{"id":35260,"date":"2020-05-25T14:50:32","date_gmt":"2020-05-25T05:50:32","guid":{"rendered":"https:\/\/blog.jetbrains.com\/jp\/?p=3177"},"modified":"2020-05-25T14:50:32","modified_gmt":"2020-05-25T05:50:32","slug":"25-things-we-love-about-java","status":"publish","type":"post","link":"https:\/\/blog.jetbrains.com\/ja\/2020\/05\/25\/25-things-we-love-about-java\/","title":{"rendered":"Java\u3092\u611b\u3059\u308b25\u306e\u7406\u7531"},"content":{"rendered":"JetBrains \u306f\u3042\u3089\u3086\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3001\u3042\u3089\u3086\u308b\u7a2e\u985e\u306e\u958b\u767a\u8005\u3092\u611b\u3057\u3066\u3044\u307e\u3059\uff01 \u4eca\u6708 2020 \u5e74 5 \u6708\u306b Java \u306f 25 \u5468\u5e74\u3092\u8fce\u3048\u307e\u3057\u305f\uff01 \u305d\u306e\u305f\u3081\u3001\u79c1\u305f\u3061\u306f\u3053\u306e\u70b9\u306b\u7279\u5225\u306a\u6ce8\u610f\u3092\u6255\u3044\u3001Java \u3068 JVM 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\u306b\u4e57\u308a\u63db\u3048\u305f\u3053\u3068\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u3002\u7d44\u7e54\u5185\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u304c\u5927\u91cf\u306b\u5b58\u5728\u3057\u3066\u304a\u308a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5c02\u7528\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3092\u8cfc\u5165\u3059\u308b\u3053\u3068\u306a\u304f\u65b0\u3057\u3044 Java \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u305d\u308c\u3089\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3067\u5b9f\u884c\u3067\u304d\u308b\u3053\u3068\u304c\u958b\u767a\u74b0\u5883\u3092\u5168\u9762\u7684\u306b Java \u306b\u79fb\u884c\u3057\u305f\u4e3b\u306a\u7406\u7531\u306e\u4e00\u3064\u3060\u3063\u305f\u304b\u3089\u3067\u3059\u3002 \u73fe\u5728\u306e\u3088\u3046\u306a\u30af\u30e9\u30a6\u30c9\u306e\u6642\u4ee3\u3067\u306f\u3042\u307e\u308a\u95a2\u4fc2\u304c\u7121\u3044\u3088\u3046\u306b\u601d\u308f\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u79c1\u305f\u3061\u304c\u5e38\u306b WORA \u3092\u5b9f\u969b\u306b\u76ee\u306b\u3057\u3066\u3044\u306a\u3044\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u305d\u306e\u6069\u6075\u3092\u53d7\u3051\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002 \u305d\u3057\u3066\u3082\u3061\u308d\u3093\u3001IntelliJ IDEA\uff08\u307e\u305f\u306f NetBeans\uff09\u3092\u304a\u4f7f\u3044\u306e\u65b9\u306f\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u4e0a\u3067 WORA \u306e\u6069\u6075\u3092\u53d7\u3051\u3066\u3044\u307e\u3059\u3002\r\n\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\r\nJava \u3092\u3042\u307e\u308a\u77e5\u3089\u306a\u3044\u65b9\u306b\u306f\u9a5a\u304b\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u3001Java \u306f\u975e\u5e38\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u512a\u308c\u305f\u8a00\u8a9e\u3067\u3059\u3002 Java \u306f 25 \u5e74\u9593\u306b\u308f\u305f\u3063\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6539\u5584\u3057\u3066\u304d\u305f\u6210\u719f\u3057\u305f\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u6301\u3064\u591a\u6570\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u304c\u5099\u308f\u3063\u3066\u304a\u308a\u3001JVM \u306f\u307b\u3068\u3093\u3069\u306e\u4eba\u9593\u306e\u958b\u767a\u8005\u3088\u308a\u3082\u306f\u308b\u304b\u306b\u9069\u5207\u306b\u5b9f\u969b\u306e\u672c\u756a\u74b0\u5883\u3067\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u5408\u308f\u305b\u3066\u5b9f\u884c\u6642\u306b\u30b3\u30fc\u30c9\u3092\u6700\u9069\u5316\u3057\u307e\u3059\u3002 \u4f8b\u3048\u3070\u3001Java \u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u9045\u5ef6\u306e\u5c11\u306a\u3055\u3084\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4e88\u6e2c\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3042\u308b\u91d1\u878d\u696d\u754c\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\r\n\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\r\n\u8a71\u306f\u5909\u308f\u308a\u307e\u3059\u304c\u3001\u81ea\u52d5\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3082 25 \u5e74\u304c\u7d4c\u3063\u305f\u4eca\u3067\u306f\u4e00\u822c\u7684\u306b\u5f53\u305f\u308a\u524d\u3060\u3068\u601d\u308f\u308c\u3066\u3044\u307e\u3059\u3002 \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u306e\u30e1\u30e2\u30ea\u306e\u5272\u308a\u5f53\u3066\u65b9\u6cd5\u3084\u3001\u89e3\u653e\u65b9\u6cd5\u3092\u8003\u3048\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u5404 JVM \u306b\u306f 1 \u3064\u4ee5\u4e0a\u306e\u7570\u306a\u308b\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u79c1\u305f\u3061\u306f\u5185\u90e8\u306e\u6319\u52d5\u306b\u3042\u307e\u308a\u6ce8\u610f\u3092\u50be\u3051\u308b\u3053\u3068\u306a\u304f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u9069\u3057\u305f\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u9078\u629e\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\r\n\u53ef\u89b3\u6e2c\u6027\u3068\u7ba1\u7406\r\n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u52d5\u4f5c\u306b\u8208\u5473\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u975e\u5e38\u306b\u591a\u304f\u306e\u30c4\u30fc\u30eb\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u3053\u308c\u3089\u306e\u591a\u304f\u306f\u7121\u6599\u3067\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u7279\u306bJava Flight Recorder \u3068 Mission Control \u306f\u73fe\u5728\u3067\u306f OpenJDK\uff08Java 11 \u4ee5\u964d\uff09\u306e\u4e00\u90e8\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002 JMX \u306e\u3088\u3046\u306a\u30c4\u30fc\u30eb\u3067\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u52d5\u7684\u306b\u7ba1\u7406\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\r\nJava \u4eee\u60f3\u30de\u30b7\u30f3\uff08JVM\uff09\r\n\u524d\u8ff0\u306e\u6a5f\u80fd\u306e\u591a\u304f\u306f JVM \u306e\u6a5f\u80fd\u3067\u3059\u304c\u3001\u305d\u308c\u304c Java \u8a00\u8a9e\u305d\u306e\u3082\u306e\u3068\u306f\u5225\u3067\u3042\u308b\u3053\u3068\u306f\u660e\u78ba\u306b\u3057\u3066\u304a\u304b\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002 WORA\u3001\u5b9f\u884c\u6642\u306e\u6700\u9069\u5316\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30d9\u30f3\u30c0\u30fc\u306e\u9078\u629e\u306a\u3069\u3053\u308c\u307e\u3067\u306b\u53d6\u308a\u4e0a\u3052\u305f\u3082\u306e\u3082\u542b\u3081\u3001JVM \u3092\u611b\u7528\u3059\u308b\u7406\u7531\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u591a\u304f\u306f\u6a19\u6e96\u3084\u4ed5\u69d8\u304c\u3042\u308b\u304a\u304b\u3052\u3067\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002 JVM \u304c Java \u8a00\u8a9e\u305d\u306e\u3082\u306e\u3068\u5207\u308a\u96e2\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3082\u91cd\u8981\u3067\u3059\u3002\u305d\u308c\u306b\u3088\u308a\u3001\u3055\u307e\u3056\u307e\u306a\u8a00\u8a9e\u3092\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4e0a\u3067\u30d3\u30eb\u30c9\u3057\u3001\u524d\u8ff0\u3057\u305f JVM \u306e\u512a\u308c\u305f\u6a5f\u80fd\u3092\u3059\u3079\u3066\u5229\u7528\u3057\u306a\u304c\u3089\u3055\u307e\u3056\u307e\u306a\u69cb\u6587\u3068\u8a00\u8a9e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002\r\n\u305d\u306e\u4ed6\u306e JVM \u8a00\u8a9e\r\nJava \u304c Java 6 \u3068 Java 8 \u306e\u9593\u306e\u843d\u3061\u7740\u3044\u305f\u6570\u5e74\u9593\uff08Java 7 \u306b\u306f\u512a\u308c\u305f\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001Java \u958b\u767a\u8005\u306b\u3088\u3063\u3066\u306f\u91cd\u8981\u306a\u30ea\u30ea\u30fc\u30b9\u3068\u306f\u601d\u3048\u307e\u305b\u3093\u3067\u3057\u305f\uff09\u306b\u751f\u304d\u6b8b\u3063\u305f\u3001\u3042\u308b\u3044\u306f\u6210\u529f\u3057\u305f\u7406\u7531\u306e\u4e00\u3064\u306f\u3001\u4ed6\u306e JVM \u8a00\u8a9e\u3067\u3059\u3002 JetBrains \u3067\u611b\u7528\u3055\u308c\u3066\u3044\u308b\u306e\u306f\u5f53\u7136\u306a\u304c\u3089 Kotlin \u3067\u3059\u304c\u3001JVM \u306f Groovy\u3001Scala\u3001Clojure\u3001JRuby \u306e\u3088\u3046\u306a\u4ed6\u306e\u4eba\u6c17\u8a00\u8a9e\u7528\u3084\u975e\u5e38\u306b\u591a\u304f\u306e\u4ed6\u306e\u65b0\u3057\u3044\u8a00\u8a9e\u3084\u518d\u5b9f\u88c5\u3055\u308c\u305f\u8a00\u8a9e\u7528\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u3059\u3002 \u591a\u304f\u306e\u5834\u5408\u3001\u3053\u308c\u3089\u8a00\u8a9e\u3068\u5f93\u6765\u306e Java \u3068\u306e\u76f8\u4e92\u904b\u7528\u6027\u304c\u3053\u306e\u591a\u69d8\u6027\u3092\u53d7\u3051\u5165\u308c\u3066\u6d3b\u7528\u3059\u308b\u306e\u306b\u5f79\u7acb\u3063\u3066\u3044\u307e\u3059\u3002\r\n\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\r\n\u81a8\u5927\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u9078\u629e\u3067\u304d\u308b\u3053\u3068\u3082\u6ce8\u76ee\u305b\u3056\u308b\u3092\u5f97\u306a\u3044\u7406\u7531\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u591a\u304f\u306f\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u3067\u3042\u308a\u3001\u81ea\u7531\u306b\u5229\u7528\u3067\u304d\u307e\u3059\u3002 \u5177\u4f53\u7684\u306aSpring \u3084 Spring Boot \u306e\u3088\u3046\u306a\u4eba\u6c17\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5c0f\u898f\u6a21\u306a\u30b5\u30fc\u30d3\u30b9\u304b\u3089\u8907\u96d1\u306a\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u307e\u3067\u3042\u3089\u3086\u308b\u3082\u306e\u3092\u7c21\u5358\u306b\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u6a19\u6e96\u304c\u3042\u308c\u3070\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u4f3c\u305f\u3088\u3046\u306a\u3082\u306e\u3092\u5225\u306e\u72b6\u6cc1\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u7406\u89e3\u3057\u3066\u4f7f\u7528\u3059\u308b\u306e\u306f\u96e3\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002 