{"id":1192,"date":"2018-12-21T12:00:24","date_gmt":"2018-12-21T03:00:24","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1192"},"modified":"2025-09-17T14:12:33","modified_gmt":"2025-09-17T05:12:33","slug":"java-boolean","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-boolean","title":{"rendered":"java\u306eboolean\u3068\u306f\uff1f\u6761\u4ef6\u5224\u65ad\u306b\u3074\u3063\u305f\u308a\u306a\u30c7\u30fc\u30bf\u578bboolean\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p><strong>Java\u306eboolean\u306f\u771f\u507d\u5024\u578b\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3001\u5024\u304ctrue\u304bfalse\u306e\u3069\u3061\u3089\u304b\u306b\u306a\u308b\u3082\u306e\u3067\u3059\u3002<\/strong><\/p>\n<p>boolean\u306b\u30d4\u30c3\u30bf\u30ea\u306a\u306e\u306f\u3001\u5909\u6570\u3067\u8868\u73fe\u3057\u305f\u3044\u3053\u3068\u304c\u767d\u9ed2\u306f\u3063\u304d\u308a\u3057\u3066\u3044\u3066\u3001\u3055\u3089\u306b\u533a\u5225\u304c\u4e8c\u7a2e\u985e\u3060\u3051\u3067\u3044\u3044\u5834\u5408\u3067\u3059\u3002<\/p>\n<p>boolean\u306f<span>Java<\/span>\u306e\u8272\u3005\u306a\u3068\u3053\u308d\u306b\u3088\u304f\u9854\u3092\u51fa\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070<span>if<\/span>\u6587\u3001<span>for<\/span>\u6587\u3001<span>while<\/span>\u6587\u306a\u3069\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u69cb\u6587\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306b\u3082\u3001<span>boolean<\/span>\u306e\u7406\u89e3\u306f\u3057\u3063\u304b\u308a\u3057\u3066\u304a\u304d\u305f\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306a<strong><\/strong><span class=\"f-marker-p\"><strong>boolean\u306e\u8003\u3048\u65b9\u3084\u5b9f\u969b\u306e\u4f7f\u3044\u65b9<\/strong><\/span>\u306b\u3064\u3044\u3066\u3001\u521d\u5fc3\u8005\u5411\u3051\u306b\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001<span>Java 10<\/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=\"#Javabooleantruefalse\">\uff11\uff0e\u3010Java\u3011boolean\u306ftrue\/false\u306e\u3069\u3061\u3089\u304b\u3060\u3051\u306b\u306a\u308b\u3082\u306e<\/a><\/li><li><a href=\"#Javaboolean\">\uff12\uff0e\u3010Java\u3011boolean\u3092\u4f7f\u3063\u3066\u307f\u3088\u3046!<\/a><ul><li><a href=\"#-boolean\">\uff12-\uff11\uff0eboolean\u578b\u5909\u6570\u306e\u5ba3\u8a00\u3001\u5024\u306e\u4ee3\u5165<\/a><\/li><li><a href=\"#-if\">\uff12-\uff12\uff0eif\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/a><\/li><li><a href=\"#-for\">\uff12-\uff13\uff0efor\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/a><\/li><li><a href=\"#-while\">\uff12-\uff14\uff0ewhile\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#Javaboolean-2\">\uff13\uff0e\u3010Java\u3011boolean\u306a\u5909\u6570\u30fb\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u540d\u524d\u304c\u4f55\u3088\u308a\u3082\u5927\u4e8b<\/a><ul><li><a href=\"#i\">\uff13-\uff11\uff0e\u5927\u4e08\u592b\u3067\u3059\u304b?<\/a><\/li><li><a href=\"#i-2\">\uff13-\uff12\uff0e\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304b?