{"id":12819,"date":"2023-09-22T20:52:17","date_gmt":"2023-09-22T12:52:17","guid":{"rendered":"https:\/\/92it.top\/?p=12819"},"modified":"2023-09-22T20:52:17","modified_gmt":"2023-09-22T12:52:17","slug":"java-stream%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e5%92%8c%e5%88%9d%e5%a7%8b%e5%8c%96%e6%ba%90%e7%a0%81%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=12819","title":{"rendered":"JAVA-stream\u6570\u636e\u7ed3\u6784\u548c\u521d\u59cb\u5316\u6e90\u7801\u8be6\u89e3"},"content":{"rendered":"\n

stream<\/strong><\/p>\n\n\n\n

\n\n\n\n

stream\u662fjava8\u65b0\u589e\u7684\u975e\u5e38\u91cd\u8981\u7684\u4e00\u4e2a\u7279\u6027\u3002\u5e76\u4e14\u975e\u5e38\u7684\u5e38\u7528\u3002\u5b83\u5b9e\u73b0\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002\u5177\u4f53\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6982\u5ff5\u5df2\u7ecf\u5f88\u4e45\u4e86\uff0c\u6bd4\u5982js\u4e2d\u7684\u7bad\u5934\u51fd\u6570\u3002java\u4e2d\u4e5f\u901a\u8fc7stream\u505a\u51fa\u4e86\u652f\u6301\u3002<\/p>\n\n\n\n

\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u65b9\u4fbf\u7684\u5904\u7406\u5f88\u591a\u4e1c\u897f\u3002\u5904\u7406\u5206\u4e3a\u4e24\u79cd\uff0c\u4e2d\u95f4\u6001\u548c\u7ed3\u679c\u6001\u3002<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n


\u4e0b\u9762\u662f\u4e00\u4e9b\u4e2d\u95f4\u6001\u64cd\u4f5c\u3002\u4ed6\u4eec\u4f4d\u4e8e\u94fe\u5f0f\u64cd\u4f5c\u7684\u4e2d\u95f4\uff0c\u5f53\u8c03\u7528\u4ed6\u4eec\u7684\u65f6\u5019\u5e76\u6ca1\u6709\u771f\u6b63\u6267\u884c\u3002\u53ea\u6709\u5f53\u8c03\u7528\u7ed3\u679c\u6001\u7684\u65b9\u6cd5\u7684\u65f6\u5019\u624d\u4f1a\u771f\u6b63\u7684\u6267\u884c\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u5ef6\u8fdf\u6267\u884c<\/code>\u3002<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

stream\u7684\u521d\u59cb\u5316<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u9700\u6c42\u3002\u8f93\u51fa\u5927\u4e8e5\u7684\u6240\u6709\u6570\u3002<\/p>\n\n\n\n

 \u671f\u671b\u8f93\u5165\uff1a2\uff0c5\uff0c7\uff0c1\uff0c3\uff0c2\uff0c8\n \u671f\u671b\u8f93\u51fa\uff1a7\uff0c8<\/pre>\n\n\n\n
\/\/\u9996\u5148\u521d\u59cb\u5316\u8f93\u5165\u5217\u8868\nList<String> list = new ArrayList<>();\nlist.add(\"2\");\nlist.add(\"5\");\nlist.add(\"7\");\nlist.add(\"1\");\nlist.add(\"3\");\nlist.add(\"2\");\nlist.add(\"8\");\n\n\/\/\u5f00\u59cb\u6267\u884c\u64cd\u4f5c\nList<Integer> list2 = list.stream().map(Integer::valueOf).filter(x -> {\n            return x > 5;\n        }).collect(Collectors.toList());\n\n\/\/\u8f93\u51fa\nSystem.out.println(list2);\n<\/pre>\n\n\n\n
\u63a5\u4e0b\u6765\u770b\u4e00\u4e0bstream\u662f\u5982\u4f55\u6267\u884c\u7684\u3002\u4e0b\u9762\u662fstream\u7684\u4e00\u4e2a\u7c7b\u56fe\u3002\u53ef\u4ee5\u770b\u5230\u521d\u59cb\u5316\u9700\u8981\u4f7f\u7528\u5230\u4e00\u4e2a\u63a5\u53e3\u548c6\u4e2a\u7c7b\u3002\u4e3b\u8981\u5206\u4e3a\u4e09\u5927\u7c7b\u3002<\/p>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