Java \u304c\u6210\u719f\u3057\u3001\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306b\u3088\u3063\u3066\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u304c\u65e9\u671f\u63a1\u7528\u3055\u308c\u308b\u3053\u3068\u3067\u3001\u901a\u5e38\u306f\u6a19\u6e96\u7684\u306a\u554f\u984c\u306b\u5bfe\u3059\u308b\u65e2\u5b58\u306e\u89e3\u6c7a\u7b56\u304c\u5b58\u5728\u3057\u3001\u5206\u304b\u308a\u304d\u3063\u305f\u4e8b\u3092\u6700\u521d\u304b\u3089\u3084\u308a\u76f4\u3059\u5fc5\u8981\u304c\u306a\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002 \u307e\u305f\u3001\u3053\u306e\u3088\u3046\u306a\u89e3\u6c7a\u7b56\u306e\u591a\u304f\u306f\u9577\u671f\u9593\u306b\u308f\u305f\u3063\u3066\u5229\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u5341\u5206\u306b\u30c6\u30b9\u30c8\u304c\u884c\u308f\u308c\u3001\u7406\u89e3\u3055\u308c\u3001\u6587\u66f8\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002\r\n\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u3068\u4f9d\u5b58\u95a2\u4fc2\u306e\u7ba1\u7406\r\n\u7d4c\u9a13\u306b\u4e4f\u3057\u3044\u958b\u767a\u8005\u304c\u3001\u5b9f\u884c\u3057\u3088\u3046\u3068\u3059\u308b\u30b3\u30fc\u30c9\u304c\u660e\u3089\u304b\u306b\u5fc5\u8981\u3068\u3057\u3066\u3044\u308b\u30af\u30e9\u30b9\u3092\u542b\u3080\u4e0d\u660e\u306a JAR \u30d5\u30a1\u30a4\u30eb\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u691c\u7d22\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u305f\u6642\u4ee3\u306f\u3082\u3046\u904e\u53bb\u306e\u3082\u306e\u3068\u306a\u308a\u307e\u3057\u305f\u3002 \u7279\u306b Maven \u3068 Gradle \u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d3\u30eb\u30c9\u3068\u30c7\u30d7\u30ed\u30a4\u3092\u7c21\u5358\u306b\u3057\u305f\u3060\u3051\u3067\u306a\u304f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u5fc5\u8981\u306a\u3059\u3079\u3066\u306e\u4f9d\u5b58\u7269\u3068\u5171\u306b\u6a19\u6e96\u7684\u306a\u65b9\u6cd5\u3067\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002 \u305d\u306e\u305f\u3081\u3001\u65b0\u898f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u65e2\u5b58\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u7c21\u5358\u306b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u958b\u59cb\u3067\u304d\u307e\u3059\u3002 Maven Central \u3084 Bintray \u306e\u3088\u3046\u306a\u516c\u958b\u30ea\u30dd\u30b8\u30c8\u30ea\u306e\u304a\u304b\u3052\u3067\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u691c\u7d22\uff08\u3068\u516c\u958b\uff09\u3092\u5358\u7d14\u660e\u5feb\u306b\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\r\nJUnit \u3068\u81ea\u52d5\u5316\u30c6\u30b9\u30c8\r\nJUnit \u306f 1997 \u5e74\u306b\u4f5c\u6210\u3055\u308c\u307e\u3057\u305f\u3002\u3064\u307e\u308a\u3001Java \u3068\u307b\u307c\u540c\u3058\u304f\u3089\u3044\u53e4\u3044\u3082\u306e\u3067\u3059\uff01JUnit \u306f Java \u306e\u4e16\u754c\u3067\u3082\u5727\u5012\u7684\u306b\u6700\u3082\u4e00\u822c\u7684\u306a\u81ea\u52d5\u5316\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3042\u308a\u3001JUnit \u3068 TestNG \u306e\u4e21\u65b9\u304c IntelliJ IDEA \u306b\u540c\u68b1\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u306a\u305c\u306a\u3089\u3070\u3001\u3069\u3093\u306a\u65b0\u898f Java \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u5fc5\u8981\u306b\u306a\u308b\u3068\u8003\u3048\u3089\u308c\u305f\u305f\u3081\u3067\u3059\u3002 \u3042\u3089\u3086\u308b\u7a2e\u985e\u306e\u8a00\u8a9e\u7528\u306e\u6700\u65b0\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u3001\u73fe\u5728\u79c1\u305f\u3061\u304c JUnit \u3067\u306f\u5f53\u305f\u308a\u524d\u3060\u3068\u601d\u3063\u3066\u3044\u308b\u30a2\u30a4\u30c7\u30a2\u306b\u57fa\u3065\u3044\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3067\u3059\u3002 Java \u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306e\u81ea\u52d5\u5316\u30c6\u30b9\u30c8\u306e\u6587\u5316\u306f\u3001\u3053\u306e\u4e00\u3064\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u304b\u3089\u591a\u5927\u306a\u6069\u6075\u3092\u53d7\u3051\u3066\u3044\u307e\u3059\u3002\r\n\u5404\u7a2e IDE\r\n\u3053\u3053\u306f IntelliJ IDEA \u306e\u30d6\u30ed\u30b0\u3067\u3059\u306e\u3067\u3001IDE \u306b\u3064\u3044\u3066\u89e6\u308c\u308b\u306e\u3092\u5fd8\u308c\u308b\u308f\u3051\u306b\u306f\u3044\u304d\u307e\u305b\u3093\u3067\u3057\u305f\uff01 Java \u306e\u5197\u9577\u6027\u306b IDE \u304c\u5fc5\u8981\u3060\u3068\u8003\u3048\u3066\u3044\u308b\u65b9\u3067\u3042\u308c\u3001Java \u304c\u9759\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u3067\u3042\u308b\u305f\u3081\u306b\u5b9f\u969b\u306b IDE \u3092\u5927\u3044\u306b\u6d3b\u7528\u3067\u304d\u308b\u3068\u8003\u3048\u3066\u3044\u308b\u65b9\u3067\u3042\u308c\u3001Java \u958b\u767a\u8005\u306f\u5b9f\u969b\u306b