{"id":1392,"date":"2013-12-23T15:28:33","date_gmt":"2013-12-23T06:28:33","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=1392"},"modified":"2013-12-23T21:12:20","modified_gmt":"2013-12-23T12:12:20","slug":"stream-api-%e3%81%ae%e5%be%a9%e7%bf%92","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=1392","title":{"rendered":"Stream API \u306e\u5fa9\u7fd2"},"content":{"rendered":"

\u6765\u5e74\u306e3\u670818\u65e5\u306b Java 8 \u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u3068\u3042\u3063\u3066\u3053\u306e\u3068\u3053\u308d\u65e5\u672c\u8a9e\u3067\u306e\u60c5\u5831\u3082\u305f\u304f\u3055\u3093\u30cd\u30c3\u30c8\u4e0a\u306b\u51fa\u56de\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u4ee5\u524d\u3001\u300cJDK8 Lambda \u305d\u306e\u4ed6\u3044\u308d\u3044\u308d \u306a\u3093\u3067\u3082\u3044\u3044\u304b\u3089\u52d5\u304b\u3057\u3066\u307f\u308b\u300d\u30b7\u30ea\u30fc\u30ba\u3001\u300c\u3082\u3063\u3068 Lambda\u300d\u30b7\u30ea\u30fc\u30ba\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3067\u9069\u5f53\u306b\u904a\u3093\u3067\u307e\u3057\u305f\u3002<\/p>\n

\u5c11\u3057 API \u306e\u5909\u66f4\u306a\u3069\u3042\u3063\u3066\u52d5\u304b\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u305d\u3053\u3067 Java Advent Calendar 2013<\/a> \u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3067\u5fa9\u7fd2\u306b\u3074\u3063\u305f\u308a\u306e\u8a18\u4e8b\u3092\u898b\u3064\u3051\u305f\u306e\u3067\u5199\u7d4c\u3055\u305b\u3066\u3044\u305f\u3060\u304f\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u300c\u30e9\u30e0\u30c0\u306b\u3064\u3044\u3066\u3001\u25cb\u3093\u25cb\u51fa\u3057\u3066\u8003\u3048\u3066\u307f\u305f\uff01\u300d\u3068\u3042\u3063\u3066\u30d3\u30c3\u30af\u30ea\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u6700\u521d\u300c\u30e9\u30e0\u30c0\u306b\u3064\u3044\u3066\u3001\u3046\u3093\u3053\u51fa\u3057\u3066\u8003\u3048\u3066\u307f\u305f\uff01\u300d\u3068\u9023\u60f3\u3057\u3066\u3057\u307e\u3044\u3001\u306a\u3093\u3060\uff01\u3053\u306e\u4eba\u306f\u3068\u9a5a\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u5c11\u3057\u3057\u3066\u304b\u3089\u300c\u30e9\u30e0\u30c0\u306b\u3064\u3044\u3066\u3001\u307b\u3093\u304d\u51fa\u3057\u3066\u8003\u3048\u3066\u307f\u305f\uff01\u300d\u3060\u3088\u306a\u3063\u3066\u5225\u89e3\u304c\u3067\u307e\u3057\u305f\u3002<\/p>\n

\u307e\u3041\u3001\u308f\u3056\u308f\u3056\u4f0f\u305b\u3066\u3044\u308b\u3068\u3053\u308d\u3092\u307f\u308b\u3068\u4f5c\u8005\u306e\u7f60\u306b\u307e\u3093\u307e\u3068\u306f\u307e\u3063\u305f\u3068\u601d\u3046\u3002<\/p>\n

\u3061\u306a\u307f\u306b\u3001\u25cb\u3093\u25cb\u51fa\u3057\u3066\u8003\u3048\u3066\u307f\u305f\uff01\u3068\u3044\u3046\u30b5\u30a4\u30c8\u306f\u4e0b\u8a18\u3067\u3059\u3002<\/p>\n

\u30e9\u30e0\u30c0\u7981\u6b62\u306b\u3064\u3044\u3066\u672c\u6c17\u51fa\u3057\u3066\u8003\u3048\u3066\u307f\u305f – 9\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u898b\u308bStream API<\/a><\/p>\n

