Java10\u306f\u305d\u306e23\u5e74\u306e\u6b74\u53f2\u306e\u4e2d\u3067\u6700\u3082\u901f\u3044\u30ea\u30ea\u30fc\u30b9\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java\u306f\u6210\u9577\u3068\u9032\u5316\u306e\u9045\u3055\u304c\u6279\u5224\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001Java10\u306f\u305d\u306e\u6982\u5ff5\u3092\u8986\u3057\u307e\u3057\u305f\u3002Java10\u306f\u591a\u304f\u306e\u672a\u6765\u5fd7\u5411\u306e\u5909\u66f4\u3092\u542b\u3080\u30ea\u30ea\u30fc\u30b9\u3067\u3042\u308a\u3001\u305d\u306e\u7bc4\u56f2\u3068\u5f71\u97ff\u306f\u660e\u767d\u3067\u306f\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u9060\u5927\u306a\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java10\u30ea\u30ea\u30fc\u30b9\u306b\u8ffd\u52a0\u3055\u308c\u305f\u3055\u307e\u3056\u307e\u306a\u6a5f\u80fd\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\u307e\u3059\u3002\u305d\u306e\u524d\u306b\u3001Java\u30ea\u30ea\u30fc\u30b9\u30e2\u30c7\u30eb\u306b\u5c0e\u5165\u3055\u308c\u305f\u3044\u304f\u3064\u304b\u306e\u5909\u66f4\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n
2017\u5e74\u304b\u3089\u3001\u30aa\u30e9\u30af\u30eb\u3068Java\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306fJava\u306e\u30ea\u30ea\u30fc\u30b9\u30b5\u30a4\u30af\u30eb\u30926\u30f6\u6708\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u3092\u767a\u8868\u3057\u307e\u3057\u305f\u3002\u30aa\u30e9\u30af\u30ebJava SE\u88fd\u54c1\u306f\u3001Long Term Support\uff08LTS\uff09\u30e2\u30c7\u30eb\u306b\u79fb\u884c\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3069\u3046\u3044\u3046\u610f\u5473\u3067\u3057\u3087\u3046\u304b\uff1fLTS\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u88fd\u54c1\u306f\u3001\u30aa\u30e9\u30af\u30eb\u304b\u3089\u512a\u308c\u305f\u30b5\u30dd\u30fc\u30c8\u3068\u6301\u7d9a\u7684\u306a\u30b5\u30dd\u30fc\u30c8\u3092\u63d0\u4f9b\u3055\u308c\u30013\u5e74\u3054\u3068\u306b\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3055\u308c\u307e\u3059\u3002\u5404Java\u30ea\u30ea\u30fc\u30b9\u306f\u30011\u3064\u307e\u305f\u306f2\u3064\u306e\u4e3b\u8981\u306a\u6a5f\u80fd\u306b\u57fa\u3065\u3044\u3066\u30e2\u30c7\u30eb\u5316\u3055\u308c\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u304c\u30ea\u30ea\u30fc\u30b9\u3092\u9032\u3081\u307e\u3059\u3002\u969c\u5bb3\u304c\u3042\u308b\u3068\u30ea\u30ea\u30fc\u30b9\u304c\u5ef6\u671f\u3055\u308c\u3001\u5e02\u5834\u6295\u5165\u304c\u9045\u308c\u307e\u3059\u3002Java 9\u306e\u4e3b\u8981\u306a\u6a5f\u80fd\u3067\u3042\u308bProject Jigsaw\u306f\u3001\u4f55\u5ea6\u304b\u30ea\u30ea\u30fc\u30b9\u65e5\u7a0b\u3092\u5ef6\u671f\u3057\u3001\u30ea\u30ea\u30fc\u30b9\u304c1.5\u5e74\u4ee5\u4e0a\u9045\u308c\u307e\u3057\u305f\u30026\u30f6\u6708\u30b5\u30a4\u30af\u30eb\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001\u30ea\u30ea\u30fc\u30b9\u30c8\u30ec\u30a4\u30f3\u306b\u5f93\u3044\u307e\u3059\u3002\u30ea\u30ea\u30fc\u30b9\u30c8\u30ec\u30a4\u30f3\u306f\u30016\u30f6\u6708\u3054\u3068\u306b\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u304c\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002\u9078\u3070\u308c\u305f\u6a5f\u80fd\u306f\u30c8\u30ec\u30a4\u30f3\u306b\u4e57\u308a\u307e\u3059\u304c\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u6b21\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3055\u308c\u305f\u30c8\u30ec\u30a4\u30f3\u307e\u3067\u5f85\u3064\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u4f7f\u3044\u3084\u3059\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u30aa\u30e9\u30af\u30eb\u3068Java\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306f\u3001\u4eca\u5f8c\u4e3b\u8981\u306aJDK\u3068\u3057\u3066OpenJDK\u30d0\u30a4\u30ca\u30ea\u3092\u63a8\u9032\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u4ee5\u524d\u306e\u72b6\u6cc1\u3068\u6bd4\u3079\u308b\u3068\u5927\u304d\u306a\u6551\u6e08\u3067\u3059\u3002\u4ee5\u524d\u306fJDK\u30d0\u30a4\u30ca\u30ea\u306f\u30aa\u30e9\u30af\u30eb\u304c\u6240\u6709\u6a29\u3092\u6301\u3061\u3001\u30e9\u30a4\u30bb\u30f3\u30b9\u5236\u7d04\u306b\u3088\u3063\u3066\u3055\u307e\u3056\u307e\u306a\u5236\u9650\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