IDE \u3092\u611b\u7528\u3057\u3066\u3044\u307e\u3059\uff08\u79c1\u305f\u3061\u3082\u958b\u767a\u8005\u3092\u611b\u3057\u3066\u3044\u307e\u3059\uff01\uff09\u3002 IDE \u3092\u52b9\u7387\u3088\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u7fd2\u3059\u308c\u3070\uff08IntelliJ IDEA\u3001Eclipse\u3001\u307e\u305f\u306f NetBeans \u306e\u3069\u308c\u3067\u3042\u3063\u3066\u3082\uff09\u3001\u30b3\u30fc\u30c9\u88dc\u5b8c\u3084\u30b3\u30fc\u30c9\u751f\u6210\u3001\u30c6\u30b9\u30c8\u306e\u5b9f\u884c\u3001\u30c7\u30d0\u30c3\u30b0\u3001\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u3001\u304a\u3088\u3073\u305d\u306e\u4ed6\u591a\u304f\u306e\u6a5f\u80fd\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u958b\u767a\u8005\u306e\u751f\u7523\u6027\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 Java \u958b\u767a\u8005\u306f\u901a\u5e38\u3001IDE \u304c\u3082\u305f\u3089\u3059\u30e1\u30ea\u30c3\u30c8\u306b\u975e\u5e38\u306b\u9ad8\u3044\u95a2\u5fc3\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\r\n\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\r\nJava 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\u306e\u4e16\u754c\u3067\u8a8d\u3081\u3089\u308c\u3066\u3044\u308b\u6280\u8853\u7684\u30ea\u30fc\u30c0\u30fc\u3067\u3059\u3002 Java \u306b\u306f OpenJDK \u3092\u4ecb\u3057\u305f JDK \u81ea\u4f53\u3082\u542b\u3081\u3001\u5927\u304d\u306a\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30fc\u304c\u5b58\u5728\u3057\u307e\u3059\u3002 Java \u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306f\u5b66\u7fd2\u3001\u6559\u80b2\u3001\u7d99\u7d9a\u7684\u306a\u6539\u5584\u3092\u91cd\u8996\u3057\u3066\u304a\u308a\u3001\u6a19\u6e96\u3068\u300c\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u300d\u306b\u95a2\u5fc3\u3092\u6301\u3061\u3001\u3053\u308c\u3089\u3092\u73fe\u5b9f\u4e16\u754c\u306e\u74b0\u5883\u306b\u9069\u7528\u3059\u308b\u65b9\u6cd5\u3092\u73fe\u5b9f\u7684\u306b\u8003\u3048\u3066\u3044\u307e\u3059\u3002\r\n\u4eba\r\n\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u3092\u69cb\u6210\u3057\u3066\u3044\u308b\u306e\u306f\u8a00\u3046\u307e\u3067\u3082\u306a\u304f\u4eba\u3067\u3059\u304c\u3001\u79c1\u304c\u958b\u767a\u8005\u306b Java \u306b\u95a2\u3057\u3066\u6700\u3082\u91cd\u8996\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u5c0b\u306d\u305f\u3068\u304d\u3001\u305d\u306e\u591a\u304f\u306f\u81ea\u5206\u305f\u3061\u306e\u5f37\u3044\u5f71\u97ff\u3092\u4e0e\u3048\u305f Java \u4e16\u754c\u306e\u4eba\u7269\u3067\u3042\u308b\u3068\u660e\u78ba\u306b\u56de\u7b54\u3057\u307e\u3057\u305f\u3002 \u3053\u306e\u3088\u3046\u306a\u4eba\u7269\u306f\u3001\u540c\u50da\u3084\u8b1b\u5e2b\u306e\u307b\u304b\u3001Brian Goetz\u3001Angie Jones\u3001Georges Saab\u3001Mala Gupta\u3001Venkat Subramaniam \u306e\u3088\u3046\u306a\u4eba\u7269\u307e\u3067\u591a\u5c90\u306b\u308f\u305f\u3063\u3066\u3044\u307e\u3059\u3002 \u4e2d\u306b\u306f\u79c1\u306e\u540d\u3092\u6319\u3052\u305f\u4eba\u3082\u3044\u307e\u3057\u305f\u3002 \u500b\u4eba\u7684\u306a\u3053\u3068\u3092\u8a00\u3048\u3070\u3001\u79c1\u304c Java \u306e\u4e16\u754c\u306b\u8db3\u3092\u8e0f\u307f\u5165\u308c\u305f\u306e\u306f Java \u3092\u5927\u5b66\u3067\u5b66\u3073\u3001\u4ed5\u4e8b\u304c\u305f\u304f\u3055\u3093\u3042\u3063\u305f\u304b\u3089\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u79c1\u306f\u3055\u307e\u3056\u307e\u306a\u4eba\u7269\u3084\u5f7c\u3089\u304b\u3089\u53d7\u3051\u305f\u652f\u63f4\u3084\u30b5\u30dd\u30fc\u30c8\u3092\u6c17\u306b\u5165\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306e\u4e16\u754c\u306b\u3068\u3069\u307e\u3063\u3066\u3044\u307e\u3059\u3002\r\nJavadoc \u3068\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\r\nJava \u306f Javadoc \u3092\u901a\u3058\u3066 API \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u540c\u8a00\u8a9e\u306e\u91cd\u8981\u90e8\u5206\u306b\u4f4d\u7f6e\u3065\u3051\u3066\u3044\u307e\u3059\u3002 3 \u7a2e\u985e\u306e\u30b3\u30e1\u30f3\u30c8\uff08Javadoc\u3001\u30d6\u30ed\u30c3\u30af\u30b3\u30e1\u30f3\u30c8\u3001\u884c\u30b3\u30e1\u30f3\u30c8\uff09\u306f\u3001\u958b\u767a\u8005\u304c\u6b8b\u3057\u3066\u3044\u308b\u30b3\u30e1\u30f3\u30c8\u306e\u7a2e\u985e\u3092\u660e\u78ba\u306b\u793a\u3057\u307e\u3059\u3002 Javadoc \u306f\u3001\u958b\u767a\u8005\u304c\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u308a\u3001\u30af\u30e9\u30b9\u3084\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u7528\u3057\u305f\u308a\u3059\u308b\u4ed6\u306e\u958b\u767a\u8005\u306b\u6709\u76ca\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u6b8b\u3059\u3053\u3068\u3092\u7279\u306b\u5968\u52b1\u3057\u3066\u3044\u307e\u3059\u3002 \u958b\u767a\u8005\u304c\u30e9\u30a4\u30d6\u30e9\u30ea\u3084\u30b3\u30fc\u30c9\u7247\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u60c5\u5831\u3092\u898b\u3064\u3051\u3089\u308c\u306a\u3044\u5834\u5408\u3001\u901a\u5e38\u306f\u6b63\u3057\u3044\u65b9\u5411\u306b\u5c0e\u3044\u3066\u304f\u308c\u308b