\t\t\/\/ \u3053\u306eif\u6587\u306e\u4e2d\u3067return\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u305d\u3053\u304b\u3089\u5f8c\u308d\u306f\u52d5\u304b\u306a\u3044!!\r\n\t\tif (b) {\r\n\t\t\tSystem.out.println(\"return\u3057\u307e\u3059\");\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tSystem.out.println(\"return\u3057\u305f\u5f8c\"); \/\/ \u3053\u306e\u51e6\u7406\u306f\u5b9f\u884c\u3059\u3089\u3055\u308c\u306a\u3044\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSystem.out.println(\"\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u524d\");\r\n\t\treturnInMiddle(true);\r\n\t\tSystem.out.println(\"\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3060\u5f8c\");\r\n\t}\r\n}<\/pre>\n<p><strong><span class=\"f-marker-p\">\u5b9f\u884c\u7d50\u679c<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u524d\r\nreturn\u3059\u308b\u524d\r\nreturn\u3057\u307e\u3059 \u2190\u3053\u306e\u5f8c\u306b\"return\u3057\u305f\u5f8c\"\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u305b\u3093\r\n\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3060\u5f8c<\/pre>\n<h4>\uff11-\uff11-\uff12\uff0e\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u7d50\u679c\u3092\u623b\u3059<\/h4>\n<p>return\u3059\u308b\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u547c\u3073\u51fa\u3057\u5143\u306b\u5024\u3092\u623b\u305b\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5143\u3067\u306f\u3001\u623b\u308a\u5024\u3092\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u7d50\u679c\u3068\u3057\u3066\u4f7f\u3046\u306e\u304c\u666e\u901a\u3067\u3059\u3002\u3069\u3046\u3044\u3046\u5024\u304c\u623b\u305b\u308b\u304b\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u306e\u3055\u308c\u65b9\u306b\u3088\u308a\u307e\u3059\u3002\u8a73\u7d30\u306f\u6b21\u306e\u7ae0\u3067\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tstatic int multiply(int num) {\r\n\t\tint ret = num * 1000000; \/\/ \u2461\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u5f15\u6570\u306e\u6570\u5b57\u3092100\u4e07\u500d\u3057\u3066\u3001\r\n\t\treturn ret; \/\/ \u2462\u305d\u306e\u5024\u3092return\u3067\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u3059\u3068\u3001\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tint num = multiply(123); \/\/ \u2460123\u3092\u5f15\u6570\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\r\n\t\tSystem.out.println(num); \/\/ \u2463123000000\u304c\u5f97\u3089\u308c\u3066\u3044\u308b\u3002\u30e1\u30bd\u30c3\u30c9\u3067\u8a08\u7b97\u3057\u305f\u7d50\u679c\u304c\u623b\u3063\u3066\u304d\u3066\u3044\u308b!!\r\n\t}\r\n}<\/pre>\n<h3><span id=\"-return-2\">\uff11-\uff12\uff0ereturn\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u306a\u3089\u3044\u3064\u3067\u3082\u3067\u304d\u308b<\/span><\/h3>\n<p>return\u3067\u304d\u308b\u306e\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u306b\u9650\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u7d30\u304b\u304f\u8a00\u3048\u3070\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u304b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u7a2e\u3068\u3082\u307f\u306a\u305b\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d\u304b\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3068\u540c\u3058\u610f\u5473\u3067\u3042\u308b\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u306b\u3057\u304b\u66f8\u3051\u307e\u305b\u3093<span>(\u203bJava 11<\/span>\u6642\u70b9\u3067\u306f<span>)<\/span>\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Consumer;\r\n\r\nclass ReturnSample {\r\n\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304b\u3089\u306ereturn\r\n\tReturnSample() {\r\n\t\treturn;\r\n\t}\r\n\r\n\t\/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306ereturn\r\n\tvoid instanceMethod() {\r\n\t\treturn;\r\n\t}\r\n\r\n\t\/\/ static\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306ereturn\r\n\tstatic void staticMethod() {\r\n\t\treturn;\r\n\t}\r\n\r\n\t\/\/ \u30e9\u30e0\u30c0\u5f0f\u3067\u306ereturn\r\n\tvoid lambdaExpression() {\r\n\t\tConsumer&lt;String&gt; c = s -&gt; {\r\n\t\t\treturn;\r\n\t\t};\r\n\t}\r\n}<\/pre>\n<p>return\u306f\u3044\u3064\u3067\u3082\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u300c\u3082\u3046\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u306f\u7d42\u308f\u308a\u3067\u3044\u3044\u3084\u300d\u3068\u306a\u3063\u305f\u3089\u3001\u305d\u306e\u6642\u70b9\u3067\u3059\u3050\u3055\u307e<span>return<\/span>\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u304b\u3089<span>for<\/span>\u6587<span>\/while<\/span>\u6587\u306e\u3088\u3046\u306a\u30eb\u30fc\u30d7\u69cb\u6587\u306e\u4e2d\u3001<span>if<\/span>\u6587<span>\/switch<\/span>\u6587\u306e\u3088\u3046\u306a\u6761\u4ef6\u5224\u5b9a\u306e\u4e2d\u3001\u305d\u308c\u4ee5\u5916\u306e\u90e8\u5206\u3067\u3082<span>return<\/span>\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">for (int i = 0; i &lt; 10; i++) {\r\n\tif (i &gt; 5) {\r\n\t\treturn; \/\/ for\u6587\u306e\u4e2d\u3067\u3082return\u3067\u304d\u308b\r\n\t}\r\n}\r\n\r\nint i = 0;\r\nwhile (i &lt; 10) {\r\n\tif (i &gt; 5) {\r\n\t\treturn; \/\/ while\u6587\u306e\u4e2d\u3067\u3082return\u3067\u304d\u308b\r\n\t}\r\n}\r\n\r\nint j = 0;\r\nswitch(j) {\r\ncase 0:\r\n\tbreak;\r\ncase 1:\r\n\treturn; \/\/ switch\u6587\u306e\u4e2d\u3067\u3082return\u3067\u304d\u308b\r\n}\r\n\r\nint k = 0;\r\nif (k &gt; 10) {\r\n\treturn; \/\/ if\u6587\u306e\u4e2d\u3067\u3082return\u3067\u304d\u308b\r\n}<\/pre>\n<h2><span id=\"Javareturn-2\">\uff12\uff0e\u3010Java\u3011return\u3068\u623b\u308a\u5024<\/span><\/h2>\n<p>return\u306f\u3001\u4e00\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u306f\u623b\u308a\u5024\u304c\u3042\u308b\u30fb\u306a\u3044\u306e\u5fc5\u305a\u3069\u3061\u3089\u304b\u4e00\u65b9\u3067\u3059\u3002\u3069\u3061\u3089\u306b\u306a\u308b\u304b\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u306e\u3055\u308c\u65b9\u3001\u7279\u306b\u623b\u308a\u5024\u306e\u6709\u7121\u3067\u6c7a\u307e\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-void\">\uff12-\uff11\uff0e\u623b\u308a\u5024\u304c<span>void<\/span>\u3067\u306a\u3044\u306a\u3089\u623b\u308a\u5024\u304c\u5fc5\u9808<\/span><\/h3>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u3067\u623b\u308a\u5024\u304c<span>void<\/span>\u3067\u306f\u306a\u3044\u306a\u3089\u3001<span>return<\/span>\u306b\u306f\u623b\u308a\u5024\u3068\u306a\u308b\u5024\u3001\u3042\u308b\u3044\u306f\u623b\u308a\u5024\u3068\u3059\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570\u3092\u300c\u5fc5\u305a\u300d\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u66f8\u304d\u65b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">return \u623b\u308a\u5024;<\/pre>\n<p>\u305d\u308c\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u3069\u3053\u304b\u3067\u3001\u623b\u308a\u5024\u304c\u3042\u308b<span>return<\/span>\u3092\u300c\u5fc5\u305a\u300d\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c\u5206\u304b\u3089\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3089\u3067\u3059\u306d\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3057\u305f\u306a\u3089\u5fc5\u305a\u305d\u306e\u578b\u306e\u5024\u304c\u623b\u308b\u3068\u3044\u3046\u300c\u7d04\u675f\u300d\u3067\u3059\u3002\u305d\u308c\u306f\u7d76\u5bfe\u306b\u5b88\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306fint\u3001\u3060\u304b\u3089\u5fc5\u305aint\u3092return\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\r\nint