u30aa\u30e9\u30af\u30eb\u306f\u5f15\u304d\u7d9a\u304d\u81ea\u793e\u306eJDK\u3092\u958b\u767a\u3057\u7d9a\u3051\u308b\u4e88\u5b9a\u3067\u3059\u304c\u3001\u9577\u671f\u30b5\u30dd\u30fc\u30c8\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u307f\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30af\u30e9\u30a6\u30c9\u3084\u30b3\u30f3\u30c6\u30ca\u306b\u3082\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306e\u52d5\u304d\u3067\u3042\u308a\u3001\u30aa\u30fc\u30d7\u30f3\u306aJDK\u30d0\u30a4\u30ca\u30ea\u306f\u30b3\u30f3\u30c6\u30ca\u306e\u4e00\u90e8\u3068\u3057\u3066\u914d\u5e03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u306f\u3069\u3046\u3044\u3046\u610f\u5473\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f OpenJDK\u30d0\u30a4\u30ca\u30ea\u306f\u6bce6\u30f6\u6708\u3054\u3068\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3059\u304c\u3001Oracle JDK\u30d0\u30a4\u30ca\u30ea\u306f3\u5e74\u3054\u3068\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3059\uff08LTS\u30d0\u30fc\u30b8\u30e7\u30f3\uff09\u3002\u3069\u3061\u3089\u306eJDK\u30d0\u30a4\u30ca\u30ea\u304c\u63a1\u7528\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u5927\u304d\u306a\u7d44\u7e54\u306f\u30d0\u30fc\u30b8\u30e7\u30f3\u9593\u306e\u79fb\u884c\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u73fe\u5728\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3057\u304c\u307f\u3064\u304f\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Java 6\u306e\u696d\u754c\u63a1\u7528\u7387\u306fJava 7\u3088\u308a\u3082\u9ad8\u304f\u3001\u696d\u754c\u306f\u5f90\u3005\u306bJava 8\u306b\u79fb\u884c\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306e\u610f\u898b\u3067\u306f\u3001\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u306e\u9593\u3067\u306fLTS\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u6700\u3082\u597d\u307e\u308c\u308b\u3067\u3057\u3087\u3046\u3002\u305f\u3060\u3057\u3001Oracle JDK\u306eLTS\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u30aa\u30fc\u30d7\u30f3JDK\u306eLTS\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u306f\u307e\u3060\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u306f\u30af\u30e9\u30a6\u30c9\u306e\u9818\u57df\u3067\u591a\u304f\u306e\u4e8b\u304c\u9032\u884c\u4e2d\u3060\u304b\u3089\u3067\u3059\u3002Java 9\u306810\u306f\u975eLTS\u30ea\u30ea\u30fc\u30b9\u3067\u3059\u30022018\u5e749\u6708\u306b\u30ea\u30ea\u30fc\u30b9\u4e88\u5b9a\u306eJava 11\u306fLTS\u30ea\u30ea\u30fc\u30b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
Java 10\u306e\u5229\u7528\u53ef\u80fd\u306a\u6a5f\u80fd\u3092\u8997\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u6642\u9593\u30d9\u30fc\u30b9\u306e\u30ea\u30ea\u30fc\u30b9\u30b5\u30a4\u30af\u30eb\u306e\u63a1\u7528\u306b\u3088\u308a\u3001Oracle\u306fJava SE\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3068JDK\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u6587\u5b57\u5217\u30b9\u30ad\u30fc\u30e0\u3001\u304a\u3088\u3073\u95a2\u9023\u3059\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u60c5\u5831\u3092\u3001\u73fe\u5728\u304a\u3088\u3073\u5c06\u6765\u306e\u6642\u9593\u30d9\u30fc\u30b9\u306e\u30ea\u30ea\u30fc\u30b9\u30e2\u30c7\u30eb\u306b\u5bfe\u5fdc\u3059\u308b\u3088\u3046\u5909\u66f4\u3057\u307e\u3057\u305f\u3002\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u306e\u30d1\u30bf\u30fc\u30f3\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a$FEATURE.$INTERIM.$UPDATE.$PATCH\u3002$FEATURE\uff1a\u30ab\u30a6\u30f3\u30bf\u30fc\u306f6\u304b\u6708\u3054\u3068\u306b\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3055\u308c\u3001\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30ea\u30ea\u30fc\u30b9\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\uff08\u4f8b\uff1aJDK 10\u3001JDK 