{"id":850,"date":"2022-07-24T11:43:27","date_gmt":"2023-09-13T10:22:31","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java-8%e3%81%ae%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0-java%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0\/"},"modified":"2025-08-01T03:00:34","modified_gmt":"2025-07-31T18:00:34","slug":"java-8%e3%81%ae%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0-java%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-8%e3%81%ae%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0-java%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0\/","title":{"rendered":"Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0 – Java\u30b9\u30c8\u30ea\u30fc\u30e0"},"content":{"rendered":"

Java 8 Stream API\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3078\u3088\u3046\u3053\u305d\u3002\u904e\u53bb\u6570\u56de\u306eJava 8\u306e\u6295\u7a3f\u3067\u306f\u3001Java 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5909\u66f4\u3084\u95a2\u6570\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u30e9\u30e0\u30c0\u5f0f\u306b\u3064\u3044\u3066\u898b\u3066\u304d\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001Java 8\u3067\u5c0e\u5165\u3055\u308c\u305f\u4e3b\u8981\u306aAPI\u306e1\u3064\u3067\u3042\u308bJava Stream\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0<\/h2>\n
    \n
  1. \n
      Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068Java\u30b9\u30c8\u30ea\u30fc\u30e0<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u304a\u3051\u308b\u95a2\u6570\u7684\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/ol>\n<\/li>\n<\/ol>\n

              \u95a2\u6570\u3068\u30d0\u30a4\u95a2\u6570
              \n\u8ff0\u8a9e\u3068\u30d0\u30a4\u8ff0\u8a9e
              \n\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fc\u3068\u30d0\u30a4\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fc
              \n\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc<\/p>\n

              java.util.Optional
              \njava.util.Spliterator
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4e2d\u9593\u304a\u3088\u3073\u7d42\u7aef\u64cd\u4f5c
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30c3\u30c8\u64cd\u4f5c
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f8b<\/p>\n

              Java\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f5c\u6210
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u306b\u5909\u63db
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4e2d\u9593\u64cd\u4f5c
              \nJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7d42\u7aef\u64cd\u4f5c<\/p>\n

              Java 8\u30b9\u30c8\u30ea\u30fc\u30e0API\u306e\u5236\u9650<\/p>\n

              Java\u30b9\u30c8\u30ea\u30fc\u30e0<\/h3>\n

              Java Stream API\u306e\u4f8b\u3092\u8abf\u3079\u308b\u524d\u306b\u3001\u306a\u305c\u305d\u308c\u304c\u5fc5\u8981\u306a\u306e\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u6574\u6570\u306e\u30ea\u30b9\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3057\u300110\u3088\u308a\u5927\u304d\u3044\u6574\u6570\u306e\u5408\u8a08\u3092\u6c42\u3081\u305f\u3044\u3068\u3057\u307e\u3059\u3002Java 8\u3088\u308a\u524d\u306e\u5834\u5408\u3001\u305d\u308c\u3092\u884c\u3046\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

              private static int sumIterator(List<Integer> list) {\r\n\tIterator<Integer> it = list.iterator();\r\n\tint sum = 0;\r\n\twhile (it.hasNext()) {\r\n\t\tint num = it.next();\r\n\t\tif (num > 10) {\r\n\t\t\tsum += num;\r\n\t\t}\r\n\t}\r\n\treturn sum;\r\n}\r\n<\/code><\/pre>\n
              \u4e0a\u8a18\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u306f3\u3064\u306e\u4e3b\u8981\u306a\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002 (J\u014dki no apur\u014dchi ni wa mitsu no shuy\u014dna mondai ga arimasu.)<\/p>\n
                \n
              1. \n
                  \u79c1\u305f\u3061\u306f\u6574\u6570\u306e\u5408\u8a08\u3092\u77e5\u308a\u305f\u3044\u3060\u3051\u3067\u3059\u304c\u3001\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u65b9\u6cd5\u3082\u63d0\u4f9b\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u30ea\u30b9\u30c8\u4e0a\u3092\u7e70\u308a\u8fd4\u3059\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u51e6\u7406\u3057\u3066\u3044\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                   <\/p>\n
                    \n
                  1. \n
                      \u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u9806\u6b21\u7684\u306a\u3082\u306e\u3067\u3042\u308a\u3001\u7c21\u5358\u306b\u4e26\u884c\u3057\u3066\u884c\u3046\u65b9\u6cd5\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n
                       <\/p>\n
                        \u5358\u7d14\u306a\u30bf\u30b9\u30af\u3067\u3082\u591a\u304f\u306e\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/ol>\n