method() {\r\n\t\/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u9014\u4e2d\u3067\u306ereturn\u306f\u81ea\u7531\u306b\u884c\u3048\u308b\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn 0;\r\n\t}\r\n\r\n\t\/\/ \u3067\u3082\u3001\u3053\u3053\u306b\u4f55\u3082\u66f8\u3044\u3066\u3044\u306a\u3044\u306a\u3089\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t\/\/ if\u306e\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u4f55\u304c\u623b\u308b\u306e\u304b\u5206\u304b\u3089\u306a\u3044\r\n}<\/pre>\n<p>\u306a\u304a\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u304c<span>return<\/span>\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u3001\u30e1\u30bd\u30c3\u30c9\u3084\u95a2\u6570\u306e\u4e2d\u3067\u300c\u6700\u5f8c\u306b\u8a55\u4fa1\u3055\u308c\u305f\u5f0f\u306e\u7d50\u679c\u300d\u304c\u623b\u308a\u5024\u306b\u306a\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u3067\u3059\u304c\u3001<span>Java<\/span>\u3067\u306f\u5fc5\u305a\u660e\u793a\u7684\u306b<span>return<\/span>\u3092\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f<span>Java<\/span>\u3067\u306f\u7d76\u5bfe\u306b\u5b88\u3089\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u30eb\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<h3><span id=\"-return-3\">\uff12-\uff12\uff0ereturn\u306e\u623b\u308a\u5024\u306f\u4e92\u63db\u6027\u304c\u3042\u308b\u5024\u3084\u578b\u3067\u3042\u308c\u3070\u3088\u3044<\/span><\/h3>\n<p>return\u306e\u623b\u308a\u5024\u306f\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306a\u3089\u305d\u306e\u5024\u304b\u5909\u6570\u3001\u53c2\u7167\u578b<span>(\u2252<\/span>\u30af\u30e9\u30b9\u3001\u914d\u5217<span>)<\/span>\u306a\u3089\u305d\u306e\u578b\u3068\u898b\u306a\u305b\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570\u304b<span>null<\/span>\u3067\u3059\u3002\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u306e\u3067\u3059\u304c\u3001\u53c2\u7167\u578b\u306f\u5c11\u3057\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u3053\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3042\u308b<span>Java<\/span>\u306e\u7279\u5fb4\u304c\u73fe\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30e1\u30bd\u30c3\u30c9\u3067<span>return<\/span>\u3067\u304d\u308b\u306e\u306f\u3001<span>Number<\/span>\u305d\u306e\u3082\u306e\u304b<span>Number<\/span>\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u3002\u5177\u4f53\u7684\u306b\u306f<span>Integer\/Long\/Double<\/span>\u306a\u3069\u3067\u3059\u3002\u306a\u305c\u304b\u3068\u8a00\u3046\u3068\u3001<span>Integer<\/span>\u3084<span>Double<\/span>\u306f<span>Number<\/span>\u3068\u306e\u9593\u3067\u300c<span>IS-A<\/span>\u95a2\u4fc2\u300d\u3068\u8a00\u3046\u3082\u306e\u304c\u6210\u7acb\u3057\u3001<span>Integer<\/span>\u3084<span>Double<\/span>\u306f<span>Number<\/span>\u3060\u3068\u307f\u306a\u305b\u308b\u304b\u3089\u3067\u3059<span>(Integer is a Number)<\/span>\u3002<\/p>\n<blockquote>\n<p>\u3010\u53c2\u8003\u3011<span>is-a(Wikipedia)<\/span><\/p>\n<p><a href=\"https:\/\/ja.wikipedia.org\/wiki\/Is-a\">https:\/\/ja.wikipedia.org\/wiki\/Is-a<\/a><\/p>\n<\/blockquote>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u623b\u308a\u5024\u306e\u578b\u304c\u30af\u30e9\u30b9\u306eNumber\u306a\u306e\u3067\u2026\r\nNumber getNumber() {\r\n\t\/\/ Number\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306eInteger\u3082return\u3067\u304d\u308b\u3057\u3001\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Integer.valueOf(1);\r\n\t}\r\n\r\n\t\/\/ Number\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306eLong\u3082return\u3067\u304d\u308b\u3057\u3001\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Long.valueOf(2);\r\n\t}\r\n\r\n\t\/\/ Number\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306eDouble\u3082return\u3067\u304d\u308b\u3057\u3001\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Double.valueOf(3.14);\r\n\t}\r\n\r\n\t\/\/ null\u3067\u3082return\u3067\u304d\u308b\r\n\treturn null;\r\n}<\/pre>\n<p>\u3053\u306e\u7d04\u675f\u4e8b\u304c\u5b88\u3089\u308c\u3066\u3044\u306a\u3044\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u623b\u308a\u5024\u306b\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u623b\u308a\u5024\u306e\u578b\u304c\u30af\u30e9\u30b9\u306eInteger\u306a\u306e\u3067\u2026\r\nInteger getInteger() {\r\n\t\/\/ Integer\u306f\u3082\u3061\u308d\u3093return\u3067\u304d\u308b\u3051\u308c\u3069\u3001\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Integer.valueOf(1);\r\n\t}\r\n\r\n\t\/\/ Number\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306eLong\u306fInteger\u3067\u306f\u306a\u3044\u306e\u3067return\u3067\u304d\u306a\u304f\u3066\u3001\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Long.valueOf(2);\r\n\t}\r\n\r\n\t\/\/ Number\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306eDouble\u3082Integer\u3067\u306f\u306a\u3044\u306e\u3067return\u3067\u304d\u306a\u3044\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn Double.valueOf(3.14);\r\n\t}\r\n\r\n\t\/\/ \u53c2\u7167\u578b\u306e\u623b\u308a\u5024\u306a\u3089null\u306freturn\u3067\u304d\u308b\r\n\treturn null;\r\n}<\/pre>\n<h3><span id=\"-void-2\">\uff12-\uff13\uff0e\u623b\u308a\u5024\u304c<span>void<\/span>\u306a\u3089\u623b\u308a\u5024\u3092\u8fd4\u305b\u306a\u3044<\/span><\/h3>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c<span>void<\/span>\u306a\u3089\u3001<span>return<\/span>\u306b\u306f\u623b\u308a\u5024\u3092\u6307\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u623b\u308a\u5024\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u66f8\u304d\u65b9\u3060\u3051\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067<span>return<\/span>\u3059\u308b\u5834\u5408\u3082\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u306f\u623b\u308a\u5024\u306f\u306a\u3044<span>(<\/span>\u66f8\u304b\u306a\u3044\u3067\u3059\u3088\u306d<span>?)<\/span>\u6271\u3044\u304c\u3055\u308c\u308b\u306e\u3067\u3001\u3053\u3061\u3089\u306e\u66f8\u304d\u65b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">return;<\/pre>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067<span>return<\/span>\u3092\u3059\u308b\u3053\u3068\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c<span>void<\/span>\u306a\u3089\u5fc5\u9808\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u7d42\u308f\u308a\u307e\u3067\u884c\u304d\u3064\u3051\u3070\u3001\u305d\u3053\u3067\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u306f\u81ea\u52d5\u7684\u306b\u7d42\u308f\u3063\u3066\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u51e6\u7406\u304c\u81ea\u52d5\u7684\u306b\u623b\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306f\u306a\u3044(void)\u3001\u3060\u304b\u3089return\u306f\u5fc5\u9808\u3067\u306f\u306a\u3044\r\nvoid method() {\r\n\t\/\/ \u4f55\u304b\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u306a\u3089\u3001\u9014\u4e2d\u3067return\u3057\u3066\u3082\u3044\u3044\r\n\tif (\u4f55\u304b\u306e\u6761\u4ef6) {\r\n\t\treturn;\r\n\t}\r\n\r\n\t\/\/ \u3053\u3053\u3067return\u3057\u306a\u304f\u3066\u3082\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306f\u306a\u3089\u306a\u3044\r\n}<\/pre>\n<p>\u3067\u3059\u306e\u3067\u3001\u623b\u308a\u5024\u304c\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u306a\u3089\u3001<span>return<\/span>\u3059\u3079\u304d\u3068\u3053\u308d\u306b\u3060\u3051\u66f8\u304f\u306e\u304c\u666e\u901a\u3067\u3059\u3002\u3082\u3061\u308d\u3093\u3001<span>return<\/span>\u3092\u66f8\u3044\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u3067\u3082\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u304b\u3089\u306f\u300c\u4f59\u8a08\u306a<span>return<\/span>\u3060\u306a\u3041\u3001<span>return<\/span>\u306e\u3053\u3068\u3092\u308f\u304b\u3063\u3066\u308b\u306e\u304b\u306a\u3041\u300d\u3068\u601d\u308f\u308c\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3088\u3002<\/p>\n<h2><span