11\uff09\u3002$INTERIM\uff1a\u4e92\u63db\u6027\u306e\u3042\u308b\u30d0\u30b0\u4fee\u6b63\u304a\u3088\u3073\u6a5f\u80fd\u306e\u5f37\u5316\u3092\u542b\u3080\u975e\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30ea\u30ea\u30fc\u30b9\u306e\u305f\u3081\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u3067\u3059\u304c\u3001\u4e92\u63db\u6027\u306e\u306a\u3044\u5909\u66f4\u306f\u542b\u307e\u308c\u307e\u305b\u3093\u3002\u901a\u5e38\u3001\u3053\u308c\u306f\u30bc\u30ed\u306e\u307e\u307e\u3067\u3059\u30026\u304b\u6708\u9593\u306b\u4e2d\u9593\u30ea\u30ea\u30fc\u30b9\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u5c06\u6765\u306e\u30ea\u30ea\u30fc\u30b9\u30e2\u30c7\u30eb\u306e\u6539\u8a02\u306e\u305f\u3081\u306b\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002$UPDATE\uff1a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u554f\u984c\u3001\u30ea\u30b0\u30ec\u30c3\u30b7\u30e7\u30f3\u3001\u65b0\u6a5f\u80fd\u306e\u30d0\u30b0\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306e\u4e92\u63db\u6027\u306e\u3042\u308b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u30ea\u30ea\u30fc\u30b9\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u3067\u3059\u3002\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30ea\u30ea\u30fc\u30b9\u306e1\u304b\u6708\u5f8c\u304a\u3088\u3073\u305d\u306e\u5f8c3\u304b\u6708\u3054\u3068\u306b\u66f4\u65b0\u3055\u308c\u307e\u3059\u30022018\u5e744\u6708\u306e\u30ea\u30ea\u30fc\u30b9\u306fJDK 10.0.1\u3067\u3059\u30027\u6708\u306e\u30ea\u30ea\u30fc\u30b9\u306fJDK 10.0.2\u3067\u3059\u3002\u304a\u3088\u3073\u305d\u306e\u4ed6\u3002$PATCH\uff1a\u91cd\u5927\u306a\u554f\u984c\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306e\u7dca\u6025\u30ea\u30ea\u30fc\u30b9\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u5024\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u65b0\u3057\u3044API\u3082\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u3001\u8a73\u7d30\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
Version version = Runtime.version();\r\nversion.feature();\r\nversion.interim();\r\nversion.update();\r\nversion.patch();\r\n<\/code><\/pre>\n\u3055\u3042\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u60c5\u5831\u3092\u8fd4\u3059Java\u30e9\u30f3\u30c1\u30e3\u30fc\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
$ java -version\r\njava version \"10\" 2018-03-20\r\nJava(TM) SE Runtime Environment 18.3 (build 10+46)\r\nJava HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)\r\n<\/code><\/pre>\n\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u306e\u5f62\u5f0f\u306f\u300c10\u300d\u3067\u3042\u308a\u3001\u30bc\u30ed\u4ee5\u5916\u306e\u4ed6\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u30ea\u30ea\u30fc\u30b9\u65e5\u4ed8\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u300218.3\u306f\u300c2018\u5e743\u6708\u300d\u306e\u30d0\u30fc\u30b8\u30e7\u30f310\u306e46\u756a\u76ee\u306e\u30d3\u30eb\u30c9\u3068\u3057\u3066\u8aad\u307e\u308c\u307e\u3059\u3002\u4eee\u60f3\u7684\u306aJDK 10.0.1\u306e93\u756a\u76ee\u306e\u30d3\u30eb\u30c9\u306e\u5834\u5408\u3001\u30d3\u30eb\u30c9\u306f10.0.1+939\u3068\u306a\u308a\u307e\u3059\u3002### \u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u578b\u63a8\u8ad6\uff08JEP 286\uff09<\/p>\n
\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u578b\u63a8\u8ad6\u306f\u3001Java 10\u306e\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u6700\u3082\u5927\u304d\u306a\u65b0\u6a5f\u80fd\u3067\u3059\u3002\u521d\u671f\u5024\u3092\u6301\u3064\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u5ba3\u8a00\u306b\u578b\u63a8\u8ad6\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u578b\u63a8\u8ad6\u306f\u3001\u4ee5\u4e0b\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306e\u307f\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
\n- Limited only to Local Variable with initializer<\/li>\n
- Indexes of enhanced for loop or indexes<\/li>\n
- Local declared in for loop<\/li>\n<\/ul>\n
\u4f7f\u7528\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002 (Shiyou houhou o mitemimashou.)<\/p>\n