Javadoc \u304c\u5b58\u5728\u3057\u307e\u3059\u3002\r\n\r\n\u307e\u305f\u3001Java \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306f\u4e00\u822c\u7684\u306b\u958b\u767a\u8005\u306b\u9ad8\u54c1\u8cea\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u671f\u5f85\u3057\u3066\u3044\u308b\uff08\u304a\u3088\u3073\u63d0\u4f9b\u3057\u3066\u3044\u308b\uff09\u3088\u3046\u3067\u3059\u3002 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30df\u30c3\u30c8\u8005\u306b\u306a\u308a\u305d\u3046\u306a\u65b9\u306f\u3001Javadoc \u30b3\u30e1\u30f3\u30c8\u3084\u305d\u306e\u4ed6\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u63d0\u51fa\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u4e16\u754c\u4e2d\u306e\u958b\u767a\u8005\u304c StackOverflow \u3067\u8cea\u7591\u5fdc\u7b54\u3092\u884c\u3063\u305f\u308a\u3001\u7279\u5b9a\u306e\u554f\u984c\u306e\u89e3\u6c7a\u7b56\u306b\u3064\u3044\u3066\u30d6\u30ed\u30b0\u3092\u57f7\u7b46\u3057\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u3002\r\n\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\r\nJava \u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306f\u65e9\u3044\u6bb5\u968e\u3067\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u3092\u53d6\u308a\u5165\u308c\u305f\u3060\u3051\u3067\u306a\u304f\u3001\u4eca\u3084 JDK \u81ea\u4f53\u3082 OpenJDK \u7d4c\u7531\u3067\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u5316\u306b\u3088\u3063\u3066\u8907\u6570\u306e\u30d9\u30f3\u30c0\u30fc\u306e\u307b\u304b\u3001\u500b\u4eba\u3082\u7c21\u5358\u306b\u95a2\u4e0e\u3057\u3066\u5354\u529b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002 Java \u81ea\u4f53\u306e\u30b3\u30fc\u30c9\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3082\u3001\u9b45\u529b\u7684\u3067\u3059\u3002 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u3001\u79c1\u305f\u3061\u306e\u3088\u3046\u306a\u958b\u767a\u8005\u304c\u3059\u3067\u306b\u8907\u96d1\u306a\u554f\u984c\u306b\u3064\u3044\u3066\u8003\u3048\u3001\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u5c3d\u529b\u3057\u305f\u4eba\u3005\u304b\u3089\u5b66\u7fd2\u3067\u304d\u308b\u7d20\u6674\u3089\u3057\u3044\u6a5f\u4f1a\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002\r\n\u7121\u6599\r\nJava \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u7528\u3055\u308c\u308b Java \u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3084\u591a\u304f\u306e\u4eba\u6c17\u30c4\u30fc\u30eb\u306f\u3001\u958b\u767a\u8005\u306b\u5bfe\u3057\u3066\uff08\u3042\u308b\u3044\u306f\u55b6\u5229\u7d44\u7e54\u306b\u5bfe\u3057\u3066\u3059\u3089\uff09\u5229\u7528\u6599\u91d1\u3092\u652f\u6255\u3046\u3053\u3068\u3092\u8981\u6c42\u3057\u3066\u3044\u307e\u305b\u3093\u3002 Oracle \u304c Java 11 \u3067\u30e9\u30a4\u30bb\u30f3\u30b9\u65b9\u5f0f\u3068\u30b5\u30dd\u30fc\u30c8\u3092\u5909\u66f4\u3057\u305f\u5f8c\u3067\u3055\u3048\u3001\u540c\u793e\uff08\u304a\u3088\u3073\u4ed6\u306e\u591a\u304f\u306e\u30d9\u30f3\u30c0\u30fc\uff09\u306f\u5f15\u304d\u7d9a\u304d\u7121\u6599\u3067\u540c\u8a00\u8a9e\u3092\u672c\u756a\u74b0\u5883\u3067\u5229\u7528\u3067\u304d\u308b\u624b\u6bb5\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3057\u305f\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u524d\u8ff0\u3057\u305f\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3001\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u3001\u5404\u7a2e IDE \u306f\u3059\u3079\u3066\u7121\u6599\u3067\u3042\u308b\u304b\u3001\u7121\u6599\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u3042\u308a\u307e\u3059\u3002 \u3053\u306e\u305f\u3081\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u59cb\u3081\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u958b\u767a\u8005\u3084\u3001\u4e88\u7b97\u3092\u6ce8\u8996\u3057\u306a\u304c\u3089\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u30d3\u30eb\u30c9\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u3042\u3089\u3086\u308b\u898f\u6a21\u306e\u7d44\u7e54\u306b\u3068\u3063\u3066\u3001Java \u306f\u9b45\u529b\u7684\u306b\u6620\u308a\u307e\u3059\u3002\r\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\r\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306f\u5f53\u7136\u306a\u304c\u3089\u552f\u4e00\u306e\u9078\u629e\u80a2\u3067\u306f\u306a\u304f\u3001\u3069\u3093\u306a\u30d1\u30e9\u30c0\u30a4\u30e0\u306b\u3082\u30e1\u30ea\u30c3\u30c8\u3068\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002 Java \u306f\u5f53\u521d\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3068\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306b\u5bfe\u5fdc\u3057\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3084\u305d\u306e\u4ed6\u306e\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306e\u591a\u304f\u306e\u4f8b\u304c