\u3068\u3066\u3082\u3044\u3044\u3067\u3059\u306d\u3002<\/p>\n

\u305f\u3060\u7981\u6b62\u5ea6\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3053\u308c\u306f\u3053\u306e\u30b5\u30a4\u30c8\u306e\u8457\u8005\u304c\u72ec\u65ad\u3067\u8003\u616e\u3057\u3066\u6c7a\u3081\u3089\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n

\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u5224\u65ad\u306a\u306e\u3067\u304a\u305d\u3089\u304f\u3053\u308c\u306b\u6e96\u305a\u308b\u3088\u3046\u306a\u4f01\u696d\u304c\u591a\u304f\u306a\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u306d\u3002<\/p>\n

\u79c1\u500b\u4eba\u3068\u3057\u3066\u306f\u3001\u5973\u6027\u3068 API \u306f\u65b0\u3057\u3044\u65b9\u304c\u826f\u3044\uff01\u3068\u8a00\u3046\u4eba\u9593\u306a\u306e\u3067<\/p>\n

\u300c8. stream\u4e2d\u306b\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u64cd\u4f5c\u300d \u4ee5\u5916\u306f\u4f7f\u3063\u3066\u3082\u3044\u3044\u3093\u3058\u3083\u306a\u3044\uff1f<\/p>\n

\u3068\u3044\u3046\u3088\u308a\u306f\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\uff01<\/p>\n

Java Advent Calendar 2013<\/a> \u3067\u306f\u6642\u671f\u304c\u6642\u671f\u3060\u3051\u306b Java 8 \u306b\u95a2\u3059\u308b\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u3061\u3089\u307b\u3089\u3068\u307f\u3089\u308c\u307e\u3059\u3002<\/p>\n

\u3069\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3082\u975e\u5e38\u306b\u8208\u5473\u6df1\u3044\u3082\u306e\u3070\u304b\u308a\u3067\u3059\u3002<\/p>\n

\u305d\u308c\u3067\u306f\u81ea\u5206\u7528\u306e\u03c6(\uff0e\uff0e)\u30e1\u30e2\u30e1\u30e2<\/p>\n

\u304a\u3063\u3068\u3001\u307e\u3093\u307e\u5199\u7d4c\u3057\u3066\u3082\u9762\u767d\u304f\u306a\u3044\u306e\u3067\u89e3\u308a\u3084\u3059\u304f\u5909\u66f4\u3092\u52a0\u3048\u3066\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u89e3\u8aac\u306f\u306a\u3044\u306e\u3067\u8208\u5473\u306e\u3042\u308b\u304b\u305f\u306f\u3054\u81ea\u5206\u3067\u304a\u8abf\u3079\u304f\u3060\u3055\u3044\u307e\u305b\u3002<\/p>\n

\u306a\u304a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e2d\u306b\u51fa\u3066\u304f\u308b\u4eba\u7269\u3084\u30c7\u30fc\u30bf\u306f\u5b9f\u969b\u306e\u4eba\u7269\u306e\u6b63\u78ba\u306a\u30c7\u30fc\u30bf\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3042\u3057\u304b\u3089\u305a\u3002\uff08\u306a\u3093\u306e\u3053\u3063\u3061\u3083<\/p>\n