id=\"return\">\uff13\uff0e\u3010\u767a\u5c55\u3011<span>return<\/span>\u306e\u3044\u308d\u3044\u308d<\/span><\/h2>\n<h3><span id=\"-return-4\">\uff13-\uff11\uff0ereturn\u3067\u306f\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4e0a\u624b\u306b\u4f7f\u304a\u3046<\/span><\/h3>\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u3001\u4f7f\u3046\u4eba\u306f\u7a4d\u6975\u7684\u306b\u4f7f\u3044\u3001\u4f7f\u308f\u306a\u3044\u4eba\u306f\u5168\u7136\u4f7f\u308f\u306a\u3044\u3068\u3044\u3046\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u9593\u3067\u3082\u597d\u304d\u5acc\u3044\u304c\u5927\u5909\u6fc0\u3057\u3044\u6f14\u7b97\u5b50\u3067\u3059\u3002\u3067\u3082\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f<span>return<\/span>\u3068\u5927\u5909\u76f8\u6027\u304c\u3044\u3044\u3082\u306e\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u6587\u3067\u306f\u306a\u304f\u5f0f\u306a\u306e\u3067\u3001<span>return<\/span>\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002\u3059\u308b\u3068\u3001\u305d\u308c\u304c<span>return<\/span>\u306e\u305f\u3081\u306e\u8a18\u8ff0\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u69cb\u6587\u4e0a\u3067<span>else<\/span>\u6271\u3044\u306e\u8a18\u8ff0\u304c\u5fc5\u9808\u306a\u306e\u3067\u3001<span>if<\/span>\u6587\u3067\u3046\u3063\u304b\u308a<span>else<\/span>\u3092\u66f8\u304d\u5fd8\u308c\u308b\u3068\u3044\u3046\u3088\u3046\u306a\u51e1\u30df\u30b9\u3092\u9632\u3052\u3082\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int i = 100;\r\n\r\n\/\/ if\u6587\u3092\u4f7f\u3063\u305f\u5834\u5408\r\nif (i &gt; 100) {\r\n\treturn 1;\r\n} else {\r\n\treturn 0;\r\n}\r\n\r\n\/\/ \u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\r\nreturn i &gt; 100 ? 1 : 0;<\/pre>\n<p>\u3057\u304b\u3082\u3001\u3053\u306e\u4f8b\u3067\u306f<span>if<\/span>\u6587\u3067<span>5<\/span>\u884c\u4f7f\u3046\u51e6\u7406\u3092\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u306f<span>1<\/span>\u884c\u3067\u66f8\u3051\u3066\u3044\u3066\u3001\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u306f<span>(<\/span>\u6163\u308c\u3066\u3057\u307e\u3048\u3070<span>)<\/span>\u4e00\u76ee\u77ad\u7136\u3067\u3059\u3002<span>if<\/span>\u5168\u4f53\u3092\u8996\u7dda\u3092\u52d5\u304b\u3057\u3066\u8abf\u3079\u308b\u3088\u308a\u3082\u3001\u3071\u3063\u3068\u898b\u308b\u3060\u3051\u3067<span>return<\/span>\u306e\u5168\u4f53\u30fb\u610f\u56f3\u304c\u5206\u304b\u308b\u306e\u304c\u826f\u3044\u3068\u611f\u3058\u307e\u3059\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u8907\u96d1\u306a\u6761\u4ef6\u306f\u82e6\u624b\u306a\u306e\u3067\u3001<span>if<\/span>\u6587\u3068\u306f\u9069\u6750\u9069\u6240\u3067\u3059\u3002\u3067\u3082\u3001\u5206\u304b\u308a\u3084\u3059\u304f\u3066\u8aad\u307f\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u98df\u308f\u305a\u5acc\u3044\u3092\u3059\u308b\u3088\u308a\u3082\u3001\u7c21\u5358\u306a\u3068\u3053\u308d\u304b\u3089\u3060\u3051\u3067\u3082\u4f7f\u3063\u3066\u307f\u3066\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<h3><span id=\"-try-catch-finallyreturn\">\uff13-\uff12\uff0etry-catch-finally\u3068<span>return<\/span>\u306b\u306f\u3054\u6ce8\u610f\u3092<span>!!<\/span><\/span><\/h3>\n<p>\u3055\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b<span>try-catch-finally<\/span>\u306e\u305d\u308c\u305e\u308c\u3067<span>return<\/span>\u3092\u66f8\u3044\u305f\u5834\u5408\u3001\u30e1\u30bd\u30c3\u30c9<span>tryCatchFinally<\/span>\u306e\u623b\u308a\u5024\u306f\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002<span>try<\/span>\u306e\u4e2d\u3067\u4f8b\u5916\u304c<span>throw<\/span>\u3055\u308c\u306a\u3044\u5834\u5408\u3001<span>throw<\/span>\u3055\u308c\u308b\u5834\u5408\u3067\u5206\u3051\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tstatic int tryCatchFinally(boolean throwException) {\r\n\t\tString str = throwException ? null : \"\";\r\n\t\tSystem.out.println(0);\r\n\r\n\t\ttry {\r\n\t\t\tstr.toString(); \/\/ Exception\u3092throw\u3059\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u4f55\u304b\u306e\u51e6\u7406\r\n\t\t\treturn print(1); \/\/ 1\u3092return\r\n\t\t} catch (Exception e) {\r\n\t\t\treturn print(2); \/\/ 2\u3092return\r\n\t\t} finally {\r\n\t\t\treturn print(3); \/\/ 3\u3092return\r\n\t\t}\r\n\t}\r\n\r\n\tstatic int print(int i) {\r\n\t\tSystem.out.println(i);\r\n\t\treturn i;\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSystem.out.println(\"return:\" + tryCatchFinally(false)); \/\/ \u2192 \u4f8b\u5916\u304cthrow\u3055\u308c\u306a\u3044\u5834\u5408\r\n\t\tSystem.out.println(\"return:\" + tryCatchFinally(true)); \/\/ \u2192 \u4f8b\u5916\u304cthrow\u3055\u308c\u308b\u5834\u5408\r\n\t}\r\n}<\/pre>\n<p>\u7b54\u3048\u5408\u308f\u305b\u3067\u3059\u3002\u4f8b\u5916\u304c<span>throw<\/span>\u3055\u308c\u306a\u3044\u5834\u5408\u306f<span>3<\/span>\u3001\u3055\u308c\u308b\u5834\u5408\u3082<span>3<\/span>\u3067\u3059\u3002\u5408\u3063\u3066\u3044\u307e\u3057\u305f\u304b<span>? <\/span>\u306a\u305c\u304b\u3053\u3046\u306a\u308b\u304b\u3068\u8a00\u3046\u3068\u3001\u4e00\u756a\u6700\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b<span>finally<\/span>\u3067<span>return<\/span>\u3092\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p><strong><span class=\"f-marker-p\">\u5b9f\u884c\u7d50\u679c<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">0\r\n1\r\n3\r\nreturn:3\r\n0\r\n2\r\n3\r\nreturn:3<\/pre>\n<p>\u30a4\u30e1\u30fc\u30b8\u7684\u306b\u306f\u3001<span>try-catch-finally<\/span>\u306e\u4e2d\u3067<span>return<\/span>\u3059\u308b\u3068\u3001<span>return<\/span>\u3059\u308b\u5024\u304c<span>Java<\/span>\u4e0a\u306e\u3069\u3053\u304b\u306b\u4e88\u7d04\u3055\u308c\u3001<span>return<\/span>\u304c\u52d5\u304f\u3068\u4e0a\u66f8\u304d\u3055\u308c\u308b<span>\u2026<\/span>\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002\u3067\u3059\u306e\u3067\u3001<span>try-catch-finally<\/span>\u306e\u4e2d\u3067\u4e00\u756a\u6700\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b<span>finally<\/span>\u3067<span>return<\/span>\u3057\u305f\u5024\u304c\u3001\u6700\u7d42\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff12-\uff11\uff0e\u4f8b\u5916\u304c<span>throw<\/span>\u3055\u308c\u306a\u3044\u5834\u5408<\/h4>\n<p>\u3053\u306e\u5834\u5408\u306f\u3001<span>try\u2192finally<\/span>\u306e\u9806\u756a\u3067\u52d5\u304d\u307e\u3059\u3002\u4f8b\u5916\u304c<span>throw<\/span>\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u306e\u3067\u3001<span>catch<\/span>\u306f\u52d5\u304d\u307e\u305b\u3093\u3002<span>finally<\/span>\u306f<span>try<\/span>\u306e\u7d50\u679c\u304c\u4f55\u3067\u3042\u308c\u3001<span>try<\/span>\u306e\u5f8c\u306b\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3082\u3046\u5c11\u3057\u7d30\u304b\u304f\u8a00\u3046\u306a\u3089\u3001<span>try<\/span>\u306e<span>return<\/span>\u304c\u52d5\u3044\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>try\u304c\u7d42\u308f\u3063\u305f\u6642\u70b9\u3067\u3001<span>return<\/span>\u3059\u308b\u5024\u3068\u3057\u3066\u306f<span>1<\/span>\u3067\u3042\u308b\u3068<span>Java<\/span>\u306f\u4e00\u65e6\u899a\u3048\u307e\u3059\u3002\u3067\u3059\u304c\u3001<span>finally<\/span>\u3067\u3082\u3046\u4e00\u5ea6<span>return<\/span>\u304c\u547c\u3070\u308c\u307e\u