                        \u4e0a\u8a18\u306e\u3059\u3079\u3066\u306e\u4e0d\u5177\u5408\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u3001Java 8 Stream API\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002Java Stream API\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5185\u90e8\u53cd\u5fa9\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001Java\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u53cd\u5fa9\u3092\u5236\u5fa1\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3088\u308a\u512a\u308c\u3066\u3044\u307e\u3059\u3002\u5185\u90e8\u53cd\u5fa9\u306b\u306f\u3001\u30b7\u30fc\u30b1\u30f3\u30b7\u30e3\u30eb\u304a\u3088\u3073\u4e26\u5217\u5b9f\u884c\u3001\u6307\u5b9a\u3055\u308c\u305f\u6761\u4ef6\u306b\u57fa\u3065\u304f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3001\u30de\u30c3\u30d4\u30f3\u30b0\u306a\u3069\u306e\u3044\u304f\u3064\u304b\u306e\u6a5f\u80fd\u304c\u5099\u308f\u3063\u3066\u3044\u307e\u3059\u3002 Java 8 Stream API\u306e\u307b\u3068\u3093\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u5f15\u6570\u306f\u3001\u95a2\u6570\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u306e\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java Streams\u3092\u4f7f\u7528\u3057\u3066\u3001\u4e0a\u8a18\u306e\u30ed\u30b8\u30c3\u30af\u3092\u4e00\u884c\u306e\u6587\u3067\u3069\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                        private static int sumStream(List<Integer> list) {\r\n\treturn list.stream().filter(i -> i > 10).mapToInt(i -> i).sum();\r\n}\r\n<\/code><\/pre>\n
                        \u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001Java\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u53cd\u5fa9\u6226\u7565\u3001\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3001\u30de\u30c3\u30d4\u30f3\u30b0\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u304a\u308a\u3001\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305a\u6700\u521d\u306b\u3001Java 8 Stream API\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
                        \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068Java\u30b9\u30c8\u30ea\u30fc\u30e0<\/h3>\n
                        \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u5024\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306e\u30e1\u30e2\u30ea\u4e0a\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3042\u308a\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u3001\u3059\u3079\u3066\u306e\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u65b9\u3001Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u8a08\u7b97\u3055\u308c\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u3002Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u306a\u3044\u305f\u3081\u3001\u30bd\u30fc\u30b9\u30c7\u30fc\u30bf\u69cb\u9020\uff08\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\uff09\u4e0a\u3067\u64cd\u4f5c\u3092\u884c\u3044\u3001\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u751f\u6210\u3057\u3066\u7279\u5b9a\u306e\u64cd\u4f5c\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30ea\u30b9\u30c8\u304b\u3089\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3057\u3001\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u64cd\u4f5c\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u7528\u3057\u305f\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u975e\u5e38\u306b\u9069\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u3084\u3059\u304f\u77ed\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u539f\u5247\u306b\u3088\u308a\u3001\u3044\u304f\u3064\u304b\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u64cd\u4f5c\u3067\u9045\u5ef6\u30b7\u30fc\u30af\u304c\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3001\u30de\u30c3\u30d4\u30f3\u30b0\u3001\u91cd\u8907\u306e\u524a\u9664\u306a\u3069\u306f\u3001\u9045\u5ef6\u7684\u306b\u5b9f\u88c5\u3067\u304d\u3001\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u6700\u9069\u5316\u306e\u4f59\u5730\u304c\u3042\u308a\u307e\u3059\u3002Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u6d88\u8cbb\u53ef\u80fd\u306a\u306e\u3067\u3001\u5c06\u6765\u306e\u4f7f\u7528\u306e\u305f\u3081\u306b\u30b9\u30c8\u30ea\u30fc\u30e0\u3078\u306e\u53c2\u7167\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30c7\u30fc\u30bf\u304c\u5fc5\u8981\u3068\u3055\u308c\u308b\u305f\u3081\u3001\u540c\u3058\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u8907\u6570\u56de\u518d\u5229\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002Java 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u3001\u30b7\u30fc\u30b1\u30f3\u30b7\u30e3\u30eb\u51e6\u7406\u3068\u4e26\u5217\u51e6\u7406\u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u304a\u308a\u3001\u5927\u898f\u6a21\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5b9f\u73fe\u3059\u308b\u306e\u306b\u975e\u5e38\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0API\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u30af\u30e9\u30b9\u306f\u3059\u3079\u3066\u3001java.util.stream\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u3067int\u3084long\u306a\u3069\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u30c7\u30fc\u30bf\u578b\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3053\u308c\u3089\u306e\u64cd\u4f5c\u306b\u306f\u591a\u304f\u306e\u6642\u9593\u304c\u304b\u304b\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u305f\u3081\u306e\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u3067\u3042\u308bIntStream\u3001LongStream\u3001DoubleStream\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
                        Java 8 Stream\u306b\u304a\u3051\u308b\u6a5f\u80fd\u7684\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9<\/h3>\n
                        Java 8 Stream API \u30e1\u30bd\u30c3\u30c9\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
                          \n
                        1. \n