<\/a><\/li><li><a href=\"#-truefalse\">\uff13-\uff13\uff0e\u826f\u3044\u540d\u524d\u306ftrue\/false\u304c\u81ea\u7136\u306b\u7d10\u4ed8\u304f\u3082\u306e<\/a><\/li><\/ul><\/li><li><a href=\"#i-3\">\uff14\uff0e\u6700\u5f8c\u306b<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javabooleantruefalse\">\uff11\uff0e\u3010Java\u3011boolean\u306f<span>true\/false<\/span>\u306e\u3069\u3061\u3089\u304b\u3060\u3051\u306b\u306a\u308b\u3082\u306e<\/span><\/h2>\n<p>boolean(\u30d6\u30fc\u30ea\u30a2\u30f3<span>)<\/span>\u306f\u3001<span>true(<\/span>\u771f\u3001\u30c8\u30a5\u30eb\u30fc<span>)<\/span>\u304b<span>false(<\/span>\u507d\u3001\u30d5\u30a9\u30eb\u30b9\u3001\u30d5\u30a9\u30fc\u30eb\u30b9<span>)<\/span>\u306e\u3069\u3061\u3089\u304b\u3060\u3051\u306b\u306a\u308b\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b<span>(<\/span>\u57fa\u672c\u30c7\u30fc\u30bf\u578b<span>)<\/span>\u3067\u3059\u3002<\/p>\n<p>\u771f\u3068\u507d\u3060\u3068\u3001\u3069\u3046\u306b\u3082\u8a00\u8449\u304c\u5805\u82e6\u3057\u304f\u3066\u3068\u3063\u3064\u304d\u3065\u3089\u3044\u3067\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3092\u6301\u3063\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"attention a-1\">\n<ul>\n<li>true \u2192 \u80af\u5b9a\u7684\u306a\u610f\u5473\u5408\u3044\uff1a\u306f\u3044\u3001<span>OK<\/span>\u3001\u6709\u52b9\u3001\u6b63\u3057\u3044\u3001\u5b58\u5728\u3059\u308b\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3001\u8a31\u53ef\u3055\u308c\u305f\u3001\u542b\u3080\u3001\u8981\u6c42\u3055\u308c\u308b\u3001\u7d9a\u304f<\/li>\n<li>false \u2192 \u5426\u5b9a\u7684\u306a\u610f\u5473\u5408\u3044\uff1a\u3044\u3044\u3048\u3001<span>NG<\/span>\u3001\u7121\u52b9\u3001\u6b63\u3057\u304f\u306a\u3044\u3001\u5b58\u5728\u3057\u306a\u3044\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u3001\u8a31\u53ef\u3055\u308c\u306a\u3044\u3001\u542b\u307e\u306a\u3044\u3001\u8981\u6c42\u3055\u308c\u306a\u3044\u3001\u7d9a\u304b\u306a\u3044<\/li>\n<\/ul>\n<\/div>\n<h2><span id=\"Javaboolean\">\uff12\uff0e\u3010Java\u3011boolean\u3092\u4f7f\u3063\u3066\u307f\u3088\u3046<span>!<\/span><\/span><\/h2>\n<h3><span id=\"-boolean\">\uff12-\uff11\uff0eboolean\u578b\u5909\u6570\u306e\u5ba3\u8a00\u3001\u5024\u306e\u4ee3\u5165<\/span><\/h3>\n<p>boolean\u578b\u5909\u6570\u306e\u5ba3\u8a00\u306e\u4ed5\u65b9\u306f\u300c<span>boolean <\/span>\u5909\u6570\u540d\u300d\u3067\u3059\u3002<\/p>\n<p>\u521d\u671f\u5024\u306e\u8a2d\u5b9a\u65b9\u6cd5\u3084\u5024\u306e\u4ee3\u5165\u306e\u4ed5\u65b9\u3082<span>int<\/span>\u306a\u3069\u3068\u540c\u3058\u30eb\u30fc\u30eb\u3067\u3059\u304c\u3001\u5024\u306b\u306f<span>true<\/span>\u3068<span>false<\/span>\u306e\u3069\u3061\u3089\u304b\u3057\u304b\u53d6\u308c\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u5909\u6570\u306e\u5ba3\u8a00\u3068\u5024\u306e\u8a2d\u5b9a\u3092\u5225\u306b\u3059\u308b\u5834\u5408\r\nboolean b1;\r\nb1 = true;\r\n\r\n\/\/ \u5909\u6570\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5024\u306e\u8a2d\u5b9a\u3092\u540c\u6642\u306b\u3059\u308b\u5834\u5408\r\nboolean b2 = false;\r\n\r\n\/\/ boolean\u306b\u5024\u3092\u4ee3\u5165\u3057\u3066\u307f\u308b\r\nb1 = false;\r\nb2 = true;\r\n\r\n\/\/ boolean\u5909\u6570\u304b\u3089\u306e\u5024\u306e\u4ee3\u5165\u3082\u3067\u304d\u308b\r\nboolean b3 = b1; \/\/ \u2192 b3\u306ffalse\u306b\u306a\u308b\r\n\r\n\/\/ Java\u306eboolean\u306f\u6570\u5024\u3084\u6587\u5b57\u5217\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u305d\u308c\u3089\u3092\u4ee3\u5165\u3067\u304d\u306a\u3044\r\n\/\/ \u4ee5\u4e0b\u306f\u5168\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u306a\u308b\r\nboolean b4 = 0;\r\nboolean b5 = null;\r\nboolean b6 = \"\";\r\nboolean b7 = \"true\";<\/pre>\n<h3><span id=\"-if\">\uff12-\uff12\uff0eif\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/span><\/h3>\n<p>if\u6587\u306e\u6761\u4ef6\u5f0f\u306f\u3001<span>boolean<\/span>\u3060\u3051\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n<p>true\u3067\u3042\u308c\u3070\u305d\u306e\u30d6\u30ed\u30c3\u30af\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3001\u3069\u306e\u30d6\u30ed\u30c3\u30af\u3067\u3082\u6761\u4ef6\u304c\u5408\u308f\u306a\u3044\u5834\u5408\u306f\u3001<span>else<\/span>\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean b1 = true;\r\n\r\nif (b1) {\r\n\tSystem.out.println(\"true!\"); \/\/ \u2192 b1\u306ftrue\u306a\u306e\u3067\u3053\u3061\u3089\r\n} else {\r\n\tSystem.out.println(\"false!\");\r\n}\r\n\r\nboolean b2 = false;\r\n\r\nif (b2) {\r\n\tSystem.out.println(\"true!\");\r\n} else {\r\n\tSystem.out.println(\"false!\"); \/\/ \u2192 b2\u306ffalse\u306a\u306e\u3067\u3053\u3061\u3089\r\n}\r\n\r\nif (b1 &amp;&amp; b2) {\r\n\tSystem.out.println(\"true!\");\r\n} else {\r\n\tSystem.out.println(\"false!\"); \/\/ \u2192 true &amp;&amp; false\u306ffalse\u306b\u306a\u308b\u306e\u3067\u3001\u3053\u3061\u3089\r\n}<\/pre>\n<p>\u6700\u7d42\u7684\u306b<span>boolean<\/span>\u306b\u306a\u308b\u9593\u306b\u306f\u8272\u3005\u306a\u8a08\u7b97\u3084\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u304c\u3042\u3063\u3066\u3082\u3044\u3044\u306e\u3067\u3059\u304c\u3001\u7d50\u679c\u306f\u5fc5\u305a<span>boolean<\/span>\u3067\u306a\u3051\u308c\u3070\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff11\uff0e\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u4f7f\u3063\u3066\u307f\u308b<\/h4>\n<p>if\u6587\u306e\u7279\u6b8a\u306a\u5f62\u3068\u3057\u3066\u3001<span>if-else<\/span>\u3092\u4f7f\u3063\u305f\u5909\u6570\u8a2d\u5b9a\u306a\u3069\u3092<span>1<\/span>\u884c\u3067\u66f8\u3051\u308b\u3001\u4e09\u9805\u6f14\u7b97\u5b50<span>(?)