\r\npackage jp.yucchi.mystreamexample;\r\n\r\nimport java.time.LocalDate;\r\nimport java.time.Period;\r\n\r\npublic class MyFriends {\r\n\r\n    public enum Sex {\r\n\r\n        MALE, FEMALE, OKAMA\r\n    }\r\n\r\n    String name;\r\n    LocalDate birthday;\r\n    Sex gender;\r\n    int Breast;\r\n    int waist;\r\n    int hips;\r\n\r\n    public MyFriends(String name, LocalDate birthday, Sex gender, int Breast, int waist, int hips) {\r\n        this.name = name;\r\n        this.birthday = birthday;\r\n        this.gender = gender;\r\n        this.Breast = Breast;\r\n        this.waist = waist;\r\n        this.hips = hips;\r\n    }\r\n\r\n    public int getAge() {\r\n        return Period.between(birthday, LocalDate.now()).getYears();\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public LocalDate getBirthday() {\r\n        return birthday;\r\n    }\r\n\r\n    public Sex getGender() {\r\n        return gender;\r\n    }\r\n\r\n    public int getBreast() {\r\n        return Breast;\r\n    }\r\n\r\n    public int getWaist() {\r\n        return waist;\r\n    }\r\n\r\n    public int getHips() {\r\n        return hips;\r\n    }\r\n\r\n    void printMyFriends() {\r\n        System.out.println(name + \", \" + this.getAge() + \"\u6b73\" + \", Gender: \"\r\n                + this.getGender() + \", Breast Size: \" + this.getBreast()\r\n                + \", Waist Size: \" + this.getWaist() + \", Hips Size: \" + getHips());\r\n    }\r\n}\r\n\r\n<\/pre>\n
\r\npackage jp.yucchi.mystreamexample;\r\n\r\nimport java.time.LocalDate;\r\nimport java.util.ArrayList;\r\nimport java.util.Comparator;\r\nimport java.util.IntSummaryStatistics;\r\nimport java.util.List;\r\nimport java.util.Map;\r\nimport java.util.Map.Entry;\r\nimport java.util.stream.Collectors;\r\nimport jp.yucchi.mystreamexample.MyFriends.Sex;\r\n\r\npublic class MyStreamExample {\r\n\r\n    public static void main(String[] args) {\r\n        List friend = new ArrayList<>();\r\n\r\n        friend.add(new MyFriends(\"\u67f4\u7530 \u606d\u5e73\", LocalDate.of(1951, 8, 18), MyFriends.Sex.MALE, 90, 75, 80));\r\n        friend.add(new MyFriends(\"\u5c0f\u6817 \u65ec\", LocalDate.of(1982, 12, 26), MyFriends.Sex.MALE, 85, 68, 77));\r\n        friend.add(new MyFriends(\"\u5e02\u539f \u96bc\u4eba\", LocalDate.of(1987, 2, 6), MyFriends.Sex.MALE, 88, 65, 76));\r\n        friend.add(new MyFriends(\"\u58c7 \u871c\", LocalDate.of(1980, 12, 3), MyFriends.Sex.FEMALE, 85, 60, 89));\r\n        friend.add(new MyFriends(\"\u5317\u5ddd \u666f\u5b50\", LocalDate.of(1986, 8, 22), MyFriends.Sex.FEMALE, 75, 54, 81));\r\n        friend.add(new MyFriends(\"\u7dbe\u702c \u306f\u308b\u304b\", LocalDate.of(1985, 3, 24), MyFriends.Sex.FEMALE, 88, 61, 91));\r\n        friend.add(new MyFriends(\"\u4f50\u3005\u6728 \u5e0c\", LocalDate.of(1988, 2, 8), MyFriends.Sex.FEMALE, 80, 58, 82));\r\n        friend.add(new MyFriends(\"\u525b\u529b \u5f69\u82bd\", LocalDate.of(1992, 8, 27), MyFriends.Sex.FEMALE, 77, 58, 84));\r\n        friend.add(new MyFriends(\"\u5800\u5317 \u771f\u5e0c\", LocalDate.of(1988, 10, 6), MyFriends.Sex.FEMALE, 78, 58, 83));\r\n        friend.add(new MyFriends(\"\u6b66\u4e95 \u54b2\", LocalDate.of(1993, 12, 25), MyFriends.Sex.FEMALE, 76, 58, 82));\r\n        friend.add(new MyFriends(\"\u6df1\u7530 \u606d\u5b50\", LocalDate.of(1982, 11, 2), MyFriends.Sex.FEMALE, 86, 62, 88));\r\n        friend.add(new MyFriends(\"\u306f\u308b\u306a \u611b\", LocalDate.of(1976, 7, 21), MyFriends.Sex.OKAMA, 90, 60, 89));\r\n        friend.add(new MyFriends(\"\u30de\u30c4\u30b3\u30fb\u30c7\u30e9\u30c3\u30af\u30b9\", LocalDate.of(1972, 