Java \u3067\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001Java \u3092\u771f\u3063\u5148\u306b\u8a66\u3059\u3079\u304d\u3067\u3057\u3087\u3046\u3002\r\n\u9032\u5316\u3068\u9069\u5408\r\nJava \u306f\u304b\u3064\u3066\u3001\u305d\u3057\u3066\u4eca\u3082\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002 \u3057\u304b\u3057\u3001\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u3044\u304f\u3064\u304b\u306e\u6982\u5ff5\uff08\u30e9\u30e0\u30c0\u5f0f\u3001\u4e0d\u5909\u30c7\u30fc\u30bf\u69cb\u9020\u306a\u3069\uff09\u3092\u3046\u307e\u304f\u53d6\u308a\u5165\u308c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d1\u30e9\u30c0\u30a4\u30e0\u306e\u4e2d\u3067\u898b\u4e8b\u306b\u52d5\u4f5c\u3055\u305b\u3066\u3044\u307e\u3059\u3002 \u578b\u63a8\u8ad6\uff08var \u306a\u3069\uff09\u306b\u3088\u308a\u3001\u9759\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u306e\u30e1\u30ea\u30c3\u30c8\u3092\u5f15\u304d\u7d9a\u304d\u6d3b\u304b\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u306f\u5c11\u306a\u304f\u306a\u308a\u307e\u3059\u3002 \u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u30b5\u30a4\u30a8\u30f3\u30b9\u306f\u307e\u3060\u6bd4\u8f03\u7684\u82e5\u3044\u5206\u91ce\u3067\u3059\u304c\u3001\u305d\u308c\u3067\u3082\u79c1\u305f\u3061\u304c\u5b66\u7fd2\u3059\u308b\u5185\u5bb9\u306f\u65e2\u5b58\u306e\u30c4\u30fc\u30eb\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 Java\uff08\u8a00\u8a9e\u3068\u305d\u306e\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\uff09\u306f\u65b0\u3057\u3044\u30c8\u30ec\u30f3\u30c9\u3068\u65b0\u3057\u3044\u300c\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u300d\u306b\u5f93\u3044\u3001\u3055\u3089\u306b\u306f\u73fe\u5b9f\u4e16\u754c\u3067\u306e\u52d5\u304d\u3092\u78ba\u8a8d\u3057\u305f\u7d50\u679c\u3092\u53d7\u3051\u3066\u7d76\u3048\u9593\u306a\u304f\u6210\u9577\u3057\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002\r\n\r\nJava \u306f\u4ed6\u306e JVM \u8a00\u8a9e\u306e\u69cb\u6587\u3084\u30a2\u30a4\u30c7\u30a2\u3092\u5229\u7528\u3057\u3001\u5f93\u6765\u306e Java \u4e16\u754c\u306b\u4f55\u304c\u6a5f\u80fd\u3057\u3001\u4f55\u304c\u9069\u5408\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u304b\u3092\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002 JCP \u3084 OpenJDK \u3068\u3044\u3063\u305f\u3001Java \u304c\u9032\u5316\u3057\u3066\u6210\u9577\u3059\u308b\u306e\u306b\u4f7f\u7528\u3057\u3066\u3044\u308b\u30d7\u30ed\u30bb\u30b9\u3084\u30c4\u30fc\u30eb\u3067\u3055\u3048\u3082\u3001\u3053\u306e\u7d76\u3048\u9593\u306a\u3044\u9032\u5316\u306b\u5bfe\u5fdc\u3057\u7d9a\u3051\u3089\u308c\u308b\u3088\u3046\u306b\u81ea\u5206\u81ea\u8eab\u3092\u9069\u5408\u3055\u305b\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u9032\u5316\u3068\u9069\u5408\u306f\u3001Java \u304c\u614e\u91cd\u306b\u5bfe\u51e6\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u30d0\u30e9\u30f3\u30b9\u306e\u4e00\u3064\u3067\u3059\u3002\r\n\u53ef\u8aad\u6027\u3078\u306e\u6ce8\u529b\r\nJava \u306e\u30b3\u30fc\u30c9\u306f\u5f80\u3005\u306b\u3057\u3066 Java \u4ee5\u5916\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306b\u3082\u8aad\u307f\u3084\u3059\u3044\u3082\u306e\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u8a00\u8a9e\u306f\u7c21\u6f54\u3059\u304e\u305a\u3001\u5197\u9577\u306b\u66f8\u304b\u308c\u308b\u50be\u5411\u304c\u3042\u308b\u305f\u3081\u306b\u8aad\u307f\u3084\u3059\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u8a00\u8a9e\u306e\u958b\u767a\u8005\u306f\u3001\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u3088\u3046\u306a\u6a5f\u80fd\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3070\u3001\u4e88\u671f\u3057\u306a\u3044\u72ec\u81ea\u306e\u6319\u52d5\u306b\u72fc\u72fd\u3057\u306a\u3044\u3053\u3068\u304c\u91cd\u8981\u3060\u3068\u8003\u3048\u3089\u308c\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002 \u3053\u306e\u8a00\u8a9e\u3068\u5404\u7a2e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u306f\u300c\u9b54\u6cd5\u300d\u3092\u56de\u907f\u3059\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u90e8\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u958b\u767a\u8005\u304c\u7279\u306b\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u5fc5\u8981\u306a\u52d5\u4f5c\u3092\u884c\u3046 Convention over configuration\uff08\u300c\u8a2d\u5b9a\u3088\u308a\u898f\u7d04\u300d\uff09\u306e\u3088\u3046\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u63a1\u7528\u3057\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u78ba\u5b9f\u306b\uff08\u4f8b\u3048\u3070\uff09\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u30a2\u30b9\u30da\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u305f\u304f\u3055\u3093\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u3001\u3055\u3089\u306b\u306f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3084\u9759\u7684\u89e3\u6790\u30c1\u30a7\u30c3\u30af\u306b\u4f7f\u7528\u3059\u308b\u983b\u5ea6\u3082\u5c11\u306a\u304f\u306a\u308a\u307e\u3059\u3002 \u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306f\u6a19\u6e96\u3068\u300c\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u300d\u3092\u597d\u3080\u50be\u5411\u304c\u3042\u308b\u305f\u3081\u3001Java \u306e\u30b3\u30fc\u30c9\u306f\u307e\u3063\u305f\u304f\u7570\u306a\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3042\u3063\u3066\u3082\u5f80\u3005\u306b\u3057\u3066\u4f3c\u305f\u3088\u3046\u306a\u30eb\u30fc\u30eb\u306b\u5f93\u3063\u3066\u3044\u307e\u3059\u3002\r\n\u8a00\u8a9e\u6a5f\u80fd\r\n\u3053\u308c\u307e\u3067\u79c1\u305f\u3061\u304c Java \u306b\u3064\u3044\u3066\u6c17\u306b\u5165\u3063\u3066\u3044\u308b 23 \u306e\u9805\u76ee\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u6a5f\u80fd\u30ec\u30d9\u30eb\u3067\u306f\u4f55\u3082\u53d6\u308a\u4e0a\u3052\u3066\u3044\u307e\u305b\u3093\uff01 \u6b63\u76f4\u306b\u8a00\u3048\u3070\u300125 \u500b\u306e\u6a5f\u80fd\u306b\u7d5e\u308a\u8fbc\u3080\u306e\u306f\u975e\u5e38\u306b\u96e3\u3057\u304f\u611f\u3058\u3089\u308c\u305f\u304b\u3089\u3067\u3059\u3002\u307e\u305f\u3001\u79c1\u305f\u3061\u304c Java \u306b\u95a2\u3057\u3066\u6c17\u306b\u5165\u3063\u3066\u3044\u308b\u591a\u304f\u306e\u70b9\u304c\u5e38\u306b\u69cb\u6587\u3084\u6a5f\u80fd\u306b\u95a2\u3059\u308b\u3082\u306e\u3067\u3042\u308b\u3068\u306f\u9650\u3089\u306a\u3044\u305f\u3081\u3067\u3059\u3002 \u958b\u767a\u8005\u306e\u610f\u898b\u306b\u7167\u3089\u3057\u3001\u4e00\u90e8\u306e\u304a\u6c17\u306b\u5165\u308a\u6a5f\u80fd\u3092\u8b83\u3048\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\r\n\r\n\tCollections API\uff1a\u9577\u304d\u306b\u308f\u305f\u3063\u3066\u79c1\u305f\u3061\u306e\u5f79\u306b\u7acb\u3063\u3066\u3044\u307e\u3059\uff01\r\n\t\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7528\u306e\u4fbf\u5229\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\uff1a\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u975e\u5e38\u306b\u7c21\u5358\u306b\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\r\n\tStreams API\uff1aCollections API \u3092\u88dc\u5b8c\u3059\u308b\u975e\u5e38\u306b\u512a\u308c\u305f API \u3067\u3042\u308a\u3001Java 8 \u4ee5\u964d\u3082\u9032\u5316\u3057\u3066\u3044\u308b\u306e\u304c\u7d20\u6674\u3089\u3057\u3044\u3067\u3059\u3002 \u4e26\u5217\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u3088\u308a\u3001\u6700\u65b0\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3092\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u304c\u65b0\u3057\u304f\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\r\n\t\u30e9\u30e0\u30c0\u5f0f\uff1aStreams API \u3068\u4f75\u7528\u3059\u308b\u3068\u7279\u306b\u4fbf\u5229\u3067\u3059\u304c\u3001\u5358\u72ec\u3067\u5229\u7528\u3057\u3066\u3082\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002\r\n\tOptional\uff1a\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u6709\u52b9\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3055\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u8868\u73fe\u3059\u308b\u306e\u306b\u4fbf\u5229\u306a\u65b9\u6cd5\u3067\u3059\uff08\u307e\u305f\u3001NullPointerExceptions \u304b\u3089\u4fdd\u8b77\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u307e\u3059\uff01\uff09\u3002 Java 8 \u4ee5\u964d\u3067 Optional \u306b\u6539\u5584\u304c\u52a0\u3048\u3089\u308c\u308b\u305f\u3073\u306b\u672c\u5f53\u306b\u5b09\u3057\u304f\u306a\u308a\u307e\u3059\u3002\r\n\tjava.time\uff1a\u65e5\u4ed8\u3068\u6642\u523b\u3092\u51e6\u7406\u3059\u308b\u6700\u65b0\u306e API \u306f\u5f85\u3061\u671b\u307e\u308c\u3066\u3044\u305f\u6539\u5584\u5185\u5bb9\u3067\u3059\r\n\t\u30c1\u30a7\u30c3\u30af\u4f8b\u5916\uff1a\u4eba\u306f\u30c1\u30a7\u30c3\u30af\u4f8b\u5916\u6d3e\u3068\u30e9\u30f3\u30bf\u30a4\u30e0\u4f8b\u5916\u6d3e\u306b\u4e8c\u5206\u3055\u308c\u307e\u3059\u304c\u3001\u5c11\u306a\u304f\u3068\u3082\u30c1\u30a7\u30c3\u30af\u4f8b\u5916\u306f\u305d\u308c\u3092\u4f7f\u7528\u3057\u305f\u3044\u4eba\u306e\u305f\u3081\u306b\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002\r\n\t\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\uff1a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\uff08\u7279\u306b\uff09\u30b3\u30f3\u30d1\u30a4\u30e9\u30fc\u304c\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3001\u3042\u308b\u3044\u306f\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u4f55\u3089\u304b\u306e\u91cd\u52b4\u50cd\u3092\u884c\u3046\u305f\u3081\u306e\u30e1\u30e2\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\r\n\tJShell\uff1aJava \u3092 REPL \u3067\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\r\n\tvar\uff1a\u578b\u63a8\u8ad6\u306f\u59a5\u5f53\u306a\u4f7f\u3044\u65b9\u3092\u3059\u308c\u3070\u30b3\u30fc\u30c9\u306e\u30ce\u30a4\u30ba\u3092\u6e1b\u3089\u3059\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\r\n\t\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3068\u30e2\u30b8\u30e5\u30fc\u30eb\u6a5f\u80fd\uff1aJava \u306f\u3069\u306e\u30b3\u30fc\u30c9\u304c\u3069\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30af\u30e9\u30b9\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u304b\u3092\u7c21\u5358\u306b\uff08Java 9 \u4ee5\u964d\u306f\u3055\u3089\u306b\u7c21\u5358\u306b\uff09\u660e\u793a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\r\n\tswitch \u5f0f\uff1aswitch \u5f0f\u3092\u4f7f\u7528\u3057\u3066\u3082\u7f8e\u3057\u3055\u304c\u307b\u3068\u3093\u3069\u640d\u306a\u308f\u308c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\uff01\r\n\t\u4fbf\u5229\u306a NullPointerExceptions\uff1a\u512a\u308c\u305f NullPointerException \u304c\u6c17\u306b\u5165\u3089\u306a\u3044\u4eba\u306a\u3069\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f \u958b\u767a\u8005\u306f\u4f8b\u5916\u304b\u3089 null \u306e\u767a\u751f\u7b87\u6240\u306b\u95a2\u3059\u308b\u3088\u308a\u6709\u76ca\u306a\u60c5\u5831\u3092\u53d6\u5f97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\r\n\t\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\uff1a\u79c1\u305f\u3061\u306f\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u3092\u611b\u7528\u3057\u3066\u3044\u307e\u3059\uff01 \u307e\u305f\u3001Records\u3001instanceof \u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u3001\u30c6\u30ad\u30b9\u30c8\u30d6\u30ed\u30c3\u30af\u306b\u5927\u3044\u306b\u671f\u5f85\u3057\u3066\u3044\u307e\u3059\u3002\r\n\r\n\u4eca\u5f8c\u306e\u5c55\u671b\r\n\u73fe\u5728\u30016 \u30ab\u6708\u3054\u3068\u306b\u65b0\u6a5f\u80fd\u304c\u63d0\u4f9b\u3055\u308c\u3001\u6bce\u56de\u306e\u9577\u671f\u30b5\u30dd\u30fc\u30c8\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u901a\u5e38\u3001\u305d\u308c\u3092\u5229\u7528\u3057\u3066\u5b9f\u884c\u3057\u3066\u3044\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u7279\u306b\u5909\u66f4\u3092\u52a0\u3048\u306a\u304f\u3066\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002 Java 15\uff082020 \u5e74 9 \u6708\uff09\u3067\u306f\u3001Hidden\uff08\u975e\u8868\u793a\uff09\u30af\u30e9\u30b9\u3001\u30c6\u30ad\u30b9\u30c8\u30d6\u30ed\u30c3\u30af\uff08\u3082\u306f\u3084\u30d7\u30ec\u30d3\u30e5\u30fc\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff09\u3001Records \u306e\u6700\u65b0\u30d7\u30ec\u30d3\u30e5\u30fc\u3001instanceof \u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u3001Sealed\uff08\u30b7\u30fc\u30eb\uff09\u30af\u30e9\u30b9\u306e\u30d7\u30ec\u30d3\u30e5\u30fc\u304c\u5b9f\u88c5\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u3002\r\n\r\n\u307e\u305f\u3001\u5c06\u6765\u7684\u306b\u306fProject Loom \u306b\u3088\u308b\u4f7f\u3044\u3084\u3059\u304f\u3001\u8efd\u91cf\u306a\u4e26\u884c\u51e6\u7406\u3001Project Valhalla \u306e\u30a4\u30f3\u30e9\u30a4\u30f3\u578b\u3001\u30e9\u30e0\u30c0\u306e\u75d5\u8de1\u306e\u3088\u3046\u306aProject Amber \u304b\u3089\u306e\u3055\u3089\u306a\u308b\u8a00\u8a9e\u306e\u5909\u66f4\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u304c\u5916\u90e8 API \u306b\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u304f\u306a\u308b Project Panama\u3001Project Leydon \u306b\u3088\u308b\u8d77\u52d5\u6642\u9593\u306e\u77ed\u7e2e\u3001\u5404\u7a2e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u306b\u5bfe\u3059\u308b\u3055\u3089\u306a\u308b\u6539\u5584\u306a\u3069\u306e\u5b9f\u88c5\u3082\u671f\u5f85\u3057\u3066\u3044\u307e\u3059\u3002\r\n\r\nJava \u306b\u306f\u660e\u308b\u3044\u672a\u6765\u304c\u5f85\u3063\u3066\u3044\u307e\u3059\uff01\r\n\r\n[\u539f\u6587]\u00a0Original post\u00a0in English is written by\u00a0Trisha Gee","protected":false},"excerpt":{"rendered":"JetBrains \u306f\u3042\u3089\u3086\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3001\u3042\u3089\u3086\u308b\u7a2e\u985e\u306e\u958b\u767a\u8005\u3092\u611b\u3057\u3066\u3044\u307e\u3059\uff01 \u4eca\u6708 2020 \u5e74 5 \u6708\u306b Java \u306f 25 \u5468\u5e74\u3092\u8fce\u3048\u307e\u3057\u305f\uff01 \u305d\u306e\u305f\u3081\u3001\u79c1\u305f\u3061\u306f\u3053\u306e\u70b9\u306b\u7279\u5225\u306a\u6ce8\u610f\u3092\u6255\u3044\u3001Java \u3068 JVM \u306b\u3064\u3044\u3066\u79c1\u305f\u3061\u304c\u6c17\u306b\u5165\u3063\u3066\u3044\u308b 25 \u306e\u9805\u76ee\u3092\u795d\u3044\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u5f8c\u65b9\u4e92\u63db\u6027Java \u306f\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306e Java \u3067 25 \u5e74\u524d\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3067\u304d\u308b","protected":false},"author":{"name":"Elizaveta 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