<\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\u6761\u4ef6\u5f0f ? true\u306e\u6642\u306e\u5024 : false\u306e\u6642\u306e\u5024<\/pre>\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u300c<span>:<\/span>\u300d\u3067\u533a\u5207\u3089\u308c\u305f\u4e8c\u3064\u306e\u5024\u306e\u5185\u306e\u3069\u3061\u3089\u304b\u3092\u623b\u3057\u307e\u3059\u3002\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u6587\u3067\u306f\u306a\u304f\u6f14\u7b97\u5b50\u306a\u306e\u3067\u3001\u4f55\u304b\u306e\u5024\u3092\u623b\u3059\u306e\u3067\u3059\u3002<\/p>\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u6761\u4ef6\u5f0f\u3082\u3001<span>if<\/span>\u6587\u3068\u540c\u69d8\u306b<span>boolean<\/span>\u3060\u3051\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002\u6761\u4ef6\u5f0f\u304c<span>true<\/span>\u306b\u306a\u308b\u304b\u3067\u3001\u3069\u3061\u3089\u306e\u5024\u3092\u623b\u3059\u304b\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean b = true;\r\nString s = b ? \"\u771f\" : \"\u507d\"; \/\/ \u2192 s\u304c\u6307\u3059\u5148\u306eString\u306f\"\u771f\"\u306b\u306a\u308b\r\n\r\n\/\/ \u4e09\u9805\u6f14\u7b97\u5b50\u3067\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u4ee5\u4e0b\u306eif\u6587\u3068\u540c\u3058\r\nString s2;\r\nif (b) {\r\n\ts2 = \"\u771f\";\r\n} else {\r\n\ts2 = \"\u507d\";\r\n}<\/pre>\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u3001\u4f7f\u3046\u4eba\u306f\u300c\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u77ed\u304f\u306a\u308b\u300d\u300c\u5024\u306e\u6307\u5b9a\u6f0f\u308c\u304c\u306a\u3044\u300d\u306e\u3088\u3046\u306a\u7406\u7531\u3067\u3088\u304f\u4f7f\u3044\u307e\u3059\u3057\u3001\u4f7f\u308f\u306a\u3044\u4eba\u306f\u5168\u304f\u4f7f\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u3067\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u76ee\u306b\u3057\u305f\u6642\u306b\u3073\u3063\u304f\u308a\u3057\u306a\u3044\u3088\u3046\u3001\u3053\u3046\u3044\u3046\u3082\u306e\u304c\u3042\u308b\u3053\u3068\u306f\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3><span id=\"-for\">\uff12-\uff13\uff0efor\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/span><\/h3>\n<p>for\u6587\u306e\u6761\u4ef6\u5f0f\u3082<span>boolean<\/span>\u3060\u3051\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<span>true<\/span>\u306a\u3089<span>for<\/span>\u6587\u306e\u5185\u5bb9\u3092\u5b9f\u884c\u3057\u3001<span>false<\/span>\u306a\u3089\u5b9f\u884c\u3057\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean b = true;\r\n\r\nfor (int i = 0; b; i++) {\r\n\tSystem.out.println(i);\r\n\tif (i &gt; 5) {\r\n\t\tb = false;\r\n\t}\r\n}<\/pre>\n<p>\u3053\u306e<span>for<\/span>\u6587\u306f\u6761\u4ef6\u5f0f\u306b<span>boolean<\/span>\u306e\u5909\u6570\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5909\u6570\u306e\u5185\u5bb9\u304c<span>false<\/span>\u306b\u306a\u3063\u305f\u6642\u306b\u3001<span>for<\/span>\u6587\u304c\u7d42\u308f\u308a\u307e\u3059\u3002<\/p>\n<p>i\u304c<span>5<\/span>\u3092\u8d85\u3048\u305f\u6642<span>(6<\/span>\u4ee5\u4e0a<span>)<\/span>\u306b\u521d\u3081\u3066<span>false<\/span>\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001<span>0<\/span>\u3001<span>1<\/span>\u3001<span>2<\/span>\u3001<span>3<\/span>\u3001<span>4<\/span>\u3001<span>5<\/span>\u3001<span>6<\/span>\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3><span