\u7c7b\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
\n\n\n\n
  • \u7b2c\u4e00\u7c7b\u662fArrayList\u7c7b\u548cArrayListSpliterator\u7c7b\u3002<\/li><\/ul>\n\n\n\n
    \u8fd9\u4e24\u4e2a\u7c7b\u662f\u6838\u5fc3\u7c7b\u3002\u6bd5\u7adf\u6211\u4eec\u8f93\u5165\u7c7b\u578b\u662fArrayList\uff0c\u8fd9\u4e2a\u5c31\u4e0d\u7528\u8bf4\u4e86\u3002<\/p>\n\n\n\n
    \u4e3b\u8981\u5728\u4e8eArrayListSpliterator\u8fd9\u4e2a\u7c7b\uff0c\u8fd9\u4e2a\u7c7b\u662fArrayList\u7684\u4e00\u4e2a\u5185\u90e8\u7c7b\u3002\u6700\u4e3b\u8981\u7684\u64cd\u4f5c\u65b9\u6cd5\u548c\u6570\u636e\u90fd\u5728\u91cc\u9762\u3002\u770b\u4e00\u4e0b\u51e0\u4e2a\u5c5e\u6027<\/p>\n\n\n\n
        list \u6211\u4eec\u8981\u8fdb\u884cstream\u64cd\u4f5c\u7684list\n    fence \u5927\u5c0f\n    expectedModCount \u671f\u671b\u7684\u5904\u7406\u6570\u91cf\n    index<\/pre>\n\n\n\n
    \u6700\u4e3b\u8981\u7684\u5faa\u73af\u5904\u7406\u65b9\u6cd5\u540c\u6837\u5728\u8fd9\u4e2a\u7c7b\u91cc\u9762\u3002\u5904\u7406\u903b\u8f91\u5168\u90e8\u5728forEachRemaining<\/code>\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u3002<\/p>\n\n\n\n
    • \u7b2c\u4e8c\u5927\u7c7b\u662fStreamSupport<\/code>\u6d41\u7684\u652f\u6301\u7c7b\uff0c\u7b97\u662f\u4e00\u4e2a\u5355\u72ec\u7684\u7c7b\uff0c\u63d0\u4f9b\u4e86\u5bf9stream\u7684\u4e00\u4e9b\u64cd\u4f5c\u65b9\u6cd5\uff0c\u6bd4\u5982\u521d\u59cb\u5316\u4e00\u4e2astream\u3002<\/li><\/ul>\n\n\n\n
      • \u7b2c\u4e09\u5927\u7c7b\u662fAbstractPipeline\u62bd\u8c61\u7c7b\u4e3a\u4e3b\u76843\u4e2a\u7c7b\uff0c\u8fd8\u6709\u4e24\u4e2a\u662f\u7ee7\u627f\u81eaAbstractPipeline\u7684ReferencePipeline\u7c7b\uff0c\u4e3b\u8981\u8d1f\u8d23\u5904\u7406\u5f15\u7528\u7c7b\u7684\u6d41\u3002\u548c\u7ee7\u627fReferencePipeline\u7684Head\u7c7b\uff0c\u5b9e\u73b0\u4e86\u53cc\u5411\u94fe\u8868\u7684\u5934\u8282\u70b9\u3002\u4ed6\u4eec\u7684\u4e3b\u8981\u529f\u80fd\u5c31\u662f\u6784\u9020\u4e3a\u6d41\u7684\u53cc\u5411\u94fe\u8868\u6570\u636e\u7ed3\u6784\u3002<\/li><\/ul>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        \u6267\u884c\u6d41\u7a0b\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        \u8fd9\u51e0\u4e2a\u7c7b\u7684\u6267\u884c\u65f6\u5e8f\u56fe\u5982\u4e0b\u3002<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        \u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230\uff0c\u901a\u8fc7Collection\u7c7b\u7684stream\u65b9\u6cd5\u8c03\u7528\u5230\u4e86ArrayList\u7684\u65b9\u6cd5\u7136\u540e\u8c03\u7528\u5230\u4e86ArrayListSpliterator\u7684\u65b9\u6cd5\uff0c\u6765\u521d\u59cb\u5316\u4e86ArrayListSpliterator\u5bf9\u8c61\uff0c\u5e76\u5b58\u50a8\u5230\u6d41\u4e2d\u3002<\/p>\n\n\n\n