                            Function\u3068BiFunction: Function\u306f\u3001\u4e00\u3064\u306e\u30bf\u30a4\u30d7\u306e\u5f15\u6570\u3092\u53d7\u3051\u53d6\u308a\u3001\u5225\u306e\u30bf\u30a4\u30d7\u306e\u5f15\u6570\u3092\u8fd4\u3059\u95a2\u6570\u3092\u8868\u3057\u307e\u3059\u3002Function<T, R>\u306f\u3001T\u304c\u95a2\u6570\u306e\u5165\u529b\u306e\u30bf\u30a4\u30d7\u3067\u3042\u308a\u3001R\u304c\u95a2\u6570\u306e\u7d50\u679c\u306e\u30bf\u30a4\u30d7\u3067\u3042\u308b\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u5f62\u5f0f\u3067\u3059\u3002\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u51e6\u7406\u306b\u306f\u3001\u7279\u5b9a\u306eFunction\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059 – ToIntFunction\u3001ToLongFunction\u3001ToDoubleFunction\u3001ToIntBiFunction\u3001ToLongBiFunction\u3001ToDoubleBiFunction\u3001LongToIntFunction\u3001LongToDoubleFunction\u3001IntToLongFunction\u3001IntToDoubleFunction\u306a\u3069\u3067\u3059\u3002Function\u307e\u305f\u306f\u305d\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306e\u7279\u6b8a\u5316\u304c\u4f7f\u7528\u3055\u308c\u308bStream\u30e1\u30bd\u30c3\u30c9\u306e\u3044\u304f\u3064\u304b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/ol>\n<\/li>\n<\/ol>\n
                            Stream map(Function<? super T, ? extends R> mapper)
                            \nIntStream mapToInt(ToIntFunction<? super T> mapper) – long\u304a\u3088\u3073double\u3092\u8fd4\u3059\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u7279\u5316\u30b9\u30c8\u30ea\u30fc\u30e0\u3082\u540c\u69d8\u3067\u3059\u3002
                            \nIntStream flatMapToInt(Function<? super T, ? extends IntStream> mapper) – long\u304a\u3088\u3073double\u3082\u540c\u69d8\u3067\u3059
                            \n A[] toArray(IntFunction<A[]> generator)
                            \n U reduce(U identity, BiFunction<U, ? super T, U> accumulator, BinaryOperator combiner)<\/u><\/u><\/a><\/p>\n
                            Predicate\u3068BiPredicate: \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u30c6\u30b9\u30c8\u3055\u308c\u308b\u8ff0\u8a9e\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089\u8981\u7d20\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Function\u3068\u540c\u69d8\u306b\u3001int\u3001long\u3001double\u306e\u305f\u3081\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u5c02\u7528\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002Predicate\u307e\u305f\u306fBiPredicate\u306e\u7279\u6b8a\u5316\u304c\u4f7f\u7528\u3055\u308c\u308bStream\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u90e8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
                            Stream filter(Predicate<? super T> predicate)
                            \nboolean anyMatch(Predicate<? super T> predicate)
                            \nboolean allMatch(Predicate<? super T> predicate)
                            \nboolean noneMatch(Predicate<? super T> predicate)<\/p>\n
                            Consumer\u3068BiConsumer: \u3053\u308c\u306f\u3001\u5358\u4e00\u306e\u5165\u529b\u5f15\u6570\u3092\u53d7\u3051\u5165\u308c\u3001\u7d50\u679c\u3092\u8fd4\u3055\u306a\u3044\u64cd\u4f5c\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u4f55\u3089\u304b\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Consumer\u3001BiConsumer\u3001\u307e\u305f\u306f\u305d\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306e\u7279\u6b8a\u5316\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u4f7f\u7528\u3055\u308c\u308bJava 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u90e8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
                            Stream peek(Consumer<? super T> action)
                            \nvoid forEach(Consumer<? super T> action)
                            \nvoid forEachOrdered(Consumer<? super T> action)<\/p>\n
                            Supplier: Supplier\u306f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u3067\u65b0\u3057\u3044\u5024\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u64cd\u4f5c\u3092\u8868\u3057\u307e\u3059\u3002Supplier\u5f15\u6570\u3092\u53d6\u308bStream\u306e\u4e00\u90e8\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
                            public static Stream generate(Supplier s)
                            \nR collect(Supplier supplier,BiConsumer<R, ? super T> accumulator,BiConsumer<R, R> combiner)<\/p>\n
                            java.util.Optional\u306e\u65e5\u672c\u8a9e\u306e\u540c\u7fa9\u8a9e\u3092\u63d0\u4f9b\u3057\u307e\u3059\uff1a
                            \n– \u30aa\u30d7\u30b7\u30e7\u30f3\u578b
                            \n– \u30cc\u30eb\u5024\u3092\u8a31\u5bb9\u3059\u308b\u578b
                            \n– \u7a7a\u5024\u3092\u6271\u3046\u305f\u3081\u306e\u578b
                            \n– \u5b58\u5728\u3057\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u5024\u3092\u6271\u3046\u578b<\/h3>\n
                            Java Optional\u306f\u3001null\u3067\u306a\u3044\u5024\u3092\u542b\u3080\u304b\u3082\u3057\u308c\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u5024\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3001isPresent()\u306ftrue\u3092\u8fd4\u3057\u3001get()\u306f\u305d\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7d42\u7aef\u64cd\u4f5c\u306fOptional\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u3044\u304f\u3064\u304b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
                              \n
                            • Optional reduce(BinaryOperator accumulator)<\/li>\n
                            • Optional min(Comparator<? super T> comparator)<\/li>\n
                            • Optional max(Comparator<? super T> comparator)<\/li>\n
                            • Optional findFirst()<\/li>\n
                            • Optional findAny()<\/li>\n<\/ul>\n