3057\u305f\u3002\u3067\u3059\u306e\u3067\u3001<span>return<\/span>\u3059\u308b\u623b\u308a\u5024\u304c<span>finally<\/span>\u3067\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b<span>3<\/span>\u306b\u5165\u308c\u66ff\u308f\u308a\u307e\u3059\u3002<\/p>\n<h4>\uff13-\uff12-\uff12\uff0e\u4f8b\u5916\u304c<span>throw<\/span>\u3055\u308c\u308b\u5834\u5408<\/h4>\n<p>\u3053\u306e\u5834\u5408\u306f\u3001<span>try\u2192catch\u2192finally<\/span>\u306e\u9806\u756a\u3067\u52d5\u304d\u307e\u3059\u3002\u4f8b\u5916\u304c\u9014\u4e2d\u3067<span>throw<\/span>\u3055\u308c\u3066\u3044\u308b\u306e\u3067<span>try<\/span>\u306e<span>return<\/span>\u307e\u3067\u306f\u5230\u9054\u3057\u307e\u305b\u3093\u304c\u3001<span>catch<\/span>\u306e<span>return<\/span>\u306f\u52d5\u304d\u307e\u3059\u3002<span>finally<\/span>\u306f<span>catch<\/span>\u306e\u7d50\u679c\u304c\u3069\u3046\u3067\u3042\u308c\u3001<span>catch<\/span>\u306e\u5f8c\u306b\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3082\u3046\u5c11\u3057\u7d30\u304b\u304f\u8a00\u3046\u306a\u3089\u3001<span>catch<\/span>\u306e<span>return<\/span>\u304c\u52d5\u3044\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>catch\u304c\u7d42\u308f\u3063\u305f\u6642\u70b9\u3067\u3001<span>return<\/span>\u3059\u308b\u5024\u3068\u3057\u3066\u306f<span>2<\/span>\u3067\u3042\u308b\u3068<span>Java<\/span>\u306f\u4e00\u65e6\u899a\u3048\u307e\u3059\u3002\u3067\u3059\u304c\u3001<span>finally<\/span>\u3067\u3082\u3046\u4e00\u5ea6<span>return<\/span>\u304c\u547c\u3070\u308c\u307e\u3057\u305f\u3002\u3067\u3059\u306e\u3067\u3001<span>return<\/span>\u3059\u308b\u623b\u308a\u5024\u304c<span>finally<\/span>\u3067\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b<span>3<\/span>\u306b\u5165\u308c\u66ff\u308f\u308a\u307e\u3059\u3002<\/p>\n<h4>\uff13-\uff12-\uff13\uff0efinally\u3067<span>return<\/span>\u3059\u308b\u306a\u3089<span>try\/catch<\/span>\u306b\u8981\u6ce8\u610f<span>!!<\/span><\/h4>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001<span>finally<\/span>\u3067<span>return<\/span>\u3059\u308b\u3068<span>try<\/span>\u3084<span>catch<\/span>\u3067<span>return<\/span>\u3057\u3066\u3082\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u306f\u7121\u8996\u3055\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u304a\u5206\u304b\u308a\u3044\u305f\u3060\u3051\u305f\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>finally<\/span>\u3067<span>return<\/span>\u3059\u308b\u6642\u306f\u3001\u610f\u56f3\u306b\u53cd\u3057\u305f\u623b\u308a\u5024\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3001<span>try<\/span>\u3084<span>catch<\/span>\u3067<span>return<\/span>\u3057\u3066\u3044\u306a\u3044\u304b\u3092\u3088\u304f\u8abf\u3079\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3082\u3057<span>finally<\/span>\u3067\u3060\u3051\u3067<span>return<\/span>\u3092\u3057\u305f\u3044\u306a\u3089\u3001\u623b\u308a\u5024\u3092\u5165\u308c\u308b\u5909\u6570\u3092<span>try<\/span>\u306e\u5916\u3067\u5ba3\u8a00\u3057\u3066\u4f7f\u3046\u306a\u3069\u3057\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int tryCatchFinally() {\r\n\tint ret = 0; \/\/ \u623b\u308a\u5024\u306e\u5909\u6570\u3092\u5ba3\u8a00(\u30c7\u30d5\u30a9\u30eb\u30c8\u306f0)\r\n\r\n\ttry {\r\n\t\t\/\/ Exception\u3092throw\u3059\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u4f55\u304b\u306e\u51e6\u7406\r\n\t\tret = 1;\r\n\t} catch (Exception e) {\r\n\t\tret = 2;\r\n\t} finally {\r\n\t\treturn ret;\r\n\t}\r\n}<\/pre>\n<h3><span id=\"-return-5\">\uff13-\uff13\uff0ereturn\u3067\u8907\u6570\u306e\u5024\u3092\u623b\u3059\u65b9\u6cd5\u3042\u308c\u3053\u308c<\/span><\/h3>\n<p>Java\u306e<span>return<\/span>\u3067\u623b\u305b\u308b\u30e2\u30ce\u306f\u4e00\u3064\u3060\u3051\u3067\u3059\u3002\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u306f\u8907\u6570\u306e\u5024\u3092\u623b\u3059\u69cb\u6587\u3001\u3044\u308f\u3086\u308b\u30bf\u30d7\u30eb<span>(tuple)<\/span>\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u6b8b\u5ff5\u306a\u304c\u3089<span>Java 11<\/span>\u306e\u6642\u70b9\u3067\u306f\u4e00\u3064\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u3082\u3001<span>Java<\/span>\u3067\u3082\u8907\u6570\u306e\u5024\u3092\u623b\u3059\u65b9\u6cd5\u304c\u306a\u3044\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u3053\u3067\u306f\u305d\u306e\u65b9\u6cd5\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h4>\uff13-\uff13-\uff11\uff0e\u914d\u5217<span>\/List\/Map<\/span>\u3092\u4f7f\u3046<\/h4>\n<p>\u6700\u3082\u5358\u7d14\u306a\u65b9\u6cd5\u306f\u3001\u914d\u5217\u3084<span>List<\/span>\u3092\u4f7f\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3054\u3068\u306b\u3069\u3093\u306a\u5024\u304c\u5165\u308b\u306e\u304b\u3092\u3001\u4ed5\u69d8\u3084<span>Javadoc<\/span>\u3067\u660e\u78ba\u306b\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u9593\u9055\u3048\u3066\u3057\u307e\u3046\u3068\u5fc5\u8981\u306a\u5024\u3092\u5f97\u3089\u308c\u306a\u3044\u306e\u3067\u3001\u547c\u3073\u51fa\u3057\u5143\u3067\u306f\u5341\u5206\u306b\u6c17\u3092\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u67d4\u8edf\u306b\u3084\u308a\u305f\u3044\u306a\u3089<span>Map<\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002\u30ad\u30fc\u3068\u3057\u3066\u6587\u5b57\u5217\u3092\u4f7f\u3046\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002\u30ad\u30fc\u3068\u3059\u308b\u6587\u5b57\u5217\u306f\u3042\u3089\u304b\u3058\u3081\u6c7a\u3081\u3066\u304a\u304d\u3001\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u4eba\u306b\u6559\u3048\u3066\u304a\u304d\u307e\u3059\u3002\u3053\u308c\u3082\u30ad\u30fc\u3092\u9593\u9055\u3048\u3066\u3057\u307e\u3046\u3068\u5024\u304c\u53d6\u5f97\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u6c17\u3092\u4ed8\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u306e\u65b9\u6cd5\u3092\u4f7f\u3046\u5834\u5408\u3001\u623b\u3057\u305f\u3044\u5024\u306e\u578b\u304c\u4e00\u3064\u306a\u3089\u3001\u307e\u3060\u5927\u304d\u306a\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u9055\u3046\u578b\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u6700\u60aa<span>Object<\/span>\u306b\u305b\u3056\u308b\u3092\u5f97\u305a\u3001\u547c\u3073\u51fa\u3057\u5143\u3067\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\u3060\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u3057\u3065\u3089\u3044\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3057\u3001\u6df1\u523b\u306a\u30d0\u30b0\u306e\u539f\u56e0\u306b\u3082\u306a\u308a\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Arrays;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\nclass MultipleReturnSample {\r\n\tstatic int[] multipleReturn1() {\r\n\t\treturn new int[] { 1234, 5678 };\r\n\t}\r\n\r\n\tstatic List&lt;Integer&gt; multipleReturn2() {\r\n\t\treturn Arrays.asList(1234, 5678);\r\n\t}\r\n\r\n\tstatic Map&lt;String, Integer&gt; multipleReturn3() {\r\n\t\tMap&lt;String, Integer&gt; ret = new HashMap&lt;&gt;();\r\n\t\tret.put(\"returnValue1\", 1234);\r\n\t\tret.put(\"returnValue2\", 5678);\r\n\t\treturn ret;\r\n\t}\r\n\r\n\tstatic Object[] multipleReturn4() {\r\n\t\t\/\/ Integer\u3068String\u3092\u914d\u5217\u3067\u4e00\u7dd2\u306b\u623b\u3057\u305f\u3044\u306a\u3089\u3001Object[]\u306b\u305b\u3056\u308b\u3092\u5f97\u306a\u3044\r\n\t\treturn new Object[] { Integer.valueOf(1234), \"5678\" };\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tint[] ret1 = multipleReturn1();\r\n\t\tSystem.out.println(ret1[0]); \/\/ \u2192 1234\r\n\r\n\t\tList&lt;Integer&gt; ret2 = multipleReturn2();\r\n\t\tSystem.out.println(ret2.get(0)); \/\/ \u2192 1234\r\n\r\n\t\tMap&lt;String, Integer&gt; ret3 = multipleReturn3();\r\n\t\tSystem.out.println(ret3.get(\"returnValue1\")); \/\/ \u2192 1234\r\n\r\n\t\tObject[] ret4 = multipleReturn4();\r\n\t\tInteger i = (Integer) ret4[0]; \/\/ \u914d\u5217\u306e\u578b\u306fObject\u306a\u306e\u3067\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b90\u306eInteger\u306b\u306f\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\r\n\t\tSystem.out.println(i); \/\/ \u2192 1234\r\n\t}\r\n}<\/pre>\n<h4>\uff13-\uff13-\uff12\uff0e\u623b\u308a\u5024\u5c02\u7528\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u3046<\/h4>\n<p>\u623b\u308a\u5024\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u3063\u3066\u4f7f\u3046\u65b9\u6cd5\u3067\u3059\u3002\u3053\u308c\u306a\u3089\u623b\u308a\u5024\u306e\u578b\u3092\u5fc5\u8981\u306a\u3082\u306e\u3060\u3051\u306b\u3067\u304d\u307e\u3059\u3057\u3001\u5024\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3084\u30ad\u30fc\u6587\u5b57\u5217\u3092\u610f\u8b58\u3057\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u3067\u3001\u304a\u52e7\u3081\u3067\u3059\u3002\u623b\u3057\u305f\u3044\u5024\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u8a2d\u5b9a\u3057\u3001\u30af\u30e9\u30b9\u306f\u5024\u3092\u53d6\u5f97\u3059\u308b<span>getter<\/span>\u306e\u307f\u3092\u6301\u3064\u3088\u3046\u306b\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u8907\u6570\u306e\u5024\u3092\u623b\u3057\u305f\u3044\u30e1\u30bd\u30c3\u30c9\u304c\u591a\u304f\u306a\u308b\u3068\u3001\u3053\u308c\u3060\u3068\u5c02\u7528\u306e\u30af\u30e9\u30b9\u3092\u305f\u304f\u3055\u3093\u4f5c\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u3061\u3087\u3063\u3068\u5927\u5909\u306b\u306a\u3063\u3066\u304d\u307e\u3059\u3002\u305d\u308c\u306b\u3001\u5024\u3068\u3057\u3066\u6271\u3046\u30af\u30e9\u30b9\u304c\u5c11\u3057\u3060\u3051\u9055\u3046\u3082\u306e\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u3067\u305f\u304f\u3055\u3093\u4f5c\u3089\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u3082\u306a\u308a\u304b\u306d\u307e\u305b\u3093\u3002\u305d\u3046\u306a\u308b\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30ab\u30aa\u30b9\u307e\u3063\u3057\u3050\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class MultipleReturnValue {\r\n\tprivate final String value1;\r\n\tprivate final Integer value2;\r\n\r\n\tMultipleReturnValue(String value1, Integer value2) {\r\n\t\tthis.value1 = value1;\r\n\t\tthis.value2 = value2;\r\n\t}\r\n\r\n\tString getValue1() {\r\n\t\treturn value1;\r\n\t}\r\n\r\n\tInteger getValue2() {\r\n\t\treturn value2;\r\n\t}\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">class MultipleReturnSample {\r\n\tstatic MultipleReturnValue multipleReturn() {\r\n\t\treturn new MultipleReturnValue(\"1234\", 5678);\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMultipleReturnValue ret = multipleReturn();\r\n\t\tSystem.out.println(ret.getValue1()); \/\/ \u2192 \"1234\"\r\n\t\tSystem.out.println(ret.getValue2()); \/\/ \u2192 5678\r\n\t}\r\n}<\/pre>\n<h4>\uff13-\uff13-\uff13\uff0e\u8907\u6570\u306e\u623b\u308a\u5024\u3092\u67d4\u8edf\u306b\u7ba1\u7406\u3067\u304d\u308b\u30af\u30e9\u30b9\u3092\u4f5c\u308b<\/h4>\n<p>\u3082\u3063\u3068\u67d4\u8edf\u306a\u3084\u308a\u65b9\u306b\u3057\u305f\u3044\u306a\u3089\u3001\u578b\u5f15\u6570\u3092\u6d3b\u7528\u3057\u3066\u3001\u8907\u6570\u306e\u623b\u308a\u5024\u3092\u6c4e\u7528\u7684\u306b\u6271\u3046\u3053\u3068\u306b\u7279\u5316\u3057\u305f\u30af\u30e9\u30b9\u3092\u7528\u610f\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u4e8c\u3064\u306e\u5024\u304c\u30da\u30a2\u306b\u306a\u308b\u306e\u3067\u3001<span>Pair<\/span>\u3068\u3044\u3046\u30af\u30e9\u30b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u5024\u3092\u5897\u3084\u3059\u306a\u3089\u3001\u6570\u306b\u5fdc\u3058\u305f\u540d\u524d\u306b\u3057\u307e\u3057\u3087\u3046<span>(<\/span>\u4e09\u3064\u306a\u3089<span>Triple<\/span>\u3068\u304b\u3067\u3059<span>)<\/span>\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class Pair&lt;V1, V2&gt; {\r\n\tprivate final V1 value1;\r\n\tprivate final V2 value2;\r\n\r\n\tPair(V1 value1, V2 value2) {\r\n\t\tthis.value1 = value1;\r\n\t\tthis.value2 = value2;\r\n\t}\r\n\r\n\tV1 getValue1() {\r\n\t\treturn value1;\r\n\t}\r\n\r\n\tV2 getValue2() {\r\n\t\treturn value2;\r\n\t}\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">class MultipleReturnSample {\r\n\t\/\/ \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u623b\u308a\u5024\u306fString\u3068Character\u3067\u3001\r\n\tstatic Pair&lt;String, Character&gt; multipleReturn1() {\r\n\t\treturn new Pair&lt;&gt;(\"1234\", '\u3042');\r\n\t}\r\n\r\n\t\/\/ \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u623b\u308a\u5024\u306fInteger\u3068Double\u3068\u306a\u308b\r\n\tstatic Pair&lt;Integer, Double&gt; multipleReturn2() {\r\n\t\treturn new Pair&lt;&gt;(1234, 5678.9);\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ \u623b\u308a\u5024\u306e\u30af\u30e9\u30b9\u81ea\u4f53\u306f\u540c\u3058Pair\u306a\u306e\u306b\u30011\u756a\u76ee\u30012\u756a\u76ee\u306e\u578b\u3092\u9055\u3046\u3082\u306e\u306b\u3067\u304d\u3066\u3044\u308b!!\r\n\t\tPair&lt;String, Character&gt; ret1 = multipleReturn1();\r\n\t\tSystem.out.println(ret1.getValue1()); \/\/ \u2192 \"1234\"\r\n\t\tSystem.out.println(ret1.getValue2()); \/\/ \u2192 '\u3042'\r\n\r\n\t\tPair&lt;Integer, Double&gt; ret2 = multipleReturn2();\r\n\t\tSystem.out.println(ret2.getValue1()); \/\/ \u2192 1234\r\n\t\tSystem.out.println(ret2.getValue2()); \/\/ \u2192 5678.9\r\n\t}\r\n}<\/pre>\n<p>\u306a\u304a\u3001\u3053\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u3068\u4f3c\u305f\u3082\u306e\u306f\u3001\u6a19\u6e96<span>API<\/span>\u306e\u4e2d\u306b\u4e00\u5fdc\u3042\u308a\u307e\u3059<span>(javafx.util.Pair<\/span>\u3001<span>java.util.AbstractMap.SimpleEntry<\/span>\u306a\u3069<span>)<\/span>\u3002\u3067\u3082\u30af\u30e9\u30b9\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u304c<span>JavaFX<\/span>\u3060\u3063\u305f\u308a\u3059\u308b\u306e\u3067\u3001\u306a\u304b\u306a\u304b\u6c17\u4ed8\u304d\u3065\u3089\u3044\u3067\u3059\u3002\u305d\u308c\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u540d\u304c\u30ad\u30fc<span>(Key)<\/span>\u3068\u5024<span>(Value)<\/span>\u306a\u306e\u3067\u3001\u3053\u3053\u3067\u8868\u73fe\u3057\u305f\u3044\u3053\u3068\u3068\u306f\u65b9\u5411\u6027\u304c\u9055\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u3053\u3046\u3044\u3046\u30af\u30e9\u30b9\u3092\u6570\u591a\u304f\u63d0\u4f9b\u3059\u308b\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u305d\u308c\u3089\u3092\u4f7f\u3063\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001<span>Apache Commons Lang<\/span>\u306e<span>Pair<\/span>\u3084<span>Triple<\/span>\u3001<span>javatuples(<a href=\"https:\/\/www.javatuples.org\/\" class=\"broken_link\">https:\/\/www.javatuples.org\/<\/a>)<\/span>\u306e<span>Pair<\/span>\u3001<span>Triplet<\/span>\u306a\u3069\u3067\u3059\u3002<\/p>\n<h3><span id=\"-thisreturn\">\uff13-\uff14\uff0ethis\u3092<span>return<\/span>\u3059\u308b<\/span><\/h3>\n<p>return\u3067\u306f\u81ea\u5206\u81ea\u8eab\u3092<span>return<\/span>\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001<span>this<\/span>\u3092<span>return<\/span>\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u4e00\u898b\u4f55\u306b\u4f7f\u3046\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3092\u4f7f\u3046\u5834\u5408\u306b\u305d\u3046\u3057\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tReturnSample method(String str) {\r\n\t\tSystem.out.println(str); \/\/ \u4f55\u304b\u306e\u51e6\u7406\u3092\u884c\u3063\u3066\u2026\r\n\t\treturn this; \/\/ \u81ea\u5206\u81ea\u8eab\u3092return\u3059\u308b!!