        \u63a5\u4e0b\u6765Collection\u7c7b\u5c06\u521d\u59cb\u5316\u597d\u7684ArrayListSpliterator\u5bf9\u8c61\u4f20\u9012\u7ed9\u4e86StreamSupport\u7c7b\u7528\u6765\u521d\u59cb\u5316stream\u3002<\/p>\n\n\n\n
        StreamSupport\u5c06\u4f1a\u521b\u5efa\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u7684\u5934\u8282\u70b9\u3002\u5e76\u5c06ArrayListSpliterator\u5bf9\u8c61\u653e\u5165\u5934\u8282\u70b9\u3002\u521d\u59cb\u5316\u4ee5\u540e\u7684\u6d41\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n

        <\/p>\n\n\n\n
        \u6d41\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        \u6d41\u5206\u4e3a\u4e24\u79cd\uff0c\u987a\u5e8f\u6d41\u548c\u5e76\u884c\u6d41\u3002<\/p>\n\n\n\n
        \u987a\u5e8f\u6d41<\/strong><\/p>\n\n\n\n
        \u987a\u5e8f\u6d41\u987e\u540d\u601d\u4e49\u5c31\u662f\u6309\u7167\u987a\u5e8f\u6267\u884c\u3002\u53ef\u4ee5\u76f4\u63a5\u7684\u7c7b\u6bd4\u4e3afor\u5faa\u73af\u3002\u5982\u4e0b\u56fe\uff0c\u5982\u679c1\uff0c2\uff0c3\u4e09\u4e2a\u5143\u7d20\uff0c\u8fdb\u5165\u6d41\u4ee5\u540e\uff0c\u4f9d\u7136\u662f1,2,3\u4e09\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        \u5e76\u884c\u6d41<\/strong><\/p>\n\n\n\n
        \u5e76\u884c\u6d41\u662f\u5145\u5206\u7684\u5229\u7528\u73b0\u4ee3\u591a\u6838\u8ba1\u7b97\u673a\u7684\u6027\u80fd\u800c\u51fa\u7684\u3002\u5b83\u53ef\u4ee5\u628a\u6d41\u5206\u6563\u5230\u5404\u4e2a\u8fdb\u7a0b\/\u7ebf\u7a0b\u4e2d\u53bb\u6267\u884c\u3002\u6765\u8fbe\u5230\u5e76\u884c\u6267\u884c\u7684\u6548\u679c\u3002\u5982\u4e0b\u56fe\uff0c1\uff0c2\uff0c3\u4e09\u4e2a\u5143\u7d20\uff0c\u53ef\u80fd\u4f1a\u8fdb\u51652\u4e2a\u6d41\u4e2d\u3002<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        \u6e90\u7801\u5206\u6790<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        list\u7684stream\u65b9\u6cd5\u8c03\u7528\u7684\u662fCollection\u7c7b\u7684stream\u65b9\u6cd5\u3002\u6240\u4ee5\u9996\u5148\u6765\u770b\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u987a\u5e8f\u6d41\uff0c\u987a\u5e8f\u6d41\u4e2d\u5305\u542b\u4e86list\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002<\/p>\n\n\n\n
        \/\/\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u987a\u5e8f\u6d41\uff0c\u987a\u5e8f\u6d41\u4e2d\u5305\u542b\u4e86list\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002\ndefault Stream<E> stream() {\n    \/\/\u8c03\u7528\u4e86StreamSupport.stream\u65b9\u6cd5\uff0c\u4f20\u5165\u4e86\u4e00\u4e2a\u5206\u5272\u8fed\u4ee3\u5668\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570false\u4ee3\u8868\u662f\u987a\u5e8f\u6d41\uff0ctrue\u662f\u5e73\u884c\u6d41\u3002\n    return StreamSupport.stream(spliterator(), false);\n}\n\n\/\/\u751f\u6210\u4e00\u4e2a\u5206\u5272\u8fed\u4ee3\u5668\uff0c\u8be5\u65b9\u6cd5\u662fArrayList\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3002\n@Override\npublic Spliterator<E> spliterator() {\n    \/\/\u8fd4\u56de\u4e00\u4e2aArrayListSpliterator\u7c7b\u7684\u5b9e\u4f8b\u3002\n    \/\/\u5b9e\u4f8b\u4e2d\u5305\u542b4\u4e2a\u5c5e\u6027\n    \/\/list = list\n    \/\/index = 0\n    \/\/fence = -1\n    \/\/expectedModCount = 0\n    return new ArrayListSpliterator<>(this, 0, -1, 0);\n}\n\n<\/pre>\n\n\n\n