                              java.util.Spliterator\u3092\u65e5\u672c\u8a9e\u3067\u8868\u73fe\u3059\u308b\u3068\u3001\u300c\u30b8\u30e3\u30d0\u30c9\u30c3\u30c8\u30e6\u30fc\u30c6\u30a3\u30eb\u30c9\u30c3\u30c8\u30b9\u30d7\u30ea\u30c3\u30bf\u30ec\u30fc\u30bf\u300d\u3068\u306a\u308a\u307e\u3059\u3002<\/h3>\n
                              Java 8\u306eStream API\u3067\u4e26\u5217\u5b9f\u884c\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u3001Spliterator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Spliterator\u306etrySplit\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5143\u306eSpliterator\u306e\u4e00\u90e8\u306e\u8981\u7d20\u3092\u7ba1\u7406\u3059\u308b\u65b0\u3057\u3044Spliterator\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
                              Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4e2d\u9593\u64cd\u4f5c\u3068\u7d42\u7aef\u64cd\u4f5c<\/h3>\n
                              \u65b0\u3057\u3044Stream\u3092\u8fd4\u3059Java Stream API\u306e\u64cd\u4f5c\u306f\u3001\u4e2d\u9593\u64cd\u4f5c\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u64cd\u4f5c\u306e\u307b\u3068\u3093\u3069\u306f\u9045\u5ef6\u8a55\u4fa1\u3067\u3042\u308a\u3001\u65b0\u3057\u3044\u30b9\u30c8\u30ea\u30fc\u30e0\u8981\u7d20\u3092\u751f\u6210\u3057\u3001\u6b21\u306e\u64cd\u4f5c\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002\u4e2d\u9593\u64cd\u4f5c\u306f\u6700\u7d42\u7684\u306a\u7d50\u679c\u3092\u751f\u6210\u3059\u308b\u64cd\u4f5c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u4e2d\u9593\u64cd\u4f5c\u306f\u3001filter\u3084map\u3067\u3059\u3002Java 8 Stream API\u306e\u64cd\u4f5c\u306f\u3001\u7d50\u679c\u3092\u8fd4\u3059\u304b\u526f\u4f5c\u7528\u3092\u751f\u6210\u3059\u308b\u64cd\u4f5c\u3067\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u5bfe\u3057\u3066\u7d42\u7aef\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u3068\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u6d88\u8cbb\u3055\u308c\u3001\u4ee5\u964d\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u7d42\u7aef\u64cd\u4f5c\u306f\u7a4d\u6975\u7684\u306a\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u7d50\u679c\u3092\u8fd4\u3059\u524d\u306b\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u51e6\u7406\u3057\u307e\u3059\u3002\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u7d42\u7aef\u30e1\u30bd\u30c3\u30c9\u306f\u3001forEach\u3001toArray\u3001min\u3001max\u3001findFirst\u3001anyMatch\u3001allMatch\u306a\u3069\u3067\u3059\u3002\u7d42\u7aef\u30e1\u30bd\u30c3\u30c9\u306f\u623b\u308a\u5024\u306e\u578b\u304b\u3089\u7279\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u308c\u3089\u306f\u6c7a\u3057\u3066Stream\u3092\u8fd4\u3057\u307e\u305b\u3093\u3002<\/p>\n
                              Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30c3\u30c8\u64cd\u4f5c<\/h3>\n
                              \u4e2d\u9593\u64cd\u4f5c\u304c\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u547c\u3070\u308c\u308b\u306e\u306f\u3001\u7121\u9650\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u5bfe\u3057\u3066\u6709\u9650\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u751f\u6210\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001limit()\u3084skip()\u306f2\u3064\u306e\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306a\u4e2d\u9593\u64cd\u4f5c\u3067\u3059\u3002\u7aef\u672b\u64cd\u4f5c\u304c\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u547c\u3070\u308c\u308b\u306e\u306f\u3001\u7121\u9650\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u5bfe\u3057\u3066\u6709\u9650\u6642\u9593\u3067\u7d42\u4e86\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001anyMatch\u3001allMatch\u3001noneMatch\u3001findFirst\u3001findAny\u306f\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306a\u7aef\u672b\u64cd\u4f5c\u3067\u3059\u3002<\/p>\n
                              Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f8b<\/h3>\n
                              \u79c1\u306fJava 8 Stream API\u306e\u307b\u307c\u3059\u3079\u3066\u306e\u91cd\u8981\u306a\u90e8\u5206\u3092\u7db2\u7f85\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u65b0\u3057\u3044API\u306e\u6a5f\u80fd\u3092\u4f7f\u3046\u306e\u306f\u8208\u596e\u3057\u307e\u3059\u3057\u3001\u3044\u304f\u3064\u304b\u306eJava\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                              Java \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f5c\u6210<\/h4>\n
                              \u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089Java\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u7c21\u5358\u306a\u4f8b\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                                \n
                              1. \n
                                  \u4f3c\u305f\u7a2e\u985e\u306e\u30c7\u30fc\u30bf\u304b\u3089\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u306f\u3001Stream.of()\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001int\u3084Integer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b0\u30eb\u30fc\u30d7\u304b\u3089Java Stream\u306e\u6574\u6570\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                   <\/p>\n
                                    \n
                                  1. \n
                                      Stream stream = Stream.of(1,2,3,4);<\/ol>\n<\/li>\n<\/ol>\n
                                      \u914d\u5217\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066Stream.of()\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306e\u914d\u5217\u3092\u6e21\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002
                                      \nStream stream = Stream.of(new Integer[]{1,2,3,4});