\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ method()\u306f\u623b\u308a\u5024\u3068\u3057\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u81ea\u8eab\u304c\u623b\u308b\r\n\t\t\/\/ \u3060\u304b\u3089\u3001\u3053\u306e\u3088\u3046\u306b\u300c\u7e4b\u3052\u3066\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3079\u308b\r\n\t\tnew ReturnSample().method(\"A\").method(\"B\").method(\"C\").method(\"D\").method(\"E\");\r\n\r\n\t\t\/\/ \u2191\u306f\u3001\u3053\u308c\u3068\u540c\u3058\u3053\u3068\u3092\u3057\u3066\u3044\u308b\r\n\t\tReturnSample sample = new ReturnSample();\r\n\t\tsample.method(\"A\");\r\n\t\tsample.method(\"B\");\r\n\t\tsample.method(\"C\");\r\n\t\tsample.method(\"D\");\r\n\t\tsample.method(\"E\");\r\n\t}\r\n}<\/pre>\n<p>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306f\u3001\u4f8b\u3048\u3070<span>StringBuilder<\/span>\u3067<span>append<\/span>\u3092\u3059\u308b\u6642\u306e\u5e38\u3068\u3046\u624b\u6bb5\u3067\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u540c\u3058\u30e2\u30ce\u306b\u5bfe\u3057\u3066\u9023\u7d9a\u3057\u3066\u4f55\u304b\u3092\u3057\u3066\u3044\u308b\u306e\u3060\u3068\u3044\u3046\u3053\u3068\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u3067\u3082\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u5358\u7d14\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u884c\u6570\u3092\u5c11\u306a\u304f\u3057\u305f\u308a\u3001\u898b\u305f\u76ee\u3092\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u308b\u52b9\u679c\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u3055\u3089\u306b\u63a8\u3057\u9032\u3081\u308b\u3068\u300c\u6d41\u308c\u308b\u3088\u3046\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9<span>(fluent interface)<\/span>\u300d\u3068\u547c\u3070\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u624b\u6cd5\u306b\u3001\u3044\u305a\u308c\u305f\u3069\u308a\u7740\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u8a73\u7d30\u306f\u8ff0\u3079\u307e\u305b\u3093\u304c\u3001\u8208\u5473\u304c\u3042\u308c\u3070\u8abf\u3079\u3066\u307f\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002\u53c2\u8003\u306b\u306a\u308b\u77e5\u8b58\u304c\u5f97\u3089\u308c\u308b\u3067\u3057\u3087\u3046\u3057\u3001\u65e2\u5b58\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3082\u4f7f\u3063\u3066\u3044\u308b\u3082\u306e\u306f\u591a\u3044\u3067\u3059\u3002<\/p>\n<h3><span id=\"-nullOptionalreturn\">\uff13-\uff15\uff0enull\u304b\u3082\u3057\u308c\u306a\u3044\u306a\u3089<span>Optional<\/span>\u3092<span>return<\/span>\u3059\u308b<\/span><\/h3>\n<p>Optional\u3068\u3044\u3046\u30af\u30e9\u30b9\u3092<span>return<\/span>\u3059\u308b\u3068\u300c\u623b\u308a\u5024\u304c<span>null<\/span>\u304b\u3082\u3057\u308c\u306a\u3044\u304b\u3089\u6c17\u3092\u4ed8\u3051\u3066\u306d\u300d\u3068\u6559\u3048\u3066\u3042\u3052\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u7ae0\u3067\u3001\u8907\u6570\u306e\u5024\u3092\u623b\u3059\u6642\u306f<span>Pair<\/span>\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u3068\u3088\u3044\u3068\u304a\u4f1d\u3048\u3057\u307e\u3057\u305f\u304c\u3001\u540c\u3058\u3088\u3046\u306a\u8003\u3048\u65b9\u3067\u3059\u3002<\/p>\n<p>NullPointerException\u306e\u4e3b\u306a\u767a\u751f\u7406\u7531\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5143\u3067\u306e<span>null<\/span>\u30c1\u30a7\u30c3\u30af\u306e\u3057\u5fd8\u308c\u3060\u3063\u305f\u308a\u3057\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c\u53c2\u7167\u578b\u306a\u3089<span>null<\/span>\u3092<span>return<\/span>\u3067\u304d\u3001\u3053\u308c\u306f\u3054\u304f\u666e\u901a\u306e\u3053\u3068\u3067\u3059\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5143\u3067<span>null<\/span>\u306e\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u304f\u308c\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3067\u3082\u3001<span>Java<\/span>\u3067\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5143\u3078<span>null<\/span>\u30c1\u30a7\u30c3\u30af\u3092\u5f37\u5236\u3059\u308b\u3053\u3068\u304c\u3001\u6587\u6cd5\u4e0a\u3067\u51fa\u6765\u307e\u305b\u3093\u3002\u3067\u3059\u304b\u3089\u3001<span>Optional<\/span>\u3092\u4f7f\u3063\u3066\u672c\u5f53\u306e\u623b\u308a\u5024\u3092\u5305\u307f\u8fbc\u3093\u3067<span>return<\/span>\u3057\u3066\u3001\u672c\u5f53\u306e\u623b\u308a\u5024\u3092<span>Optional<\/span>\u304b\u3089\u53d6\u5f97\u3059\u308b\u6642\u306b<span>null<\/span>\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u3082\u3089\u3046\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Optional;\r\n\r\nclass ReturnSample {\r\n\t\/\/ null\u304b\u3082\u3057\u308c\u306a\u3044\u5024\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092Optional\u306b\u3057\u3066\u3001Optional\u3092return\u3059\u308b\r\n\tstatic Optional&lt;String&gt; getNullable() {\r\n\t\tString ret = null;\r\n\r\n\t\t\/\/ \u623b\u308a\u5024\u304cnull\u304b\u305d\u3046\u3067\u306a\u3044\u304b\u304c\u30e1\u30bd\u30c3\u30c9\u5185\u90e8\u306e\u51e6\u7406\u3067\u6c7a\u307e\u3063\u3066\u2026\r\n\r\n\t\treturn Optional.ofNullable(ret); \/\/ \u7d50\u679c\u3092Optional\u306b\u300c\u5305\u3093\u3067\u300dreturn\u3059\u308b\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ Optional\u3067\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u5024\u3092\u53d7\u3051\u53d6\u3063\u3066\u2026\r\n\t\tOptional&lt;String&gt; ret = getNullable();\r\n\r\n\t\t\/\/ \u5024\u304cnull\u3067\u306a\u3044\u306a\u3089print\u3059\u308b\u3002if\u6587\u3067\u306enull\u30c1\u30a7\u30c3\u30af\u304c\u4e0d\u8981!!\r\n\t\tret.ifPresent(System.out::println);\r\n\r\n\t\t\/\/ \u5024\u304cnull\u306e\u5834\u5408\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u6307\u5b9a\u3067\u304d\u308b\u3002\u3053\u3053\u3067\u3082if\u6587\u3067\u306enull\u30c1\u30a7\u30c3\u30af\u304c\u4e0d\u8981!!\r\n\t\tString str = ret.orElseGet(() -&gt; \"null\u307f\u305f\u3044\u3067\u3059\u3088?\");\r\n\t\tSystem.out.println(str);\r\n\t}\r\n}<\/pre>\n<p>\u8a73\u7d30\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<span style=\"text-decoration:none !important; background-color:#a61e58; color:white; padding:4px 13px; font-size:12px; font-weight:bold; position:relative; top:10px; z-index:1; left:11px;\">\u95a2\u9023\u8a18\u4e8b<\/span>\n<div class=\"blog-card\"><a target=\"_blank\" href=\"https:\/\/www.bold.ne.jp\/engineer-club\/java-optional\" style=\"text-decoration:none;\">\n    <div class=\"blog-card-thumbnail\"><img src='https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/shutterstock_568617811-600x366.jpg' alt='Java\u306eOptional\uff5cOptional\u306fnull\u304b\u3082\u3057\u308c\u306a\u3044\u3068\u4f1d\u3048\u308b\u3082\u306e' width=160 height=98 \/><\/div>\n    <div class=\"blog-card-content\">\n        <div class=\"blog-card-title\">Java\u306eOptional\uff5cOptional\u306fnull\u304b\u3082\u3057\u308c\u306a\u3044\u3068\u4f1d\u3048\u308b\u3082\u306e <\/div>\n        <span style=\"font-size: 12px; font-weight: normal; position:relative; color:#666;\"><i class=\"fa fa-clock-o\"><\/i>&nbsp;2025\/09\/17<\/span>\n    <\/div>\n<div class=\"clear\"><\/div>\n<\/a><\/div>\n<h2><span