        \u63a5\u4e0b\u6765\u6765\u5230StreamSupport\u7c7b\u7684stream\u65b9\u6cd5\u3002\u901a\u8fc7spliterator\u6765\u521b\u5efa\u4e00\u4e2a\u987a\u5e8f\u6d41\u3002\u53ea\u6709\u5f53\u7ed3\u679c\u6001\u64cd\u4f5c\u5f00\u59cb\u540e\uff0cspliterator\u624d\u4f1a\u771f\u6b63\u5f00\u59cb\u8fd0\u884c<\/p>\n\n\n\n
        \/**\n*  \u901a\u8fc7spliterator\u6765\u521b\u5efa\u4e00\u4e2a\u987a\u5e8f\u6d41\u6216\u8005\u5e76\u884c\u6d41\uff0c\u5982\u679cparallel=1\u5c31\u662f\u5e76\u884c\u6d41\n*  \u53ea\u6709\u5f53\u7ed3\u679c\u6001\u64cd\u4f5c\u5f00\u59cb\u540e\uff0cspliterator\u624d\u4f1a\u771f\u6b63\u5f00\u59cb\u8fd0\u884c\n*  spliterator\u9700\u8981\u5177\u6709\u4e0d\u53ef\u53d8\u6027\uff0c\u5e76\u53d1\u6027\u6216\u5ef6\u8fdf\u7ed1\u5b9a\u6027\u3002\n*  \u5f53\u524d\u7684spliterator\u5c31\u662f\u4e0a\u9762\u751f\u6210\u7684ArrayListSpliterator\u5bf9\u8c61\u3002\u4e14\u5305\u542b\u4e0a\u9762\u8bf4\u76844\u4e2a\u5c5e\u6027\u3002\n**\/\npublic static <T> Stream<T> stream(Spliterator<T> spliterator, boolean parallel) {\n    \/\/\u53c2\u6570\u6821\u9a8c\n    Objects.requireNonNull(spliterator);\n    \/\/\u8fd4\u56de\u4e00\u4e2aReferencePipeline.Head\u7c7b\u578b\u7684\u5934\u8282\u70b9\n    return new ReferencePipeline.Head<>(spliterator,\n                                        StreamOpFlag.fromCharacteristics(spliterator),\n                                        parallel);\n}\n<\/pre>\n\n\n\n
        \u5728\u751f\u6210Head\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8c03\u7528\u4e86StreamOpFlag<\/code>\u7c7b\u7684fromCharacteristics<\/code>\u65b9\u6cd5\u3002\u6765\u770b\u4e00\u4e0b\u8fd9\u4e2a\u65b9\u6cd5\u3002
        \u53ef\u4ee5\u770b\u5230\u6709\u4e00\u4e2a\u5224\u65ad\u662f\u5426\u662f\u81ea\u7136\u6392\u5e8f\u7684\uff0c\u5982\u679c\u4e0d\u662f\u81ea\u7136\u6392\u5e8f\u5c31\u4f1a\u8d70\u5230if\u91cc\u9762\uff0c\u4e5f\u5c31\u662f\u4e0d\u4f1a\u5c06spliterator\u6807\u8bb0\u4e3a\u5df2\u6392\u5e8f\u72b6\u6001\u3002
        \u6700\u7ec8\u8fd4\u56de\u7ed3\u679c\u4e3a80<\/p>\n\n\n\n
        \/\/\u5c06spliterator\u7684characteristic bit\u8f6c\u6362\u4e3astream flags\n\/\/\u5f53\u524d\u7684spliterator\u5c31\u662f\u4e0a\u9762\u751f\u6210\u7684 ArrayListSpliterator \u5bf9\u8c61\u3002\u4e14\u5305\u542b\u4e0a\u9762\u8bf4\u76844\u4e2a\u5c5e\u6027\u3002\nstatic int fromCharacteristics(Spliterator<?