var numbers = List.of(1, 2, 3, 4, 5); \/\/ inferred value ArrayList<String>\r\n\/\/ Index of Enhanced For Loop\r\nfor (var number : numbers) {\r\n\tSystem.out.println(number);\r\n}\r\n\/\/ Local variable declared in a loop\r\nfor (var i = 0; i < numbers.size(); i++) {\r\n\tSystem.out.println(numbers.get(i));\r\n}\r\n<\/code><\/pre>\nJava 10\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u578b\u63a8\u8ad6\u306b\u95a2\u3059\u308b\u5f53\u793e\u72ec\u81ea\u306e\u6295\u7a3f\u3067\u3001\u3055\u3089\u306b\u8a73\u3057\u304f\u8aad\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001Java\u30d9\u30fc\u30b9\u306e\u5b9f\u9a13\u7684\u306aJIT\u30b3\u30f3\u30d1\u30a4\u30e9\uff08JEP 317\uff09\u306b\u3064\u3044\u3066\u3082\u8a73\u7d30\u3092\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001Java\u30d9\u30fc\u30b9\u306eJIT\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u3042\u308bGraal\u3092Linux\/x64\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4e0a\u3067\u5b9f\u9a13\u7684\u306aJIT\u30b3\u30f3\u30d1\u30a4\u30e9\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306fJava 10\u306e\u6a5f\u80fd\u30ea\u30b9\u30c8\u306b\u304a\u3044\u3066\u3001\u9593\u9055\u3044\u306a\u304f\u6700\u3082\u672a\u6765\u5fd7\u5411\u306e\u542b\u307f\u3067\u3042\u308a\u307e\u3059\u3002Graal\u306fJava 9\u3067\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u307e\u3067\u4f7f\u7528\u3057\u3066\u3044\u305fJIT\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u4ee3\u308f\u308a\u3068\u3057\u3066\u63d0\u4f9b\u3055\u308c\u308b\u3082\u306e\u3067\u3042\u308a\u3001JVM\u3078\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3059\u3002\u3064\u307e\u308a\u3001JIT\u30b3\u30f3\u30d1\u30a4\u30e9\u306fJVM\u306b\u4f9d\u5b58\u305b\u305a\u3001\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u306b\u30d7\u30e9\u30b0\u30a4\u30f3\u3068\u3057\u3066\u63a5\u7d9a\u304a\u3088\u3073\u4ed6\u306eJVMCI\u6e96\u62e0\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3068\u7f6e\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001Java\u306e\u4e16\u754c\u306bAhead of Time\uff08AOT\uff09\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u30dd\u30ea\u30b0\u30ed\u30c3\u30c8\u8a00\u8a9e\u306e\u89e3\u91c8\u3082\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u300cJava\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u30de\u30b7\u30f3\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306bJava\u3067\u66f8\u304b\u308c\u305fJust in Time\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u3059\u300d\u3068\u6df7\u4e71\u3057\u3066\u3044\u307e\u3059\u304b\uff1fJVM\u304cJava\u3067\u66f8\u304b\u308c\u3066\u3044\u308b\u306e\u3067\u3042\u308c\u3070\u3001JVM\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u306fJVM\u304c\u5fc5\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1fJVM\u306fAOT\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u3001JIT\u30b3\u30f3\u30d1\u30a4\u30e9\u306fJVM\u5185\u3067\u4f7f\u7528\u3055\u308c\u3001\u30e9\u30a4\u30d6\u30b3\u30fc\u30c9\u6700\u9069\u5316\u3092\u901a\u3058\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Graal\u306fJava\u3067\u5b8c\u5168\u306b\u30bc\u30ed\u304b\u3089JIT\u30b3\u30f3\u30d1\u30a4\u30e9\u3092\u66f8\u304d\u76f4\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u4ee5\u524d\u306eJIT\u30b3\u30f3\u30d1\u30a4\u30e9\u306fC++\u3067\u66f8\u304b\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3042\u3089\u3086\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u6700\u7d42\u7684\u306a\u9032\u5316\u6bb5\u968e\u306e1\u3064\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002Graal\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u6b21\u306eJVM\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\uff1a<\/p>\n
-XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler\r\n<\/code><\/pre>\n\u30af\u30ea\u30b9\u30fb\u30b7\u30fc\u30c8\u30f3\u306e\u30d7\u30ec\u30bc\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u304b\u3089Graal\u306b\u95a2\u3059\u308b\u8a73\u7d30\u3092\u5b66\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u300216\u756a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30af\u30e9\u30b9\u30c7\u30fc\u30bf\u5171\u6709\uff08JEP 310\uff09\u306b\u3064\u3044\u3066\u3002<\/p>\n