id=\"-while\">\uff12-\uff14\uff0ewhile\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u4f7f\u3063\u3066\u307f\u308b<\/span><\/h3>\n<p>while\u6587\u306e\u6761\u4ef6\u5f0f\u3082\u307e\u305f\u3001<span>boolean<\/span>\u3060\u3051\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<span>true<\/span>\u306a\u3089<span>for<\/span>\u6587\u306e\u5185\u5bb9\u3092\u5b9f\u884c\u3057\u3001<span>false<\/span>\u306a\u3089\u5b9f\u884c\u3057\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean b = true;\r\nint i = 0;\r\n\r\nwhile (b) {\r\n\tSystem.out.println(i);\r\n\tif (i &gt; 5) {\r\n\t\tb = false;\r\n\t}\r\n\ti++;\r\n}<\/pre>\n<p>\u3053\u306e<span>while<\/span>\u6587\u3082\u6761\u4ef6\u5f0f\u306b<span>boolean<\/span>\u306e\u5909\u6570\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5909\u6570\u306e\u5185\u5bb9\u304c<span>false<\/span>\u306b\u306a\u3063\u305f\u6642\u306b\u3001<span>while<\/span>\u6587\u304c\u7d42\u308f\u308a\u307e\u3059\u3002<\/p>\n<p>i\u304c<span>5<\/span>\u3092\u8d85\u3048\u305f\u6642<span>(6<\/span>\u4ee5\u4e0a<span>)<\/span>\u306b\u521d\u3081\u3066<span>false<\/span>\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001<span>0<\/span>\u3001<span>1<\/span>\u3001<span>2<\/span>\u3001<span>3<\/span>\u3001<span>4<\/span>\u3001<span>5<\/span>\u3001<span>6<\/span>\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2><span id=\"Javaboolean-2\">\uff13\uff0e\u3010Java\u3011boolean\u306a\u5909\u6570\u30fb\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u540d\u524d\u304c\u4f55\u3088\u308a\u3082\u5927\u4e8b<\/span><\/h2>\n<p>boolean\u306f<span>true<\/span>\u3068<span>false<\/span>\u306e\u4e8c\u7a2e\u985e\u306e\u6c7a\u307e\u3063\u305f\u5024\u3060\u3051\u3060\u304b\u3089\u3053\u305d\u3001\u5909\u6570\u540d\u3084\u30e1\u30bd\u30c3\u30c9\u540d\u306e\u4ed8\u3051\u65b9\u304c\u3068\u3066\u3082\u5927\u4e8b\u3067\u3059\u3002<\/p>\n<h3><span id=\"i\">\uff13-\uff11\uff0e\u5927\u4e08\u592b\u3067\u3059\u304b<span>?<\/span><\/span><\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u5927\u4e08\u592b\u304b\u3069\u3046\u304b\u8ab0\u304b\u306b\u805e\u304f\u6642\u3001\u666e\u901a\u306f\u300c\u5927\u4e08\u592b\u3067\u3059\u304b<span>?<\/span>\u300d\u3068\u805e\u304d\u307e\u3059\u3088\u306d\u3002<\/p>\n<p>\u305d\u3093\u306a\u554f\u3044\u639b\u3051\u306b\u300c\u306f\u3044\u300d\u3068\u300c\u3044\u3044\u3048\u300d\u3067\u7b54\u3048\u308b\u306a\u3089\u3001\u306f\u3044\u2192\u5927\u4e08\u592b\u3001\u3044\u3044\u3048\u2192\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u3001\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092<span>boolean<\/span>\u306b\u3059\u308b\u3068\u3001<span>ok<\/span>\u3068\u3044\u3046\u5909\u6570\u540d\u306b\u306a\u3063\u3066\u3001<span>true<\/span>\u2192\u306f\u3044\u2192\u5927\u4e08\u592b\u3001<span>false<\/span>\u2192\u3044\u3044\u3048\u2192\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u3001\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean ok = ....;\r\n\r\nif (ok) {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u3059\");\r\n} else {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n}<\/pre>\n<p>\u5426\u5b9a\u6f14\u7b97\u5b50<span>(!)