> spliterator) {\n    \/\/\u8c03\u7528spliterator\u5bf9\u8c61\u7684characteristics\u65b9\u6cd5\u3002\u5177\u4f53\u770b\u4e0b\u9762 \u8fd4\u56de\u7684characteristics = 16464\n    int characteristics = spliterator.characteristics();\n    \/\/ 16464\u548c4\u505a\u6309\u4f4d\u4e0e\uff0c\u5373\u4e24\u4e2a\u90fd\u662f1\u624d\u662f1\uff0c100 0000 0101 0000 & 100 = 000 0000 0000 0000 = 0\u8bf4\u660e\u4e0d\u6ee1\u8db3\u7b2c\u4e00\u4e2a\u6761\u4ef6\uff0c\u89e6\u53d1\u77ed\u8def\uff0c\u8d70else\n    if ((characteristics & Spliterator.SORTED) != 0 && spliterator.getComparator() != null) {\n        \/\/ Do not propagate the SORTED characteristic if it does not correspond\n        \/\/ to a natural sort order\n        \/\/ \u5982\u679c\u4e0d\u662f\u81ea\u7136\u6392\u5e8f\u7684\uff0c\u5219\u4e0d\u4f20\u64ad\u6709\u5e8f\u72b6\u6001\u3002\n        return characteristics & SPLITERATOR_CHARACTERISTICS_MASK & ~Spliterator.SORTED;\n    }\n    else {\n        \/\/\u5c0616464\u548c85\u505a\u6309\u4f4d\u4e0e\uff0c100 0000 0101 0000 & 0101 0101 = 000 0000 0101 0000 = 80\n        \/\/\u8fd4\u56de80\n        return characteristics & SPLITERATOR_CHARACTERISTICS_MASK;\n    }\n}\n\n\/\/ArrayListSpliterator\u7c7b\u7684characteristics\u65b9\u6cd5\u3002\n\/\/\u4e09\u4e2a\u6570\u505a\u6309\u4f4d\u6216\uff0c\u5373\u67091\u5c31\u662f1\uff0c\u7ed3\u679c\u662f 100 0000 0101 0000 = 16464\npublic int characteristics() {\n    \/\/Spliterator.ORDERED = 16 = 1 0000\n    \/\/Spliterator.SIZED = 64 = 100 0000\n    \/\/Spliterator.SUBSIZED = 16384 = 100 0000 0000 0000\n    return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;\n}\n\n<\/pre>\n\n\n\n
        \u63a5\u4e0b\u6765\u770bHead<\/code>\u7c7b\uff0c\u5b83\u662fReferencePipeline<\/code>\u7c7b\u7684\u4e00\u4e2a\u5185\u90e8\u7c7b\u3002\u4e3b\u8981\u4f5c\u7528\u662f\u5934\u8282\u70b9\u7684\u4e00\u4e9b\u5c5e\u6027\u548c\u64cd\u4f5c\u3002\u5305\u62ec\u751f\u6210\u5934\u8282\u70b9\u7b49\u3002<\/p>\n\n\n\n
        \nstatic class Head<E_IN, E_OUT> extends ReferencePipeline<E_IN, E_OUT> {\n    \/\/\u8fd9\u4e2a\u662f\u53cc\u5411\u94fe\u8868\u7684\u5934\u8282\u70b9\u3002\u4e5f\u5c31\u662f\u628a\u6700\u5148\u521b\u5efa\u7684\u521d\u59cb\u6d41\u4f5c\u4e3a\u5934\u8282\u70b9\u3002\n    \/\/\u4e09\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570source = ArrayListSpliterator\u5bf9\u8c61\n    \/\/\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6d41\u7684\u6807\u5fd7\uff0c80\n    \/\/\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u5426\u5e76\u884c\u6d41 0\n    Head(Spliterator<?> source,\n            int sourceFlags, boolean parallel) {\n        \/\/\u8c03\u7528\u4e86\u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff0c\u5c31\u662fReferencePipeline\u7684\u6784\u9020\u65b9\u6cd5\u3002\u5728\u4e0b\u9762\u3002\n        super(source, sourceFlags, parallel);\n    }\n}\n\n\n\/\/ReferencePipeline\u7684\u6784\u9020\u65b9\u6cd5\u3002\u53c2\u6570\u540c\u4e0a\uff0c\u4e0d\u518d\u63cf\u8ff0\u3002\nReferencePipeline(Spliterator<?