\u3053\u306e\u6a5f\u80fd\u306f\u3001\u30b9\u30bf\u30fc\u30c8\u30a2\u30c3\u30d7\u306e\u30d5\u30c3\u30c8\u30d7\u30ea\u30f3\u30c8\u3092\u6539\u5584\u3057\u3001\u65e2\u5b58\u306eClass-Data Sharing\uff08CDS\uff09\u6a5f\u80fd\u3092\u62e1\u5f35\u3057\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u5171\u6709\u30a2\u30fc\u30ab\u30a4\u30d6\u306b\u914d\u7f6e\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 JVM\u306f\u8d77\u52d5\u6642\u306b\u3044\u304f\u3064\u304b\u306e\u524d\u63d0\u3068\u3057\u3066\u3001\u30af\u30e9\u30b9\u3092\u30e1\u30e2\u30ea\u306b\u8aad\u307f\u8fbc\u3080\u3068\u3044\u3046\u624b\u9806\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u8907\u6570\u306e\u30af\u30e9\u30b9\u3092\u542b\u3080\u8907\u6570\u306ejar\u304c\u3042\u308b\u5834\u5408\u3001\u6700\u521d\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u9045\u5ef6\u304c\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30d6\u30fc\u30c8\u6642\u9593\u304c\u91cd\u8981\u306a\u30b5\u30fc\u30d0\u30fc\u30ec\u30b9\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3067\u306f\u554f\u984c\u306b\u306a\u308a\u307e\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8d77\u52d5\u6642\u9593\u3092\u77ed\u7e2e\u3059\u308b\u305f\u3081\u306b\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30af\u30e9\u30b9\u30c7\u30fc\u30bf\u5171\u6709\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30a2\u30a4\u30c7\u30a2\u306f\u3001\u7570\u306a\u308bJava\u30d7\u30ed\u30bb\u30b9\u9593\u3067\u4e00\u822c\u7684\u306a\u30af\u30e9\u30b9\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u5171\u6709\u3057\u3066\u30d5\u30c3\u30c8\u30d7\u30ea\u30f3\u30c8\u3092\u524a\u6e1b\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u306f\u6b21\u306e3\u3064\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\uff1a\u30a2\u30fc\u30ab\u30a4\u30d6\u3059\u308b\u30af\u30e9\u30b9\u306e\u6c7a\u5b9a\uff1a\u5171\u6709\u30a2\u30fc\u30ab\u30a4\u30d6\u306b\u542b\u3081\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u3001Java\u30e9\u30f3\u30c1\u30e3\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u6b21\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\uff1a<\/p>\n
$java -Xshare:off -XX:+UseAppCDS -XX:DumpLoadedClassList=hello.lst -cp hello.jar HelloWorld\r\n<\/code><\/pre>\n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3CDS\u7528\u306e\u30d5\u30a1\u30a4\u30eb\u30ea\u30b9\u30c8\u306e\u30a2\u30fc\u30ab\u30a4\u30d6\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u3001Java\u30e9\u30f3\u30c1\u30e3\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u6b21\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u5f93\u3063\u3066\u3001\u3053\u308c\u3092\u9054\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
$java -Xshare:dump -XX:+UseAppCDS -XX:SharedClassListFile=hello.lst -XX:SharedArchiveFile=hello.jsa -cp hello.jar\r\n<\/code><\/pre>\nAppCDS\u30a2\u30fc\u30ab\u30a4\u30d6\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6301\u3064Java\u30e9\u30f3\u30c1\u30e3\u30fc\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3CDS\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
$java -Xshare:on -XX:+UseAppCDS -XX:SharedArchiveFile=hello.jsa -cp hello.jar HelloWorld\r\n<\/code><\/pre>\nG1\u306e\u305f\u3081\u306e\u30d1\u30e9\u30ec\u30eb\u30d5\u30ebGC\uff08JEP 307\uff09<\/ol>\nJDK 9\u3067\u306f\u3001G1\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u306b\u306a\u308a\u307e\u3057\u305f\u3002G1\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u306f\u30d5\u30eb\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u56de\u907f\u3057\u307e\u3059\u304c\u3001\u53ce\u96c6\u306e\u305f\u3081\u306e\u4e26\u884c\u30b9\u30ec\u30c3\u30c9\u304c\u30e1\u30e2\u30ea\u3092\u5341\u5206\u306b\u7d20\u65e9\u304f\u5fa9\u6d3b\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u4f53\u9a13\u306b\u5f71\u97ff\u304c\u51fa\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u3001G1\u306e\u6700\u60aa\u306e\u9045\u5ef6\u304c\u6539\u5584\u3055\u308c\u3001\u30d5\u30eb\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u4e26\u5217\u306b\u884c\u308f\u308c\u307e\u3059\u3002G1\u30b3\u30ec\u30af\u30bf\u306e\u30de\u30fc\u30af-\u30b9\u30a4\u30fc\u30d7-\u30b3\u30f3\u30d1\u30af\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3053\u306e\u5909\u66f4\u306e\u4e00\u74b0\u3068\u3057\u3066\u4e26\u5217\u5316\u3055\u308c\u3001\u53ce\u96c6\u306e\u305f\u3081\u306e\u4e26\u884c\u30b9\u30ec\u30c3\u30c9\u304c\u30e1\u30e2\u30ea\u3092\u5341\u5206\u306b\u7d20\u65e9\u304f\u5fa9\u6d3b\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u307e\u3059\u300225. ### \u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\uff08JEP 304\uff09<\/p>\n