<\/span>\u3067<span>boolean<\/span>\u306e\u610f\u5473\u3092\u9006\u306b\u3057\u3066\u3082\u4f1d\u308f\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u300c\u5927\u4e08\u592b\u3001\u3067\u306f\u306a\u3044\u300d\u3068\u3044\u3046\u3053\u3068\u3060\u3068\u3001\u898b\u308c\u3070\u308f\u304b\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean ok = ....;\r\n\r\nif (!ok) {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n} else {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u3059\");\r\n}<\/pre>\n<h3><span id=\"i-2\">\uff13-\uff12\uff0e\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304b<span>?<\/span><\/span><\/h3>\n<p>\u3067\u306f\u4eca\u5ea6\u306f\u300c\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304b<span>?<\/span>\u300d\u3068\u3044\u304d\u306a\u308a\u805e\u304b\u308c\u305f\u3089\u3001\u5c11\u3057\u7b54\u3048\u3092\u8003\u3048\u307e\u305b\u3093\u304b<span>?<\/span><\/p>\n<p>\u3053\u3061\u3089\u3082\u300c\u306f\u3044\u300d\u3068\u300c\u3044\u3044\u3048\u300d\u3067\u7b54\u3048\u308b\u306a\u3089\u3001\u5426\u5b9a\u306e\u8a00\u8449\u300c\u3067\u306f\u306a\u3044\u300d\u304c\u5165\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u610f\u5473\u304c\u3072\u3063\u304f\u308a\u8fd4\u3063\u3066\u3001\u306f\u3044\u2192\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u3001\u3044\u3044\u3048\u2192\u5927\u4e08\u592b\u3001\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3082<span>boolean<\/span>\u306b\u3059\u308b\u3068\u3001<span>notOk<\/span>\u3068\u3044\u3046\u5909\u6570\u540d\u306b\u306a\u3063\u3066\u3001<span>true<\/span>\u2192\u306f\u3044\u2192\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u3001<span>false<\/span>\u2192\u3044\u3044\u3048\u2192\u5927\u4e08\u592b\u3001\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean notOk = ....;\r\n\r\nif (notOk) {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n} else {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u3059\");\r\n}<\/pre>\n<p>\u5426\u5b9a\u6f14\u7b97\u5b50\u3067\u610f\u5473\u3092\u9006\u306b\u3059\u308b\u3068\u3001\u3053\u308c\u3082\u3061\u3087\u3063\u3068\u5206\u304b\u308a\u3065\u3089\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u300c\u5927\u4e08\u592b\u3067\u306f\u306a\u3044\u3001\u3067\u306f\u306a\u3044\u300d\u3068\u3044\u3046\u3088\u3046\u306b\u4e8c\u91cd\u306e\u5426\u5b9a\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean notOk = ....;\r\n\r\nif (!notOk) {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u3059\");\r\n} else {\r\n\tSystem.out.println(\"\u5927\u4e08\u592b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n}<\/pre>\n<p>\u3053\u3053\u3067\u554f\u984c\u306a\u306e\u306f\u3001\u666e\u901a\u306e\u4eba\u304c<span>true\/false<\/span>\u306b\u6301\u3063\u3066\u3044\u308b\u30a4\u30e1\u30fc\u30b8\u3068\u3001\u5909\u6570\u540d\u304b\u3089\u8aad\u307f\u53d6\u308c\u308b\u610f\u5473\u304c\u53cd\u5bfe\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>notOk\u3068\u3044\u3046\u5909\u6570\u540d\u306b\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30de\u3060\u3051\u306f\u3001\u5909\u6570\u306e\u610f\u56f3\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u306e\u3067\u5225\u306b\u56f0\u308a\u307e\u305b\u3093\u3002\u3067\u3082\u3001\u3053\u306e<span>ok<\/span>\u3068<span>notOk<\/span>\u304c\u4e00\u3064\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u4e2d\u306b\u6df7\u3056\u3063\u3066\u3044\u308b\u3068\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u6df7\u4e71\u3059\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3068\u601d\u3044\u307e\u305b\u3093\u304b<span>?<\/span><\/p>\n<h3><span id=\"-truefalse\">\uff13-\uff13\uff0e\u826f\u3044\u540d\u524d\u306f<span>true\/false<\/span>\u304c\u81ea\u7136\u306b\u7d10\u4ed8\u304f\u3082\u306e<\/span><\/h3>\n<p>boolean\u306e\u5909\u6570\u3084<span>boolean<\/span>\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u308b\u6642\u3001\u540d\u524d\u306e\u304a\u52e7\u3081\u306f\u3001\u540d\u524d\u3068<span>true\/false<\/span>\u304c\u81ea\u7136\u306b\u7d10\u4ed8\u304f\u3082\u306e\u3067\u3059\u3002\u5909\u6570\u3084<span>if<\/span>\u6587\u306a\u3069\u3092\u307e\u3068\u3081\u3066\u4e00\u3064\u306e\u82f1\u8a9e\u306e\u6587\u7ae0\u306b\u3057\u3066\u8aad\u3093\u3067\u307f\u3066\u3001\u3059\u3063\u2026\u3068\u81ea\u7136\u306b\u8aad\u3081\u308b\u3068\u30d9\u30b9\u30c8\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u30b3\u30c4\u306e\u4e00\u3064\u3068\u3057\u3066\u300c\u5927\u4e08\u592b\u3067\u3059\u304b<span>?<\/span>\u300d\u306e\u3088\u3046\u306b\u3001\u5426\u5b9a\u306e\u8a00\u8449\u3092\u5165\u308c\u306a\u3044\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u540d\u524d\u306b\u300c\u3067\u306f\u306a\u3044\u300d\u3068\u3044\u3046\u8a00\u8449\u3092\u542b\u3081\u306a\u3051\u308c\u3070\u3001<span>true\/false<\/span>\u3092\u305d\u306e\u307e\u307e\u81ea\u7136\u306b\u89e3\u91c8\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3001<span>Java<\/span>\u306e\u6a19\u6e96<span>API<\/span>\u306b\u3042\u308b<span>boolean<\/span>\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3082\u5426\u5b9a\u306e\u8a00\u8449\u306f\u5165\u3063\u3066\u3044\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001<span>isEmpty(<\/span>\u7a7a\u3063\u307d\u3060<span>)<\/span>\u3001<span>contains(<\/span>\u542b\u3080<span>)<\/span>\u3001<span>equals(<\/span>\u7b49\u3057\u3044<span>)<\/span>\u3001<span>matches(<\/span>\u4e00\u81f4\u3059\u308b<span>)<\/span>\u306e\u3088\u3046\u306b\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u540d\u306f<span>Java<\/span>\u306e\u6163\u7fd2\u3068\u3082\u8a00\u3048\u308b\u3082\u306e\u3067\u3059\u3002\u666e\u6bb5\u304b\u3089\u6163\u308c\u3066\u304a\u3044\u3066\u3001\u7a4d\u6975\u7684\u306b\u771f\u4f3c\u3059\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u7686\u304c\u8aad\u307f\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u305f\u3081\u306b\u306f\u3001\u3053\u3046\u3044\u3046\u6240\u306b