                                      \n\/\/\u3046\u307e\u304f\u52d5\u4f5c\u3057\u307e\u3059
                                      \nStream stream1 = Stream.of(new int[]{1,2,3,4});
                                      \n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3001\u578b\u306e\u4e0d\u4e00\u81f4: Stream<int[]>\u3092Stream\u306b\u5909\u63db\u3067\u304d\u307e\u305b\u3093<\/p>\n
                                      Collection\u306estream()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u9806\u6b21\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3057\u3001parallelStream()\u3092\u4f7f\u7528\u3057\u3066\u4e26\u5217\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
                                      \nList myList = new ArrayList<>();
                                      \nfor(int i=0; i<100; i++) myList.add(i);<\/p>\n
                                      \/\/\u9806\u6b21\u306e\u30b9\u30c8\u30ea\u30fc\u30e0
                                      \nStream sequentialStream = myList.stream();<\/p>\n
                                      \/\/\u4e26\u5217\u30b9\u30c8\u30ea\u30fc\u30e0
                                      \nStream parallelStream = myList.parallelStream();<\/p>\n
                                      Stream.generate()\u30e1\u30bd\u30c3\u30c9\u3068Stream.iterate()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
                                      \nStream stream1 = Stream.generate(() -> {return “abc”;});
                                      \nStream stream2 = Stream.iterate(“abc”, (i) -> i);<\/p>\n
                                      Arrays.stream()\u30e1\u30bd\u30c3\u30c9\u3068String.chars()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002
                                      \nLongStream is = Arrays.stream(new long[]{1,2,3,4});
                                      \nIntStream is2 = “abc”.chars();<\/p>\n
                                      Java Stream\u3092\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u307e\u305f\u306f\u914d\u5217\u306b\u5909\u63db\u3059\u308b<\/h4>\n
                                      Java Stream\u304b\u3089\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
                                        \n
                                      1. \n
                                          Java\u306eStream\u30af\u30e9\u30b9\u306ecollect()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089List\u3001Map\u3001\u307e\u305f\u306fSet\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                           <\/p>\n
                                            \n
                                          1. \n
                                              Stream intStream = Stream.of(1, 2, 3, 4);<\/ol>\n<\/li>\n<\/ol>\n
                                               <\/p>\n
                                                \n
                                              1. \n
                                                  List intList = intStream.collect(Collectors.toList());<\/ol>\n<\/li>\n<\/ol>\n
                                                   <\/p>\n
                                                    \n
                                                  1. \n
                                                      System.out.println(intList); \/\/ [1, 2, 3, 4]\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                                      intStream = Stream.of(1, 2, 3, 4); \/\/ \u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u9589\u3058\u305f\u305f\u3081\u3001\u518d\u3073\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059
                                                      \nMap<Integer, Integer> intMap = intStream.collect(Collectors.toMap(i -> i, i -> i + 10));
                                                      \nSystem.out.println(intMap); \/\/ {1=11, 2=12, 3=13, 4=14}\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
                                                      \u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u3001stream\u306etoArray()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002
                                                      \nStream intStream = Stream.of(1, 2, 3, 4);
                                                      \nInteger[] intArray = intStream.toArray(Integer[]::new);
                                                      \nSystem.out.println(Arrays.toString(intArray)); \/\/ [1, 2, 3, 4]\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
                                                      Java Stream\u306e\u4e2d\u9593\u64cd\u4f5c<\/h3>\n
                                                      \uff08Java Stream\u306e\uff09\u4e2d\u9593\u64cd\u4f5c<\/p>\n
                                                      \u3088\u304f\u4f7f\u308f\u308c\u308bJava Stream\u306e\u4e2d\u9593\u64cd\u4f5c\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                                                        \n
                                                      1. \n
                                                          \u30b9\u30c8\u30ea\u30fc\u30e0\u306efilter()\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\uff1afilter()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u8981\u7d20\u3092\u6761\u4ef6\u306b\u30c6\u30b9\u30c8\u3057\u3001\u30d5\u30a3\u30eb\u30bf\u30fc\u3055\u308c\u305f\u30ea\u30b9\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                                           <\/p>\n
                                                            \n
                                                          1. \n