10, 26), MyFriends.Sex.OKAMA, 150, 150, 150));\r\n\r\n        \/\/ MyFriends \u5168\u54e1\u8868\u793a\r\n        System.out.println(\"<-- MyFriends \u5168\u54e1\u8868\u793a -->\");\r\n        friend.stream().forEach((e) -> {\r\n            e.printMyFriends();\r\n        });\r\n\r\n        \/\/ \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b -->\");\r\n        Map resultBreastSize = resultBreastSize = groupBySexAndBreast(friend);\r\n        System.out.println(resultBreastSize);\r\n\r\n        \/\/ \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b\u3002(\u5225\u30d1\u30bf\u30fc\u30f3)\r\n        System.out.println(\"\\n<-- \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b\u3002(\u5225\u30d1\u30bf\u30fc\u30f3) -->\");\r\n        Map resultBreastSize2 = resultBreastSize2 = groupBySexAndBreast2(friend);\r\n        System.out.println(resultBreastSize2);\r\n\r\n        \/\/ \u6027\u5225\u304c\u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u500b\u6570\uff08\u500b\u3005\u3067\u306f\u53cb\u9054\u306e\u4eba\u6570\uff09\u3001\u5408\u8a08\u3001\u6700\u5c0f\u5024\u3001\u5e73\u5747\u5024\u3001\u6700\u5927\u5024\u3092\u53d6\u5f97\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u304c\u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u500b\u6570\uff08\u3053\u3053\u3067\u306f\u53cb\u9054\u306e\u4eba\u6570\uff09\u3001\u5408\u8a08\u3001\u6700\u5c0f\u5024\u3001\u5e73\u5747\u5024\u3001\u6700\u5927\u5024\u3092\u53d6\u5f97\u3002 -->\");\r\n        IntSummaryStatistics breastStatistics = breastAverageAndSum(friend);\r\n        System.out.println(\"count: \" + breastStatistics.getCount() + \"\\n\"\r\n                + \"sum: \" + breastStatistics.getSum() + \"\\n\"\r\n                + \"min: \" + breastStatistics.getMin() + \"\\n\"\r\n                + \"avarage: \" + breastStatistics.getAverage() + \"\\n\"\r\n                + \"max: \" + breastStatistics.getMax());\r\n\r\n        \/\/ \u5973\u6027\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u30b5\u30a4\u30ba\u306b\u3088\u3063\u3066\u964d\u9806\u30bd\u30fc\u30c8\u3002\r\n        System.out.println(\"\\n<-- \u5973\u6027\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u30b5\u30a4\u30ba\u306b\u3088\u3063\u3066\u964d\u9806\u30bd\u30fc\u30c8\u3002 -->\");\r\n        List f = breastSort(friend);\r\n        f.forEach(e -> {\r\n            System.out.println(e.getName() + \": Breast: \" + e.getBreast());\r\n        });\r\n\r\n        \/\/ \u5973\u6027\u3067\u30d0\u30b9\u30c8\u304c 80 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u5024\u306b 1000 \u3092\u8db3\u3057\u3066\u5408\u8a08\u3059\u308b\u3002\r\n        \/\/ reduce \u3092\u4f7f\u3046\uff01 sum() \u306e\u307b\u3046\u304c\u4fbf\u5229\u3060\u3051\u3069\u306d\u3002\r\n        System.out.println(\"\\n<-- \u5973\u6027\u3067\u30d0\u30b9\u30c8\u304c 80 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u5024\u306b 1000 \u3092\u8db3\u3057\u3066\u5408\u8a08\u3059\u308b\u3002 -->\");\r\n        int breastSum = addBigBreast(friend);\r\n        System.out.println(breastSum);\r\n\r\n        \/\/ \u6027\u5225\u306b\u3088\u3063\u3066\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u306b\u3088\u3063\u3066\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002 -->\");\r\n        Map> resultGender = groupByGender(friend);\r\n        for (Map.Entry> keyValue : resultGender.entrySet()) {\r\n            System.out.println(keyValue.getKey().toString());\r\n            for (int i = 0; i < keyValue.getValue().size(); i++) {\r\n                