\u3082\u6c17\u3092\u914d\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"i-3\">\uff14\uff0e\u6700\u5f8c\u306b<\/span><\/h2>\n<p>Java\u306e<span>boolean<\/span>\u306f\u3001<span>true<\/span>\u3068<span>false<\/span>\u306e\u3069\u3061\u3089\u304b\u306e\u5024\u3092\u53d6\u308b\u3082\u306e\u3067\u3059\u3002\u4f7f\u3044\u65b9\u306f\u4ed6\u306e\u6570\u5024\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3068\u307b\u3068\u3093\u3069\u5909\u308f\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>boolean\u306f\u3001<span>if<\/span>\u6587\u3001<span>for<\/span>\u6587\u3001<span>while<\/span>\u6587\u306e\u6761\u4ef6\u5f0f\u306b\u4f7f\u308f\u308c\u3001\u6761\u4ef6\u5f0f\u304c<span>true<\/span>\u3067\u3042\u308c\u3070\uff5e\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5171\u901a\u3057\u305f\u52d5\u304d\u3067\u3059\u3002<\/p>\n<p>boolean\u306e\u5909\u6570\u540d\u30fb\u30e1\u30bd\u30c3\u30c9\u540d\u3068\u3057\u3066\u826f\u3044\u3082\u306e\u306f\u3001<span>true<\/span>\u3068<span>false<\/span>\u304c\u3069\u3046\u3044\u3046\u72b6\u614b\u30fb\u610f\u5473\u3067\u3042\u308b\u304b\u3001\u8aad\u307f\u624b\u304c\u81ea\u7136\u306b\u5206\u304b\u308b\u3082\u306e\u3067\u3059\u3002\u305d\u3093\u306a\u5206\u304b\u308a\u3084\u3059\u3044<span>boolean<\/span>\u306e\u30b3\u30c4\u306e\u4e00\u3064\u306b\u306f\u3001\u540d\u524d\u306b\u5426\u5b9a\u306e\u8a00\u8449\u3092\u542b\u307e\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Java\u306e<span>boolean<\/span>\u3092\u6d3b\u7528\u3059\u308b\u306b\u306f\u3001<span>boolean<\/span>\u306e\u30af\u30e9\u30b9\u7248\u3067\u3042\u308b\u300c<span>Boolean<\/span>\u30af\u30e9\u30b9\u300d\u3082\u77e5\u3063\u3066\u304a\u304f\u3068\u5927\u5909\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u307f\u7d42\u308f\u3063\u305f\u5f8c\u306e\u6b21\u306e\u76ee\u6a19\u3068\u3057\u3066\u306f\u3001<span>Boolean<\/span>\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u5b66\u3076\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eboolean\u306f\u771f\u507d\u5024\u578b\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3001\u5024\u304ctrue\u304bfalse\u306e\u3069\u3061\u3089\u304b\u306b\u306a\u308b\u3082\u306e\u3067\u3059\u3002 boolean\u306b\u30d4\u30c3\u30bf\u30ea\u306a\u306e\u306f\u3001\u5909\u6570\u3067\u8868\u73fe\u3057\u305f\u3044\u3053\u3068\u304c\u767d\u9ed2\u306f\u3063\u304d\u308a\u3057\u3066\u3044\u3066\u3001\u3055\u3089\u306b\u533a\u5225\u304c\u4e8c\u7a2e\u985e\u3060\u3051\u3067\u3044\u3044\u5834\u5408\u3067\u3059\u3002  [&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\/1192"}],"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=1192"}],"version-history":[{"count":7,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1192\/revisions"}],"predecessor-version":[{"id":5725,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1192\/revisions\/5725"}],"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=1192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=1192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}