id=\"return-2\">\uff14\uff0e\u3010\u767a\u5c55\u3011<span>return<\/span>\u306e\u30b9\u30bf\u30a4\u30eb<\/span><\/h2>\n<p>return\u306e\u300c\u30b9\u30bf\u30a4\u30eb\u300d\u306f\u3044\u308d\u3044\u308d\u3042\u308a\u307e\u3059\u3002\u5927\u304d\u306a\u5206\u3051\u65b9\u3067\u306f\u3001<span>\u2460<\/span>\u30e1\u30bd\u30c3\u30c9\u306e\u9014\u4e2d\u3067\u5373\u5ea7\u306b<span>return<\/span>\u3059\u308b<span>(<\/span>\u65e9\u671f<span>return)<\/span>\u3001<span>\u2461<\/span>\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3084\u6c7a\u307e\u3063\u305f\u5834\u6240\u3060\u3051\u3067<span>return<\/span>\u3059\u308b<span>\u2026<\/span>\u306e\u4e8c\u3064\u3067\u3059\u3002\u5b9f\u969b\u306b\u306f<span>\u2460<\/span>\u3068<span>\u2461<\/span>\u306e\u6298\u8877\u6848\u306b\u306a\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u7c21\u5358\u306b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"-returnreturn\">\uff14-\uff11\uff0e\u3010\u304a\u52e7\u3081\u3011\u6761\u4ef6\u6b21\u7b2c\u3067\u5373<span>return<\/span>\u3059\u308b\u300c\u65e9\u671f<span>return<\/span>\u300d<\/span><\/h3>\n<h4>\uff14-\uff11-\uff11\uff0e\u65e9\u671f<span>return<\/span>\u306e\u7279\u5fb4<\/h4>\n<p>\u65e9\u671f<span>return(early returns)<\/span>\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u6027\u3084\u7406\u7531\u304c\u306a\u304f\u306a\u3063\u305f\u306a\u3089\u3001\u305d\u306e\u6642\u70b9\u3067\u3059\u3050<span>return<\/span>\u3059\u308b\u30b9\u30bf\u30a4\u30eb\u3067\u3059\u3002\u898b\u305f\u76ee\u4e0a\u306e\u7279\u5fb4\u306f\u3001<span>if<\/span>\u6587\u3067\u306e<span>else<\/span>\u304c\u5c11\u306a\u304f\u3001\u5404<span>if<\/span>\u6587\u306e\u6761\u4ef6\u304c\u6bd4\u8f03\u7684\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u4ee3\u8868\u7684\u306a\u9069\u7528\u5148\u306f\u5f15\u6570\u30c1\u30a7\u30c3\u30af\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u9650\u308a\u307e\u305b\u3093\u3002\u305d\u3057\u3066\u3001\u79c1\u306e\u304a\u52e7\u3081\u30b9\u30bf\u30a4\u30eb\u306f\u3053\u3061\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tint earlyReturn() {\r\n\t\tif (\u4f55\u304b\u306e\u6761\u4ef61) {\r\n\t\t\treturn 1; \/\/ \u6761\u4ef61\u3092\u6e80\u305f\u305b\u3070\u5373return\u3059\u308b\r\n\t\t}\r\n\r\n\t\tif (\u4f55\u304b\u306e\u6761\u4ef62) {\r\n\t\t\treturn 2; \/\/ \u6761\u4ef62\u3092\u6e80\u305f\u305b\u3070\u5373return\u3059\u308b\r\n\t\t}\r\n\r\n\t\tif (\u4f55\u304b\u306e\u6761\u4ef63) {\r\n\t\t\treturn 3; \/\/ \u6761\u4ef63\u3092\u6e80\u305f\u305b\u3070\u5373return\u3059\u308b\r\n\t\t}\r\n\r\n\t\treturn 0; \/\/ \u3059\u3079\u3066\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u304b\u3063\u305f\u5834\u5408\r\n\t}\r\n}<\/pre>\n<p>\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u306e\u5229\u70b9\u306f\u3001<span>if<\/span>\u6587\u306e\u69cb\u9020\u3084\u5224\u5b9a\u6761\u4ef6\u304c\u7c21\u5358\u306b\u306a\u308b\u3053\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u5185\u306e\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u304b\u306a\u308a\u6e1b\u308b\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u69cb\u9020\u304c\u7c21\u6f54\u306b\u306a\u308b\u306e\u3067\u3059\u3002\u3067\u3082\u3001\u3088\u304f\u3042\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4ed5\u69d8\u66f8\u306b\u3042\u308b\u6761\u4ef6\u3068\u306f\u3001\u51e6\u7406\u7d50\u679c\u306f\u540c\u3058\u3067\u3082\u9055\u3063\u305f\u5f62\u306b\u306a\u308b\u306e\u3067\u3001\u30bd\u30fc\u30b9\u30ec\u30d3\u30e5\u30fc\u6642\u306b\u4fee\u6b63\u6307\u793a\u304c\u51fa\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306d\u3002<\/p>\n<p>\u3053\u306e\u4f8b\u3060\u3068\u3001\u6761\u4ef6<span>2<\/span>\u306b\u51e6\u7406\u304c\u6765\u308b\u306e\u306f\u3001\u6761\u4ef6<span>1<\/span>\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u3060\u3051\u3067\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u6761\u4ef6<span>1<\/span>\u306e\u5f8c\u308d\u306f<span>if-else<\/span>\u306e<span>else<\/span>\u306e\u90e8\u5206\u3060\u3068\u3082\u8a00\u3048\u307e\u3059\u3002\u540c\u3058\u3088\u3046\u306b\u3001\u6761\u4ef6<span>3<\/span>\u306b\u51e6\u7406\u304c\u6765\u308b\u306e\u306f\u3001\u6761\u4ef6<span>1<\/span>\u3068\u6761\u4ef6<span>2<\/span>\u306e\u4e21\u65b9\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u3067\u3059\u3002\u9014\u4e2d\u306b<span>else<\/span>\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001<span>return<\/span>\u306b\u3088\u308a\u5b9f\u8cea\u7684\u306b\u540c\u3058\u3053\u3068\u3092\u8868\u73fe\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001\u65e9\u671f<span>return<\/span>\u3092\u7a4d\u6975\u7684\u306b\u4f7f\u3046\u30b9\u30bf\u30a4\u30eb\u306f\u3001\u76ee\u306b\u306f\u898b\u3048\u306a\u3044\u5927\u304d\u306a<span>if-else if<\/span>\uff5e\u3092\u3001\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u3067\u8868\u73fe\u3059\u308b\u30b9\u30bf\u30a4\u30eb\u3067\u3042\u308b<span>\u2026<\/span>\u3068\u3082\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h4>\uff14-\uff11-\uff12\uff0e\u65e9\u671f<span>return<\/span>\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u8aad\u3080\u306e\u306b\u5fc5\u8981\u306a\u3053\u3068\u3092\u5c11\u306a\u304f\u3059\u308b<\/h4>\n<p>\u65e9\u671f<span>return<\/span>\u306e\u3046\u308c\u3057\u3044\u70b9\u306f\u3001<span>return<\/span>\u3057\u305f\u5f8c\u308d\u3067\u306f<span>return<\/span>\u6e08\u307f\u306e\u6761\u4ef6\u3092\u8003\u3048\u306a\u304f\u3066\u3082\u3044\u3044\u3053\u3068\u3067\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u305f\u308a\u8aad\u3093\u3060\u308a\u3059\u308b\u4f5c\u696d\u306f\u3001\u4eee\u5b9a\u3084\u6761\u4ef6\u304c\u5c11\u306a\u304f\u306a\u308c\u3070\u306a\u308b\u307b\u3069\u3001\u3084\u308a\u3084\u3059\u304f\u306a\u308b\u3082\u306e\u3067\u3059\u3002\u65e9\u671f<span>return<\/span>\u3092\u3059\u308c\u3070\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u4e00\u5ea6\u306b\u899a\u3048\u305f\u308a\u8003\u3048\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u304c\u30b0\u30f3\u3068\u6e1b\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u30eb\u30fc\u30d7\u90e8\u5206\u3067\u306e<span>break<\/span>\u3084<span>continue<\/span>\u306b\u3082\u65e9\u671f<span>return<\/span>\u3068\u540c\u3058\u8003\u3048\u65b9\u304c\u3067\u304d\u307e\u3059\u3002\u65e9\u671f<span>break<\/span>\u3084\u65e9\u671f<span>continue<\/span>\u3068\u3044\u3046\u8a00\u8449\u306f\u805e\u3044\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u65e9\u671f<span>return<\/span>\u3068\u540c\u3058\u3088\u3046\u306b\u65e9\u3081\u306b<span>break<\/span>\u306a\u308a<span>continue<\/span>\u3092\u3059\u308c\u3070\u3001\u30eb\u30fc\u30d7\u90e8\u5206\u304c\u304b\u306a\u308a\u8aad\u307f\u3084\u3059\u304f\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"-return-6\">\uff14-\uff12\uff0e\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3084\u6c7a\u307e\u3063\u305f\u5834\u6240\u3060\u3051\u3067<span>return<\/span>\u3059\u308b<\/span><\/h3>\n<p>\u3082\u3046\u4e00\u3064\u306e<span>return<\/span>\u306e\u30b9\u30bf\u30a4\u30eb\u306f\u3001<span>return<\/span>\u3092\u3059\u308b\u7b87\u6240\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u9014\u4e2d\u306e\u6c7a\u307e\u3063\u305f\u7b87\u6240\u3060\u3051\u3068\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ReturnSample {\r\n\tint onlyOnceReturn() {\r\n\t\tint ret = 0; \/\/ \u623b\u308a\u5024\u306e\u5909\u6570\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3067\u521d\u671f\u5316\r\n\r\n\t\tif (\u4f55\u304b\u306e\u6761\u4ef61) {\r\n\t\t\tret = 1;\r\n\t\t} else if(\u4f55\u304b\u306e\u6761\u4ef62) {\r\n\t\t\tret = 2;\r\n\t\t} else if (\u4f55\u304b\u306e\u6761\u4ef63) {\r\n\t\t\tret = 3;\r\n\t\t}\r\n\r\n\t\treturn