System.out.println(keyValue.getValue().get(i).getName() + \" : \" + keyValue.getValue().get(i).getAge());\r\n            }\r\n        }\r\n\r\n        \/\/ \u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u5927\u304d\u3055\u3067\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002\r\n        System.out.println(\"\\n<-- \u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u5927\u304d\u3055\u3067\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002 -->\");\r\n        Map> resultBreastRank = groupByBreastRank(friend);\r\n        for (Map.Entry> keyValue : resultBreastRank.entrySet()) {\r\n            System.out.println(keyValue.getKey().toString());\r\n            for (int i = 0; i < keyValue.getValue().size(); i++) {\r\n                System.out.println(keyValue.getValue().get(i).getName() + \" : \" + keyValue.getValue().get(i).getAge() + \" Breast: \" + keyValue.getValue().get(i).getBreast());\r\n            }\r\n        }\r\n\r\n        \/\/ \u6027\u5225\u306b\u3088\u308b\u5e73\u5747\u5e74\u9f62\u3092\u8a08\u7b97\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u306b\u3088\u308b\u5e73\u5747\u5e74\u9f62\u3092\u8a08\u7b97\u3002 -->\");\r\n        Map averageAge = groupingBySexAndAve(friend);\r\n        for (Map.Entry keyValue : averageAge.entrySet()) {\r\n            System.out.println(keyValue.getKey().toString() + \" : \" + keyValue.getValue().toString());\r\n        }\r\n\r\n        \/\/ \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002 -->\");\r\n        List sortSex = sortSexCount(friend);\r\n        sortSex.forEach(System.out::println);\r\n\r\n        \/\/ \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002\u4eba\u6570\u3082\u8868\u793a\u3055\u305b\u308b\u3002\r\n        System.out.println(\"\\n<-- \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002\u4eba\u6570\u3082\u8868\u793a\u3055\u305b\u308b\u3002 -->\");\r\n        List> sortSex2 = sortSexCount2(friend);\r\n        sortSex2.forEach(f2 -> {\r\n            System.out.println(f2.getKey() + \" : \" + f2.getValue());\r\n        });\r\n\r\n    }\r\n\r\n    private static Map groupBySexAndBreast(List friend) {\r\n        return friend.stream().collect(Collectors.groupingBy(MyFriends::getGender,\r\n                Collectors.collectingAndThen(Collectors.toList(), f -> f.stream()\r\n                        .filter(fs -> fs.getBreast() > 85)\r\n                        .count())));\r\n    }\r\n\r\n    private static Map groupBySexAndBreast2(List friend) {\r\n        return friend.stream()\r\n                .collect(Collectors.groupingBy(MyFriends::getGender))\r\n                .entrySet()\r\n                .stream()\r\n                .collect(Collectors.toMap(entry -> entry.getKey(),\r\n                                entry -> entry.getValue()\r\n                                .stream()\r\n                                .filter(f -> f.getBreast() > 85)\r\n                                .count()));\r\n\r\n    }\r\n\r\n    private static IntSummaryStatistics breastAverageAndSum(List friend) {\r\n        return friend.stream()\r\n                .filter(f -> f.getGender() == Sex.FEMALE)\r\n                .mapToInt(MyFriends::getBreast)\r\n                .summaryStatistics();\r\n\r\n    }\r\n\r\n    private static List breastSort(List friend) {\r\n        return friend.stream()\r\n                .filter(f -> f.getGender() == Sex.FEMALE)\r\n                .sorted((f1, f2) -> f2.getBreast() - f1.getBreast())\r\n                .collect(Collectors.toList());\r\n    }\r\n\r\n    private static int addBigBreast(List friend) {\r\n        return friend.stream()\r\n                .filter(f -> f.getGender() == Sex.FEMALE && f.getBreast() > 80)\r\n                .mapToInt(f -> f.getBreast() + 1000)\r\n                .reduce(0, (x, y) -> x + y);\r\n    }\r\n\r\n    private static Map> groupByGender(List friend) {\r\n        return friend.stream()\r\n                .sorted((f1, f2) -> f1.getAge() - f2.getAge())\r\n                .collect(Collectors.groupingBy(f -> f.getGender()));\r\n    }\r\n\r\n    private static Map> groupByBreastRank(List friend) {\r\n        return friend.stream()\r\n                .filter(f -> f.getGender() == Sex.FEMALE)\r\n                .sorted((f1, f2) -> f1.getAge() - f2.getAge())\r\n                .collect(Collectors.groupingBy(f -> {\r\n                    if (f.getBreast() > 85) {\r\n                        return \"< \u5de8\u4e73>\";\r\n                    }\r\n                    if (f.getBreast() > 75) {\r\n                        return \"< \u4e73 >\";\r\n                    }\r\n                    if (f.getBreast() > 65) {\r\n                        return \"< \u8ca7\u4e73 >\";\r\n                    }\r\n                    return \"\u30fb\u30fb\u30fb\";\r\n                }));\r\n    }\r\n\r\n    private static Map groupingBySexAndAve(List friend) {\r\n        return friend.stream()\r\n                .collect(Collectors.groupingBy(MyFriends::getGender, Collectors.averagingInt(MyFriends::getAge)));\r\n    }\r\n\r\n    private static List sortSexCount(List friend) {\r\n        return friend.stream()\r\n                .collect(Collectors.groupingBy(MyFriends::getGender, Collectors.counting()))\r\n                .entrySet()\r\n                .stream()\r\n                .sorted(Comparator.comparingLong(Entry::getValue))\r\n                .map(Entry::getKey)\r\n                .collect(Collectors.toList());\r\n    }\r\n\r\n    private static List> sortSexCount2(List friend) {\r\n        return friend.stream()\r\n                .collect(Collectors.groupingBy(MyFriends::getGender, Collectors.counting()))\r\n                .entrySet()\r\n                .stream()\r\n                .sorted(Comparator.comparingLong(Entry::getValue))\r\n                .collect(Collectors.toList());\r\n    }\r\n\r\n}\r\n\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/div>\n
<\/div>\n
\n
<– MyFriends \u5168\u54e1\u8868\u793a –>
\n\u67f4\u7530 \u606d\u5e73, 62\u6b73, Gender: MALE, Breast Size: 90, Waist Size: 75, Hips Size: 80
\n\u5c0f\u6817 \u65ec, 30\u6b73, Gender: MALE, Breast Size: 85, Waist Size: 68, Hips Size: 77
\n\u5e02\u539f \u96bc\u4eba, 26\u6b73, Gender: MALE, Breast Size: 88, Waist Size: 65, Hips Size: 76
\n\u58c7 \u871c, 33\u6b73, Gender: FEMALE, Breast Size: 85, Waist Size: 60, Hips Size: 89
\n\u5317\u5ddd \u666f\u5b50, 27\u6b73, Gender: FEMALE, Breast Size: 75, Waist Size: 54, Hips Size: 81
\n\u7dbe\u702c \u306f\u308b\u304b, 28\u6b73, Gender: FEMALE, Breast Size: 88, Waist Size: 61, Hips Size: 91
\n\u4f50\u3005\u6728 \u5e0c, 25\u6b73, Gender: FEMALE, Breast Size: 80, Waist Size: 58, Hips Size: 82
\n\u525b\u529b \u5f69\u82bd, 21\u6b73, Gender: FEMALE, Breast Size: 77, Waist Size: 58, Hips Size: 84
\n\u5800\u5317 \u771f\u5e0c, 25\u6b73, Gender: FEMALE, Breast Size: 78, Waist Size: 58, Hips Size: 83
\n\u6b66\u4e95 \u54b2, 19\u6b73, Gender: FEMALE, Breast Size: 76, Waist Size: 58, Hips Size: 82
\n\u6df1\u7530 \u606d\u5b50, 31\u6b73, Gender: FEMALE, Breast Size: 86, Waist Size: 62, Hips Size: 88
\n\u306f\u308b\u306a \u611b, 37\u6b73, Gender: OKAMA, Breast Size: 90, Waist Size: 60, Hips Size: 89
\n\u30de\u30c4\u30b3\u30fb\u30c7\u30e9\u30c3\u30af\u30b9, 41\u6b73, Gender: OKAMA, Breast Size: 150, Waist Size: 150, Hips Size: 150<\/p>\n