\u3053\u306eJEP\u306f\u5c06\u6765\u5fd7\u5411\u306e\u5909\u66f4\u3067\u3059\u3002\u5171\u901a\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u7570\u306a\u308b\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u306e\u30b3\u30fc\u30c9\u306e\u5206\u96e2\u3092\u6539\u5584\u3057\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u3001\u5185\u90e8GC\u30b3\u30fc\u30c9\u306b\u3088\u308a\u826f\u3044\u30e2\u30b8\u30e5\u30e9\u30ea\u30c6\u30a3\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u5909\u66f4\u305b\u305a\u306b\u65b0\u3057\u3044GC\u3092\u8ffd\u52a0\u3059\u308b\u969b\u306b\u5f79\u7acb\u3061\u3001\u4ee5\u524d\u306eGC\u306e\u524a\u9664\u307e\u305f\u306f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306b\u3082\u5f79\u7acb\u3061\u307e\u3059\u300226. \u8ffd\u52a0\u306eUnicode\u8a00\u8a9e\u30bf\u30b0\u62e1\u5f35(JEP 314)\u3002<\/p>\n
\u3053\u306e\u6a5f\u80fd\u306f\u3001java.util.Locale\u304a\u3088\u3073\u95a2\u9023\u3059\u308bAPI\u3092\u5f37\u5316\u3057\u3001BCP 47\u8a00\u8a9e\u30bf\u30b0\u306e\u8ffd\u52a0\u306eUnicode\u62e1\u5f35\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002Java SE 9\u3067\u306f\u3001\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308bBCP 47 U\u8a00\u8a9e\u30bf\u30b0\u306e\u62e1\u5f35\u306f\u300cca\u300d\u304a\u3088\u3073\u300cnu\u300d\u3067\u3059\u3002\u3053\u306eJEP\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u8ffd\u52a0\u306e\u62e1\u5f35\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/p>\n
\n- cu (currency type)<\/li>\n
- fw (first day of week)<\/li>\n
- rg (region override)<\/li>\n
- tz (time zone)<\/li>\n<\/ul>\n
\u3053\u308c\u3089\u306e\u8ffd\u52a0\u62e1\u5f35\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u3001\u69d8\u3005\u306aAPI\u306b\u5909\u66f4\u304c\u52a0\u3048\u3089\u308c\u3001U\u307e\u305f\u306f\u8ffd\u52a0\u62e1\u5f35\u306b\u57fa\u3065\u3044\u305f\u60c5\u5831\u304c\u63d0\u4f9b\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
java.text.DateFormat::get*Instance\r\njava.text.DateFormatSymbols::getInstance\r\njava.text.DecimalFormatSymbols::getInstance\r\njava.text.NumberFormat::get*Instance\r\njava.time.format.DateTimeFormatter::localizedBy\r\njava.time.format.DateTimeFormatterBuilder::getLocalizedDateTimePattern\r\njava.time.format.DecimalStyle::of\r\njava.time.temporal.WeekFields::of\r\njava.util.Calendar::{getFirstDayOfWeek,getMinimalDaysInWeek}\r\njava.util.Currency::getInstance\r\njava.util.Locale::getDisplayName\r\njava.util.spi.LocaleNameProvider\r\n<\/code><\/pre>\n\u30eb\u30fc\u30c8\u8a3c\u660e\u66f8\uff08JEP 319\uff09<\/ol>\nOpenJDK\u3092\u4fc3\u9032\u3057\u3001\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30e6\u30fc\u30b6\u30fc\u306b\u9b45\u529b\u7684\u306b\u3059\u308b\u305f\u3081\u3001\u3053\u306e\u6a5f\u80fd\u3067\u306fJDK\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4e00\u9023\u306e\u30eb\u30fc\u30c8\u8a3c\u660e\u66f8\u6a5f\u95a2\uff08CA\uff09\u8a3c\u660e\u66f8\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001Oracle\u3068OpenJDK\u306e\u30d0\u30a4\u30ca\u30ea\u306f\u6a5f\u80fd\u7684\u306b\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002TLS\u306a\u3069\u306e\u91cd\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001\u4eca\u5f8c\u306eOpenJDK\u30d3\u30eb\u30c9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u52d5\u4f5c\u3057\u307e\u3059\u3002JEP 312\u306e###\u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3082\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306e\u5185\u90e8\u306eJVM\u306e\u6a5f\u80fd\u3067\u3059\u3002\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u64cd\u4f5c\u306f\u3001\u5404Java\u30b9\u30ec\u30c3\u30c9\u304c\u30bb\u30fc\u30d5\u30dd\u30a4\u30f3\u30c8\u72b6\u614b\u306b\u3042\u308b\u9593\u306b\u5b9f\u884c\u3055\u308c\u308b\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u3059\u3002\u3053\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u3001\u30b9\u30ec\u30c3\u30c9\u81ea\u4f53\u307e\u305f\u306fVM\u30b9\u30ec\u30c3\u30c9\u306b\