                                                              List myList = new ArrayList<>();<\/ol>\n<\/li>\n<\/ol>\n
                                                               <\/p>\n
                                                                \n
                                                              1. \n
                                                                  for(int i=0; i<100; i++) myList.add(i);<\/ol>\n<\/li>\n<\/ol>\n
                                                                   <\/p>\n
                                                                    \n
                                                                  1. \n
                                                                      Stream sequentialStream = myList.stream();<\/ol>\n<\/li>\n<\/ol>\n
                                                                      Stream highNums = sequentialStream.filter(p -> p > 90); \/\/90\u3088\u308a\u5927\u304d\u3044\u6570\u5b57\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0
                                                                      \nSystem.out.print(“High Nums greater than 90=”);
                                                                      \nhighNums.forEach(p -> System.out.print(p+” “));
                                                                      \n\/\/\u7d50\u679c\uff1a”High Nums greater than 90=91 92 93 94 95 96 97 98 99 ”<\/p>\n
                                                                      \u30b9\u30c8\u30ea\u30fc\u30e0\u306emap()\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\uff1amap()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u95a2\u6570\u3092\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6587\u5b57\u5217\u306e\u30ea\u30b9\u30c8\u306b\u5927\u6587\u5b57\u306e\u95a2\u6570\u3092\u9069\u7528\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002
                                                                      \nStream names = Stream.of(“aBc”, “d”, “ef”);
                                                                      \nSystem.out.println(names.map(s -> {
                                                                      \nreturn s.toUpperCase();
                                                                      \n}).collect(Collectors.toList()));
                                                                      \n\/\/\u7d50\u679c\uff1a[ABC, D, EF]<\/p>\n
                                                                      \u30b9\u30c8\u30ea\u30fc\u30e0\u306esorted()\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\uff1asorted()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u8981\u7d20\u3092Comparator\u5f15\u6570\u3067\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
                                                                      \nStream names2 = Stream.of(“aBc”, “d”, “ef”, “123456”);
                                                                      \nList reverseSorted = names2.sorted(Comparator.reverseOrder()).collect(Collectors.toList());
                                                                      \nSystem.out.println(reverseSorted); \/\/ [ef, d, aBc, 123456]<\/p>\n
                                                                      Stream names3 = Stream.of(“aBc”, “d”, “ef”, “123456”);
                                                                      \nList naturalSorted = names3.sorted().collect(Collectors.toList());
                                                                      \nSystem.out.println(naturalSorted); \/\/[123456, aBc, d, ef]<\/p>\n
                                                                      \u30b9\u30c8\u30ea\u30fc\u30e0\u306eflatMap()\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\uff1aflatMap()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30ea\u30b9\u30c8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u7591\u554f\u3092\u89e3\u6d88\u3059\u308b\u305f\u3081\u306e\u7c21\u5358\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002
                                                                      \nStream<List> namesOriginalList = Stream.of(
                                                                      \nArrays.asList(“Pankaj”),
                                                                      \nArrays.asList(“David”, “Lisa”),
                                                                      \nArrays.asList(“Amit”));
                                                                      \n\/\/List\u304b\u3089String\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u30d5\u30e9\u30c3\u30c8\u5316\u3059\u308b
                                                                      \nStream flatStream = namesOriginalList
                                                                      \n.flatMap(strList -> strList.stream());<\/p>\n
                                                                      flatStream.forEach(System.out::println);<\/p>\n
                                                                      Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u7d42\u7aef\u64cd\u4f5c<\/h3>\n
                                                                      Java\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7aef\u672b\u64cd\u4f5c\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                                                                        \n
                                                                      1. \n
