{"id":2250,"date":"2018-02-09T17:24:48","date_gmt":"2018-02-09T09:24:48","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=2250"},"modified":"2018-02-09T17:25:36","modified_gmt":"2018-02-09T09:25:36","slug":"java8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e6%8e%a2%e7%a7%98","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2250","title":{"rendered":"Java8\u51fd\u6570\u5f0f\u7f16\u7a0b\u63a2\u79d8"},"content":{"rendered":"

[java]\u5f15\u5b50
\n \u5c06\u884c\u4e3a\u4f5c\u4e3a\u6570\u636e\u4f20\u9012
\nJava8\u51fd\u6570\u6846\u67b6\u89e3\u8bfb
\n \u51fd\u6570\u63a5\u53e3
\n \u805a\u5408\u5668
\n Reduce
\n \u56db\u8981\u7d20
\n \u5217\u8868\u7c7b\u805a\u5408\u5668
\n \u6620\u5c04\u7c7b\u805a\u5408\u5668
\n \u81ea\u5b9a\u4e49\u805a\u5408\u5668
\n \u6d41
\n Stream\u7684\u63a5\u53e3
\n collector\u5b9e\u73b0
\n Pipeline
\n\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u76ca\u5904
\n \u66f4\u7cbe\u7ec3\u7684\u4ee3\u7801
\n \u66f4\u901a\u7528\u7684\u4ee3\u7801
\n \u66f4\u53ef\u6d4b\u7684\u4ee3\u7801
\n \u7ec4\u5408\u7684\u529b\u91cf
\nJava8\u6cdb\u578b
\n\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b
\n\u5c0f\u7ed3[\/java]<\/p>\n

\u5f15\u5b50<\/h2>\n

\u5c06\u884c\u4e3a\u4f5c\u4e3a\u6570\u636e\u4f20\u9012<\/h3>\n

\u600e\u6837\u5728\u4e00\u884c\u4ee3\u7801\u91cc\u540c\u65f6\u8ba1\u7b97\u4e00\u4e2a\u5217\u8868\u7684\u548c\u3001\u6700\u5927\u503c\u3001\u6700\u5c0f\u503c\u3001\u5e73\u5747\u503c\u3001\u5143\u7d20\u4e2a\u6570\u3001\u5947\u5076\u5206\u7ec4\u3001\u6307\u6570\u3001\u6392\u5e8f\u5462\uff1f<\/p>\n

\u7b54\u6848\u662f\u601d\u7ef4\u53cd\u8f6c\uff01\u5c06\u884c\u4e3a\u4f5c\u4e3a\u6570\u636e\u4f20\u9012\u3002 \u6587\u827a\u9752\u5e74\u7684\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

\n
public<\/span><\/span> class<\/span><\/span><\/span> FunctionUtil<\/span> <\/span>{\r\n\r\n   public<\/span><\/span> static<\/span><\/span> <T,R> List<R> <\/span>multiGetResult<\/span><\/span><\/span>(List<Function<List<T>, R>> functions, List<T> list)<\/span> <\/span>{\r\n     return<\/span><\/span> functions.stream<\/span>().map<\/span>(f -> f.apply<\/span>(list)).collect<\/span>(Collectors.toList<\/span>());\r\n   }\r\n\r\n   public<\/span><\/span><\/span> static<\/span><\/span><\/span> void<\/span><\/span><\/span> main<\/span><\/span><\/span>(String[] args)<\/span> <\/span>{\r\n     System.out<\/span>.println<\/span>(multiGetResult<\/span>(\r\n         Arrays.asList<\/span>(\r\n             list -> list.stream<\/span>().collect<\/span>(Collectors.summarizingInt<\/span>(x->x)),\r\n             list -> list.stream<\/span>().filter<\/span>(x -> x < 50<\/span><\/span>).sorted<\/span>().collect<\/span>(Collectors.toList<\/span>()),\r\n             list -> list.stream<\/span>().collect<\/span>(Collectors.groupingBy<\/span>(x->(x%2<\/span><\/span>==0<\/span><\/span>? \"even\"<\/span><\/span>: \"odd\"<\/span><\/span>))),\r\n             list -> list.stream<\/span>().sorted<\/span>().collect<\/span>(Collectors.toList<\/span>()),\r\n             list -> list.stream<\/span>().sorted<\/span>().map<\/span>(Math::sqrt).collect<\/span>(Collectors.toMap<\/span>(x->x, y->Math.pow<\/span>(2<\/span><\/span>,y)))),\r\n         Arrays.asList<\/span>(64<\/span><\/span>,49<\/span><\/span>,25<\/span><\/span>,16<\/span><\/span>,9<\/span><\/span>,4<\/span><\/span>,1<\/span><\/span>,81<\/span><\/span>,36<\/span><\/span>)));\r\n   }\r\n}<\/code><\/pre>\n<\/div>\n
\u5443\uff0c\u6709\u70b9\u5356\u5f04\u5c0f\u806a\u660e\u3002 \u4e0d\u8fc7\u8981\u662f\u80fd\u5c06\u884c\u4e3a\u4f5c\u4e3a\u6570\u636e\u81ea\u7531\u4f20\u9012\u548c\u65bd\u52a0\u4e8e\u6570\u636e\u96c6\u4ea7\u751f\u7ed3\u679c\uff0c\u90a3\u4e48\u5176\u4ee3\u7801\u8868\u8fbe\u80fd\u529b\u5c06\u5982\u5e84\u5b50\u4e4b\u8a00\uff0c\u6063\u610f\u6f47\u6d12\u800c\u65e0\u6240\u6781\u9650\u3002\u75c5\u6bd2\uff0c\u4e0d\u5c31\u662f\u5c06\u884c\u4e3a\u533f\u8eab\u4e8e\u6570\u636e\u4e2d\u7684\u4e00\u79cd\u8868\u73b0\u4e48\uff1f<\/p>\n
\u884c\u4e3a\u5c31\u662f\u6570\u636e\u3002<\/p><\/blockquote>\n
Java8\u51fd\u6570\u6846\u67b6\u89e3\u8bfb<\/h2>\n
\u51fd\u6570\u7f16\u7a0b\u7684\u6700\u76f4\u63a5\u7684\u8868\u73b0\uff0c\u83ab\u8fc7\u4e8e\u5c06\u51fd\u6570\u4f5c\u4e3a\u6570\u636e\u81ea\u7531\u4f20\u9012\uff0c\u7ed3\u5408\u6cdb\u578b\u63a8\u5bfc\u80fd\u529b\uff0c\u4f7f\u4ee3\u7801\u8868\u8fbe\u80fd\u529b\u83b7\u5f97\u98de\u4e00\u822c\u7684\u63d0\u5347<\/strong>\u3002\u90a3\u4e48\uff0cJava8\u662f\u600e\u4e48\u652f\u6301\u51fd\u6570\u7f16\u7a0b\u7684\u5462\uff1f\u4e3b\u8981\u6709\u4e09\u4e2a\u6838\u5fc3\u6982\u5ff5\uff1a<\/p>\n