ret; \/\/ return\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3060\u3051\u3067\u3084\u308b\r\n\t}\r\n}<\/pre>\n<p>\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u3060\u3068\u3001\u3069\u3053\u304b\u3089\u5165\u3063\u3066\u3069\u3053\u304b\u3089\u51fa\u308b\u3001\u3068\u3044\u3046\u6d41\u308c\u304c\u5206\u304b\u308a\u3084\u3059\u304f\u306f\u306a\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u3001\u3088\u304f\u3042\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u8a2d\u8a08\u66f8\u306b\u66f8\u3044\u3066\u3042\u308b\u3088\u3046\u306a\u3001\u51e6\u7406\u5168\u4f53\u306e\u6d41\u308c\u3084\u3044\u308d\u3044\u308d\u306a\u6761\u4ef6\u3092\u7d20\u76f4\u306b\u4f5c\u308b\u3068\u3001\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u306b\u306a\u308b\u306e\u304c\u666e\u901a\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3067\u3059\u304c\u3001\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u306f\u5224\u5b9a\u6761\u4ef6\u304c\u8907\u96d1\u306b\u306a\u308a\u304c\u3061\u3067\u3001\u305d\u3046\u306a\u308b\u3068\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u306e\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u6df1\u304f\u306a\u308a\u3001\u898b\u901a\u3057\u304c\u60aa\u304f\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u4e00\u3064\u306e<span>if<\/span>\u306b\u5bfe\u5fdc\u3059\u308b<span>else-if<\/span>\u304c\u3001\u6570\u5341\u884c\uff5e\u6570\u767e\u884c\u3082\u5f8c\u308d\u306b\u3042\u308b<span>\u2026<\/span>\u306a\u3069\u3068\u3044\u3046\u3053\u3068\u3082\u3088\u304f\u8d77\u3053\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u5168\u3066\u306e\u6761\u4ef6\u3092\u7db2\u7f85\u3057\u305f\u3001\u3082\u306e\u3059\u3054\u304f\u8907\u96d1\u306a<span>if<\/span>\u6587\u306b\u3082\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n<p>\u305d\u3046\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u7406\u89e3\u3059\u308b\u306e\u306f\u304b\u306a\u308a\u5927\u5909\u3067\u3059\u3002\u306a\u305c\u304b\u3068\u8a00\u3046\u3068\u3001\u4eba\u9593\u304c\u4e00\u5ea6\u306b\u899a\u3048\u3066\u3044\u3089\u308c\u308b\u3053\u3068\u306f\u305b\u3044\u305c\u3044\u6570\u500b\u3060\u304b\u3089\u3067\u3059\u3002\u6975\u7aef\u306a\u8a71\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u5f8c\u3067\u3060\u3051\u3067<span>return<\/span>\u3092\u3059\u308b\u306a\u3089\u3001<span>return<\/span>\u76f4\u524d\u3067\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u5ba3\u8a00\u3057\u305f\u5168\u3066\u306e\u5909\u6570\u304c\u898b\u3048\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u3069\u3046\u3044\u3046\u72b6\u614b\u304b\u7406\u89e3\u3059\u308b\u306e\u306f\u3059\u3054\u304f\u5927\u5909\u3067\u3059\u3002<\/p>\n<h3><span id=\"-return-7\">\uff14-\uff13\uff0e\u3067\u304d\u308b\u7bc4\u56f2\u3067\u65e9\u671f<span>return<\/span>\u3092\u3057\u3088\u3046<span>!!<\/span><\/span><\/h3>\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u73fe\u5834\u3067\u306f\u3001\u7d50\u5c40\u306f\u3053\u306e\u4e8c\u3064\u306e\u30b9\u30bf\u30a4\u30eb\u304c\u6df7\u3056\u308b\u306e\u304c\u666e\u901a\u3067\u3059\u3002\u65e9\u671f<span>return<\/span>\u3092\u3059\u308b\u306a\u3089\u4ed5\u69d8\u66f8\u306a\u3069\u306b\u3042\u308b\u30ed\u30b8\u30c3\u30af\u3092\u89e3\u91c8\u3057\u3066\u3001\u540c\u3058\u52d5\u304d\u3092\u3059\u308b\u3088\u3046\u306b\u518d\u69cb\u6210\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u304c\u3001\u305d\u3053\u3067\u30df\u30b9\u3092\u3057\u306a\u3044\u3068\u3082\u9650\u308a\u307e\u305b\u3093\u3002\u65e9\u671f<span>return<\/span>\u3092\u610f\u8b58\u3057\u3066\u4ed5\u69d8\u3092\u66f8\u3044\u3066\u304f\u308c\u308b\u4eba\u306f\u5c11\u306a\u3044\u3067\u3057\u3087\u3046\u3057\u306d\u3002<\/p>\n<p>\u3067\u3059\u304c\u3001\u30c6\u30b9\u30c8\u99c6\u52d5\u958b\u767a\u306a\u3069\u306e\u300c\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3053\u3046\u52d5\u304f\u3079\u304d\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u4e8b\u524d\u306b\u660e\u78ba\u306b\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u306a\u3089\u3070\u3001\u5931\u6557\u3092\u6050\u308c\u308b\u3053\u3068\u306a\u304f\u3001\u7a4d\u6975\u7684\u306b\u65e9\u671f<span>return<\/span>\u3078\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u3066\u3082\u3089\u3044\u305f\u3044\u3067\u3059\u3002\u305d\u306e\u52b9\u679c\u3092\u5b9f\u4f53\u9a13\u3067\u304d\u305f\u306a\u3089\u30c1\u30fc\u30e0\u306e\u4e2d\u306b\u3082\u5e83\u3081\u3066\u3001\u8aad\u307f\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u30c1\u30fc\u30e0\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"i\">\uff15\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<span>Java<\/span>\u306e<span>return<\/span>\u306b\u3064\u3044\u3066\u304a\u4f1d\u3048\u3057\u3066\u304d\u307e\u3057\u305f\u3002<span>return<\/span>\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u7d42\u4e86\u3055\u305b\u308b\u3001\u305d\u3057\u3066\u623b\u308a\u5024\u3092\u623b\u3059\u3002<span>return<\/span>\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u4e0a\u3067\u306e\u57fa\u672c\u7684\u306a\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001<span>return<\/span>\u306e\u6b63\u3057\u3044\u7406\u89e3\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306f\u7d76\u5bfe\u306b\u6b20\u304b\u305b\u306a\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e2d\u3067<span>return<\/span>\u3092\u3069\u3046\u5b9f\u884c\u3059\u308b\u304b\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u306b\u3059\u3079\u3066\u4efb\u305b\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u65e9\u671f<span>return<\/span>\u306a\u3069\u306e\u5de5\u592b\u3092\u3059\u308b\u3068\u3001\u3088\u308a\u5206\u304b\u308a\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u4e00\u6b69\u8fd1\u3065\u3051\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3042\u306a\u305f\u3084\u5468\u56f2\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u4f5c\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001\u5206\u304b\u308a\u3084\u3059\u304f\u8aad\u307f\u3084\u3059\u3044\u3082\u306e\u3067\u3057\u3087\u3046\u304b<span>? <\/span>\u3082\u3057\u3001\u5c11\u3057\u3067\u3082\u8aad\u307f\u3065\u3089\u3044\u306a\u3041\u3068\u611f\u3058\u3066\u3044\u308b\u306a\u3089\u3001<span>return<\/span>\u306e\u4ed5\u65b9\u306b\u6ce8\u76ee\u3057\u3066\u307f\u308b\u3068\u3001\u3082\u3057\u304b\u3059\u308c\u3070\u89e3\u6c7a\u3078\u306e\u7cf8\u53e3\u304c\u3064\u304b\u3081\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3088\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306ereturn\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u3092\u7d42\u4e86\u3055\u305b\u3066\u547c\u3073\u51fa\u3057\u5143\u306b\u51e6\u7406\u3092\u623b\u3059\u6642\u3068\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u308a\u5024\u3092\u623b\u3059\u6642\u306b\u4f7f\u3046\u3082\u306e\u3067\u3059\u3002 \u3068\u3001\u3053\u306e\u3088\u3046\u306breturn\u306f\u5358\u7d14\u306a\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30de\u3092\u60d1\u308f\u305b\u307e\u3059\u3002\u7279\u306b\u3001try [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1426"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=1426"}],"version-history":[{"count":8,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1426\/revisions"}],"predecessor-version":[{"id":5780,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1426\/revisions\/5780"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=1426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=1426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}