                                                                          \u30b9\u30c8\u30ea\u30fc\u30e0reduce\uff08\uff09\u306e\u4f8b\uff1a\u79c1\u305f\u3061\u306freduce\uff08\uff09\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u8981\u7d20\u306b\u6e1b\u5c11\u3092\u884c\u3044\u3001\u9023\u60f3\u7a4d\u7b97\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066Optional\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u306e\u6574\u6570\u3092\u4e57\u7b97\u3059\u308b\u305f\u3081\u306b\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                                                           <\/p>\n
                                                                            \n
                                                                          1. \n
                                                                              Stream numbers = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;<\/ol>\n<\/li>\n<\/ol>\n
                                                                              Optional intOptional = numbers.reduce\uff08\uff08i\u3001j\uff09\u2192 {return i*j;}\uff09;
                                                                              \nif\uff08intOptional.isPresent\uff08\uff09\uff09System.out.println\uff08”Multiplication = “+ intOptional.get\uff08\uff09\uff09; \/\/120<\/p>\n
                                                                              \u30b9\u30c8\u30ea\u30fc\u30e0count\uff08\uff09\u306e\u4f8b\uff1a\u3053\u306e\u7d42\u7aef\u64cd\u4f5c\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u306e\u30a2\u30a4\u30c6\u30e0\u306e\u6570\u3092\u6570\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
                                                                              \nStream numbers1 = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;<\/p>\n
                                                                              System.out.println\uff08”Number of elements in stream =”+ numbers1.count\uff08\uff09\uff09; \/\/5<\/p>\n
                                                                              Stream forEach\uff08\uff09\u306e\u4f8b\uff1a\u3053\u308c\u306f\u30b9\u30c8\u30ea\u30fc\u30e0\u4e0a\u3067\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u306e\u4ee3\u308f\u308a\u306b\u3053\u308c\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u5370\u5237\u3059\u308b\u305f\u3081\u306b\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002
                                                                              \nStream numbers2 = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;
                                                                              \nnumbers2.forEach\uff08i\u2192 System.out.print\uff08i + “,”\uff09\uff09; \/\/1,2,3,4,5,<\/p>\n
                                                                              \u30b9\u30c8\u30ea\u30fc\u30e0match\uff08\uff09\u306e\u4f8b\uff1aStream API\u306e\u4e00\u81f4\u30e1\u30bd\u30c3\u30c9\u306e\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002
                                                                              \nStream numbers3 = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;
                                                                              \nSystem.out.println\uff08”Stream contains 4? “+ numbers3.anyMatch\uff08i\u2192 i == 4\uff09\uff09;
                                                                              \n\/\/ Stream contains 4? true<\/p>\n
                                                                              Stream numbers4 = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;
                                                                              \nSystem.out.println\uff08”Stream contains all elements less than 10? “+ numbers4.allMatch\uff08i\u2192 i < 10\uff09\uff09;
                                                                              \n\/\/ Stream contains all elements less than 10? true<\/p>\n
                                                                              Stream numbers5 = Stream.of\uff081\u30012\u30013\u30014\u30015\uff09;
                                                                              \nSystem.out.println\uff08”Stream doesn’t contain 10? “+ numbers5.noneMatch\uff08i\u2192 i == 10\uff09\uff09;
                                                                              \n\/\/ Stream doesn’t contain 10? true<\/p>\n
                                                                              findFirst\uff08\uff09\u306e\u4f8b\uff1a\u3053\u308c\u306f\u30b7\u30e7\u30fc\u30c8\u30b5\u30fc\u30ad\u30c3\u30c8\u7d42\u7aef\u64cd\u4f5c\u3067\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089\u6700\u521d\u306e\u6587\u5b57\u5217\u3092\u63a2\u3059\u305f\u3081\u306b\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002 D\u3067\u59cb\u307e\u308b\u30b9\u30c8\u30ea\u30fc\u30e0\u3002
                                                                              \nStream names4 = Stream.of\uff08”Pankaj”\u3001”Amit”\u3001”David”\u3001”Lisa”\uff09;
                                                                              \nOptional firstNameWithD = names4.filter\uff08i\u2192 i.startsWith\uff08”D”\uff09\uff09.findFirst\uff08\uff09;
                                                                              \nif\uff08firstNameWithD.isPresent\uff08\uff09\uff09{
                                                                              \nSystem.out.println\uff08”First Name starting with D =”+ firstNameWithD.get\uff08\uff09\uff09; \/\/David
                                                                              \n}<\/p>\n