> source,\n                    int sourceFlags, boolean parallel) {\n    \/\/\u518d\u6b21\u8c03\u7528\u4e86\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u3002ReferencePipeline\u7684\u7236\u7c7b\u662fAbstractPipeline\u7c7b\uff0c\u653e\u5728\u4e0b\u9762\u4e86\u3002\n    super(source, sourceFlags, parallel);\n}\n\n\/\/AbstractPipeline\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u3002\u6784\u9020\u4e00\u4e2astream\u7684\u5934\u8282\u70b9\u3002\nAbstractPipeline(Spliterator<?> source,\n                     int sourceFlags, boolean parallel) {\n    \/\/\u5934\u8282\u70b9\u7684\u5934\u6307\u9488\u4e3a\u7a7a\u3002\n    this.previousStage = null;\n    \/\/\u6570\u636e = ArrayListSpliterator\u5bf9\u8c61\n    this.sourceSpliterator = source;\n    \/\/\u5934\u8282\u70b9\u7684\u6570\u636e \u6307\u5411\u81ea\u5df1\u3002\n    this.sourceStage = this;\n    \/\/\u6807\u5fd7\u4f4d = 80 & 85 = 80 \u4e8c\u8fdb\u5236 0101 0000 & 0101 0101 = 0101 0000 = 80\n    this.sourceOrOpFlags = sourceFlags & StreamOpFlag.STREAM_MASK;\n    \/\/ The following is an optimization of:\n    \/\/ StreamOpFlag.combineOpFlags(sourceOrOpFlags, StreamOpFlag.INITIAL_OPS_VALUE);\n    \/\/sourceOrOpFlags << 1 = 160  \u5de6\u79fb\u4e00\u4f4d\u5c31\u662f * 2\n    \/\/\uff5e160 = -161  \u6309\u4f4d\u53bb\u53cd\n    \/\/ -161 & 255 = 95\n    \/\/ combinedFlags = 95\n    this.combinedFlags = (~(sourceOrOpFlags << 1)) & StreamOpFlag.INITIAL_OPS_VALUE;\n    \/\/ \u53cc\u5411\u94fe\u8868\u6df1\u5ea6 = 0 \uff0c\u56e0\u4e3a\u73b0\u5728\u53ea\u6709\u5934\u8282\u70b9\u3002\n    this.depth = 0;\n    \/\/ \u662f\u5426\u5e76\u884c\u6d41 = 0 \u4e0d\u662f\n    this.parallel = parallel;\n}\n<\/pre>\n\n\n\n
        list.stream()\u51fd\u6570\u7684\u6e90\u7801\u5c31\u5b8c\u4e86\u3002\u4e3b\u8981\u8c03\u7528\u4e86\u6784\u9020\u51fd\u6570\uff0c\u6784\u9020\u4e86\u4e00\u4e2a\u542b\u6709list\u6570\u636e\u7684\u5934\u8282\u70b9\uff0c\u5934\u6307\u9488\u6307\u5411\u7a7a\uff0cnext\u6307\u9488\u6307\u5411\u81ea\u5df1\u3002\u5b8c\u6210\u4e86\u6d41\u7684\u521d\u59cb\u5316\u3002\u5f53\u524d\u6570\u636e\u7ed3\u6784\u5982\u4e0b\u3002<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        stream\u7684\u4e2d\u95f4\u6001<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        \u4e2d\u95f4\u6001\u7684\u5177\u4f53\u6e90\u7801\u548c\u6d41\u7a0b\u5728\u540e\u9762\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u53ea\u4ecb\u7ecd\u4e2d\u95f4\u6001\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n
        \u4e2d\u95f4\u6001\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u6784\u5efa\u53cc\u5411\u94fe\u8868\u7684\u4e2d\u95f4\u8282\u70b9\u3002\u4e00\u4e2a\u64cd\u4f5c\u5bf9\u5e94\u4e00\u4e2a\u8282\u70b9\u3002\u6bd4\u5982map\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\u3002\u5176\u4e2dpre\u6307\u9488\u6307\u5411\u524d\u4e00\u4e2a\u8282\u70b9\u4e5f\u5c31\u662f\u5934\u8282\u70b9\u3002\u800c\u5934\u8282\u70b9\u7684next\u6307\u9488\u6307\u5411map\u8282\u70b9\u3002<\/p>\n\n\n\n