u3088\u3063\u3066\u3001\u30b9\u30ec\u30c3\u30c9\u3092\u30d6\u30ed\u30c3\u30af\u72b6\u614b\u306b\u3057\u305f\u307e\u307e\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306aVM\u30bb\u30fc\u30d5\u30dd\u30a4\u30f3\u30c8\u3092\u5b9f\u884c\u305b\u305a\u306b\u30b9\u30ec\u30c3\u30c9\u4e0a\u3067\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002\u500b\u3005\u306e\u30b9\u30ec\u30c3\u30c9\u3060\u3051\u3067\u306a\u304f\u3001\u5168\u3066\u306e\u30b9\u30ec\u30c3\u30c9\u307e\u305f\u306f\u3069\u308c\u3082\u884c\u308f\u306a\u3044\u3088\u3046\u306b\u3001\u500b\u5225\u306e\u30b9\u30ec\u30c3\u30c9\u3092\u505c\u6b62\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3042\u308a\u3001\u304b\u3064\u624b\u8efd\u306b\u884c\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u300231. ### \u4ee3\u66ff\u30e1\u30e2\u30ea\u30c7\u30d0\u30a4\u30b9\u4e0a\u306e\u30d2\u30fc\u30d7\u5272\u308a\u5f53\u3066\uff08JEP 316\uff09<\/p>\n
\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u30e1\u30e2\u30ea\u3092\u5927\u91cf\u306b\u6d88\u8cbb\u3057\u3001\u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u30a4\u30f3\u30e1\u30e2\u30ea\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5897\u52a0\u304c\u898b\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d3\u30b9\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306b\u3001\u3055\u307e\u3056\u307e\u306a\u30e1\u30e2\u30ea\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u304c\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001HotSpot VM\u306f\u30e6\u30fc\u30b6\u30fc\u304c\u6307\u5b9a\u3057\u305fNV-DIMM\u306a\u3069\u306e\u4ee3\u66ff\u30e1\u30e2\u30ea\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u3057\u3066\u3001Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d2\u30fc\u30d7\u306e\u5272\u308a\u5f53\u3066\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306eJEP\u306f\u3001DRAM\u3068\u540c\u3058\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\uff08\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u3092\u542b\u3080\uff09\u3092\u6301\u3064\u4ee3\u66ff\u30e1\u30e2\u30ea\u30c7\u30d0\u30a4\u30b9\u3092\u5bfe\u8c61\u3068\u3057\u3066\u304a\u308a\u3001\u65e2\u5b58\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306a\u304f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d2\u30fc\u30d7\u306eDRAM\u306e\u4ee3\u308f\u308a\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u300232. \u30cd\u30a4\u30c6\u30a3\u30d6\u30d8\u30c3\u30c0\u30b8\u30a7\u30cd\u30ec\u30fc\u30b7\u30e7\u30f3\u30c4\u30fc\u30eb\u3067\u3042\u308bjavah\u3092\u524a\u9664\u3057\u307e\u3059\uff08JEP 313\uff09\u3002<\/p>\n
\u3053\u308c\u306fJDK\u304b\u3089javah\u30c4\u30fc\u30eb\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306e\u5bb6\u653f\u512a\u308c\u305f\u5909\u66f4\u3067\u3059\u3002\u3053\u306e\u30c4\u30fc\u30eb\u306e\u6a5f\u80fd\u306f\u3001JDK 8\u306e\u4e00\u90e8\u3067\u3042\u308bjavac\u306b\u8ffd\u52a0\u3055\u308c\u3066\u304a\u308a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30cd\u30a4\u30c6\u30a3\u30d6\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\u80fd\u529b\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u305f\u3081\u3001javah\u306f\u4e0d\u8981\u306b\u306a\u308a\u307e\u3057\u305f\u3002 JDK Forest\u3092\u5358\u4e00\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u7d71\u5408\u3059\u308b JEP 296\u3092\u5b9f\u65bd\u3057\u307e\u3059\u3002<\/p>\n
\u6570\u5e74\u306b\u308f\u305f\u308a\u3001JDK\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u306b\u306f\u69d8\u3005\u306a\u30de\u30fc\u30ad\u30e5\u30ea\u30a2\u30eb\u30ea\u30dd\u30b8\u30c8\u30ea\u304c\u5b58\u5728\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u7570\u306a\u308b\u30ea\u30dd\u30b8\u30c8\u30ea\u306f\u4f55\u3089\u304b\u306e\u5229\u70b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3055\u307e\u3056\u307e\u306a\u904b\u7528\u4e0a\u306e\u4e0d\u90fd\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001JDK\u30d5\u30a9\u30ec\u30b9\u30c8\u306e\u591a\u304f\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u304c1\u3064\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u7d71\u5408\u3055\u308c\u3001\u958b\u767a\u3092\u7c21\u7d20\u5316\u3057\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u306e\u53d6\u308a\u7d44\u307f\u304c\u884c\u308f\u308c\u307e\u3057\u305f\u300236. ### API\u306e\u5909\u66f4<\/p>\n