                                                                              Java 8 \u30b9\u30c8\u30ea\u30fc\u30e0 API \u306e\u5236\u7d04<\/h3>\n
                                                                              Java 8\u306eStream API\u306f\u3001\u30ea\u30b9\u30c8\u3084\u914d\u5217\u306b\u591a\u304f\u306e\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u5236\u9650\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
                                                                                \n
                                                                              1. \n
                                                                                  \u30b9\u30c6\u30fc\u30c8\u30ec\u30b9\u306a\u30e9\u30e0\u30c0\u5f0f: \u30d1\u30e9\u30ec\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30b9\u30c6\u30fc\u30c8\u30d5\u30eb\u306a\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u3068\u30e9\u30f3\u30c0\u30e0\u306a\u5fdc\u7b54\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002StatefulParallelStream.java<\/ol>\n<\/li>\n<\/ol>\n
                                                                                  package com.scdev.java8.stream;<\/p>\n
                                                                                  import java.util.ArrayList;
                                                                                  \nimport java.util.Arrays;
                                                                                  \nimport java.util.List;
                                                                                  \nimport java.util.stream.Stream;<\/p>\n
                                                                                  public class StatefulParallelStream {<\/p>\n
                                                                                  public static void main(String[] args) {<\/p>\n
                                                                                  List ss = Arrays.asList(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);
                                                                                  \nList result = new ArrayList();<\/p>\n
                                                                                  Stream stream = ss.parallelStream();<\/p>\n
                                                                                  stream.map(s -> {
                                                                                  \nsynchronized (result) {
                                                                                  \nif (result.size() < 10) { result.add(s); } } return s; }).forEach( e -> {});
                                                                                  \nSystem.out.println(result);
                                                                                  \n}
                                                                                  \n}<\/p>\n
                                                                                  \u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u7570\u306a\u308b\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u53cd\u5fa9\u65b9\u6cd5\u306b\u4f9d\u5b58\u3057\u3001\u4e26\u5217\u51e6\u7406\u306e\u9806\u5e8f\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u9010\u6b21\u7684\u306a\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u3053\u306e\u554f\u984c\u306f\u767a\u751f\u3057\u307e\u305b\u3093\u3002<\/p>\n
                                                                                  \u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u6d88\u8cbb\u3055\u308c\u308b\u3068\u3001\u5f8c\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u6bce\u56de\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n
                                                                                  Stream API\u306b\u306f\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u3001\u6700\u3082\u6df7\u4e71\u3059\u308b\u90e8\u5206\u306f\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b66\u7fd2\u66f2\u7dda\u304c\u6642\u9593\u3092\u53d6\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
                                                                                  \u3053\u308c\u3067Java 8\u306eStream\u306e\u4f8b\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u7d42\u308f\u308a\u3067\u3059\u3002\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u3063\u3066\u3001\u4e26\u5217\u51e6\u7406\u3092\u901a\u3058\u3066\u30b3\u30fc\u30c9\u3092\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u3092\u697d\u3057\u307f\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u53c2\u8003\u6587\u732e\uff1aJava Stream API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                                                                  Java 8 Stream API\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3078\u3088\u3046\u3053\u305d\u3002\u904e\u53bb\u6570\u56de\u306eJava 8\u306e\u6295\u7a3f\u3067\u306f\u3001Java 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5909\u66f4\u3084\u95a2\u6570\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u30e9\u30e0\u30c0\u5f0f\u306b\u3064\u3044\u3066\u898b\u3066\u304d\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001Java 8\u3067\u5c0e\u5165\u3055\u308c\u305f\u4e3b\u8981 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-850","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava 8\u306e\u30b9\u30c8\u30ea\u30fc\u30e0 - Java\u30b9\u30c8\u30ea\u30fc\u30e0 - 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