<– \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b –>
\n{FEMALE=2, MALE=2, OKAMA=2}<\/p>\n
<– \u6027\u5225\u3092\u30ad\u30fc\u306b\u3057\u305f Map \u3092\u4f5c\u308a\u30d0\u30b9\u30c8\u304c 85 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u306e\u4eba\u6570\u3092\u5165\u308c\u308b\u3002(\u5225\u30d1\u30bf\u30fc\u30f3) –>
\n{MALE=2, FEMALE=2, OKAMA=2}<\/p>\n
<– \u6027\u5225\u304c\u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u500b\u6570\uff08\u3053\u3053\u3067\u306f\u53cb\u9054\u306e\u4eba\u6570\uff09\u3001\u5408\u8a08\u3001\u6700\u5c0f\u5024\u3001\u5e73\u5747\u5024\u3001\u6700\u5927\u5024\u3092\u53d6\u5f97\u3002 –>
\ncount: 8
\nsum: 645
\nmin: 75
\navarage: 80.625
\nmax: 88<\/p>\n
<– \u5973\u6027\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u30b5\u30a4\u30ba\u306b\u3088\u3063\u3066\u964d\u9806\u30bd\u30fc\u30c8\u3002 –>
\n\u7dbe\u702c \u306f\u308b\u304b: Breast: 88
\n\u6df1\u7530 \u606d\u5b50: Breast: 86
\n\u58c7 \u871c: Breast: 85
\n\u4f50\u3005\u6728 \u5e0c: Breast: 80
\n\u5800\u5317 \u771f\u5e0c: Breast: 78
\n\u525b\u529b \u5f69\u82bd: Breast: 77
\n\u6b66\u4e95 \u54b2: Breast: 76
\n\u5317\u5ddd \u666f\u5b50: Breast: 75<\/p>\n
<– \u5973\u6027\u3067\u30d0\u30b9\u30c8\u304c 80 \u3088\u308a\u5927\u304d\u3044\u53cb\u9054\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u30d0\u30b9\u30c8\u306e\u5024\u306b 1000 \u3092\u8db3\u3057\u3066\u5408\u8a08\u3059\u308b\u3002 –>
\n3259<\/p>\n
<– \u6027\u5225\u306b\u3088\u3063\u3066\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002 –>
\nMALE
\n\u5e02\u539f \u96bc\u4eba : 26
\n\u5c0f\u6817 \u65ec : 30
\n\u67f4\u7530 \u606d\u5e73 : 62
\nFEMALE
\n\u6b66\u4e95 \u54b2 : 19
\n\u525b\u529b \u5f69\u82bd : 21
\n\u4f50\u3005\u6728 \u5e0c : 25
\n\u5800\u5317 \u771f\u5e0c : 25
\n\u5317\u5ddd \u666f\u5b50 : 27
\n\u7dbe\u702c \u306f\u308b\u304b : 28
\n\u6df1\u7530 \u606d\u5b50 : 31
\n\u58c7 \u871c : 33
\nOKAMA
\n\u306f\u308b\u306a \u611b : 37
\n\u30de\u30c4\u30b3\u30fb\u30c7\u30e9\u30c3\u30af\u30b9 : 41<\/p>\n
<– \u5973\u6027\u306e\u30d0\u30b9\u30c8\u306e\u5927\u304d\u3055\u3067\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u3066\u5e74\u9f62\u306e\u82e5\u3044\u9806\u306b\u8868\u793a\u3055\u305b\u308b\u3002 –>
\n< \u8ca7\u4e73 >
\n\u5317\u5ddd \u666f\u5b50 : 27 Breast: 75
\n< \u5de8\u4e73>
\n\u7dbe\u702c \u306f\u308b\u304b : 28 Breast: 88
\n\u6df1\u7530 \u606d\u5b50 : 31 Breast: 86
\n< \u4e73 >
\n\u6b66\u4e95 \u54b2 : 19 Breast: 76
\n\u525b\u529b \u5f69\u82bd : 21 Breast: 77
\n\u4f50\u3005\u6728 \u5e0c : 25 Breast: 80
\n\u5800\u5317 \u771f\u5e0c : 25 Breast: 78
\n\u58c7 \u871c : 33 Breast: 85<\/p>\n
<– \u6027\u5225\u306b\u3088\u308b\u5e73\u5747\u5e74\u9f62\u3092\u8a08\u7b97\u3002 –>
\nFEMALE : 26.125
\nMALE : 39.333333333333336
\nOKAMA : 39.0<\/p>\n
<– \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002 –>
\nOKAMA
\nMALE
\nFEMALE<\/p>\n
<– \u6027\u5225\u306b\u3088\u308b\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3092\u3057\u3066\u4eba\u6570\u306e\u5c11\u306a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3002\u4eba\u6570\u3082\u8868\u793a\u3055\u305b\u308b\u3002 –>
\nOKAMA : 2
\nMALE : 3
\nFEMALE : 8<\/p>\n<\/div>\n
<\/div>\n
Hatena \u30bf\u30b0: Java<\/a><\/div>\n
\n            
\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0<\/a><\/div>\n            
Facebook \u306b\u30b7\u30a7\u30a2<\/a><\/div>\n            
<\/g:plusone><\/div>\n            
Tweet<\/a><\/div>\n    <\/div>\n
\n","protected":false},"excerpt":{"rendered":"
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