Java 10\u3067\u306f\u3001API\u304c\u8ffd\u52a0\u3055\u308c\u305f\u308a\u524a\u9664\u3055\u308c\u305f\u308a\u3057\u307e\u3057\u305f\uff08\u30bf\u30a4\u30d7\u30df\u30b9\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff09\u3002Java 9\u3067\u306f\u3001\u5c06\u6765\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u524a\u9664\u3055\u308c\u308b\u4e88\u5b9a\u306e\u3042\u308b\u7279\u5b9a\u306eAPI\u306b\u6539\u826f\u304c\u52a0\u3048\u3089\u308c\u307e\u3057\u305f\u3002\u524a\u9664\u3055\u308c\u305fAPI\u306f\u3053\u3061\u3089\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u8ffd\u52a0\u3055\u308c\u305fAPI\u306f73\u500b\u3042\u308a\u3001Java 10\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u8ffd\u52a0\u3055\u308c\u305fAPI\u306f\u3001\u6bd4\u8f03\u3092\u542b\u3081\u3066\u3053\u3061\u3089\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306e\u8ffd\u52a0\u6a5f\u80fd\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n- List, Map & Set Interfaces are added with a static copyOf(Collection) method. Its returns an unmodifiable List, Map or Set containing the entries provided. For a List, if the given List is subsequently modified, the returned List will not reflect such modifications.<\/li>\n
- Optional & its primitive variations get a method orElseThrow(). This is exactly same as get(), however the java doc states that it is a preferred alternative then get()<\/li>\n
- Collectors class gets various methods for collecting unmodifiable collections (Set, List, Map)<\/li>\n<\/ul>\n
List<String> actors = new ArrayList<>();\r\nactors.add(\"Jack Nicholson\");\r\nactors.add(\"Marlon Brando\");\r\nSystem.out.println(actors); \/\/ prints [Jack Nicholson, Marlon Brando]\r\n\/\/ New API added - Creates an UnModifiable List from a List.\r\nList<String> copyOfActors = List.copyOf(actors);\r\nSystem.out.println(copyOfActors); \/\/ prints [Jack Nicholson, Marlon Brando]\r\n\/\/ copyOfActors.add(\"Robert De Niro\"); Will generate an\r\n\/\/ UnsupportedOperationException\r\nactors.add(\"Robert De Niro\");\r\nSystem.out.println(actors);\/\/ prints [Jack Nicholson, Marlon Brando, Robert De Niro]\r\nSystem.out.println(copyOfActors); \/\/ prints [Jack Nicholson, Marlon Brando]\r\n\t\t\r\nString str = \"\";\r\nOptional<String> name = Optional.ofNullable(str);\r\n\/\/ New API added - is preferred option then get() method\r\nname.orElseThrow(); \/\/ same as name.get() \r\n\r\n\/\/ New API added - Collectors.toUnmodifiableList\r\nList<String> collect = actors.stream().collect(Collectors.toUnmodifiableList());\r\n\/\/ collect.add(\"Tom Hanks\"); \/\/ Will generate an\r\n\/\/ UnsupportedOperationException\r\n<\/code><\/pre>\n\u7d50\u8ad6<\/h2>\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java 10\u306e\u7570\u306a\u308b\u65b0\u6a5f\u80fd\u306e\u8ffd\u52a0\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002\u3082\u3057\u5927\u5207\u306a\u60c5\u5831\u304c\u898b\u843d\u3068\u3055\u308c\u3066\u3044\u308b\u3068\u601d\u308f\u308c\u308b\u5834\u5408\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u3067\u304a\u77e5\u3089\u305b\u304f\u3060\u3055\u3044\u3002\u901a\u5e38\u901a\u308a\u3001\u3053\u3061\u3089\u304b\u3089GitHub\u3067\u5b8c\u5168\u306a\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java10\u306f\u305d\u306e23\u5e74\u306e\u6b74\u53f2\u306e\u4e2d\u3067\u6700\u3082\u901f\u3044\u30ea\u30ea\u30fc\u30b9\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java\u306f\u6210\u9577\u3068\u9032\u5316\u306e\u9045\u3055\u304c\u6279\u5224\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001Java10\u306f\u305d\u306e\u6982\u5ff5\u3092\u8986\u3057\u307e\u3057\u305f\u3002Java10\u306f\u591a\u304f\u306e\u672a\u6765\u5fd7\u5411\u306e\u5909\u66f4\u3092\u542b\u3080\u30ea\u30ea\u30fc\u30b9\u3067\u3042\u308a\u3001\u305d\u306e\u7bc4\u56f2\u3068 […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-849","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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