        filter\u64cd\u4f5c\u7684\u65f6\u5019\u540c\u6837\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\uff0cpre\u6307\u9488\u6307\u5411\u4e0a\u4e00\u4e2a\u64cd\u4f5c\u4e5f\u5c31\u662fmap\u8282\u70b9\u3002map\u8282\u70b9\u7684next\u6307\u9488\u6307\u5411filter\u8282\u70b9\u3002<\/p>\n\n\n\n
        \u6bcf\u4e2a\u4e2d\u95f4\u6001\u8282\u70b9\u4e2d\u90fd\u5b58\u50a8\u4e86\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u4e2d\u95f4\u6001\u7684\u65f6\u5019\u4f20\u5165\u7684\u51fd\u6570\u3002\u800c\u6570\u636e\u5219\u5168\u90e8\u5728\u5934\u8282\u70b9\u4e2d\u3002<\/p>\n\n\n\n
        \u6bd4\u5982\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n\n\n\n
        \"\"<\/figure><\/div>\n\n\n\n
        \u6bcf\u4e2a\u4e2d\u95f4\u6001\u8282\u70b9\u5176\u5b9e\u53c8\u5206\u6210\u4e24\u79cd<\/p>\n\n\n\n
        • \u6709\u72b6\u6001\u8282\u70b9<\/li>
        • \u65e0\u72b6\u6001\u8282\u70b9<\/li><\/ul>\n\n\n\n
          \u7c7b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n
          \"\"<\/figure><\/div>\n\n\n\n
          stream\u7684\u7ed3\u679c\u6001<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \u7ed3\u679c\u6001\u7684\u5177\u4f53\u6e90\u7801\u548c\u6d41\u7a0b\u5728\u540e\u9762\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u53ea\u4ecb\u7ecd\u7ed3\u679c\u6001\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n
          \u7ed3\u679c\u6001\u7684\u4e3b\u8981\u4f5c\u7528\u6709\u4e09\u4e2a<\/p>\n\n\n\n
          1. \u6784\u9020\u7ed3\u679c\u6001\u8282\u70b9<\/li>
          2. \u6784\u9020sink\u94fe\u8868<\/li>
          3. \u6267\u884c\u6d41\u3002<\/li><\/ol>\n\n\n\n
            \u5148\u8bf4\u7b2c\u4e00\u4e2a\uff0c\u7ed3\u679c\u6001\u8282\u70b9\u662fReduceOp\u5bf9\u8c61\u3002\u8fd9\u4e2a\u7ed3\u679c\u6001\u8282\u70b9\u4e2d\u5305\u542b\u4e86\u4e00\u4e2amakeSink\u65b9\u6cd5\uff0c\u7528\u6765\u6784\u5efa\u7ed3\u679c\u6001\u7684sink\u8282\u70b9\u3002\u7ed3\u679c\u6001\u7684sink\u8282\u70b9\u662f\u4e00\u4e2aReducingSink\u5bf9\u8c61\u3002<\/p>\n\n\n\n
            \u7b2c\u4e8c\u4e2a\uff0c\u5f53\u7ed3\u679c\u6001\u8282\u70b9\u548c\u7ed3\u679c\u6001\u7684sink\u8282\u70b9\u6784\u9020\u5b8c\u6210\u4ee5\u540e\u3002\u63a5\u4e0b\u6765\u4f1a\u6839\u636e\u4e4b\u524d\u6784\u5efa\u597d\u7684\u53cc\u5411\u94fe\u8868\u6765\u751f\u6210\u5bf9\u5e94\u7684sink\u94fe\u8868\u3002<\/p>\n\n\n\n
            \u4e00\u5f00\u59cb\u7684\u53cc\u5411\u94fe\u8868\u6211\u4eec\u77e5\u9053\u662f\u8fd9\u6837\u7684
            <\/p>\n\n\n\n
            \"\"<\/figure><\/div>\n\n\n\n
            \u800csink\u94fe\u8868\u5219\u662f\u53cd\u8fc7\u6765\u4e86\uff0c\u6839\u636e\u53cc\u5411\u94fe\u8868\u4ece\u540e\u5411\u524d\u901a\u8fc7pre\u6307\u9488\u4e0d\u65ad\u5411\u524d\uff0c\u628a\u6bcf\u4e2a\u8282\u70b9\u5305\u88f9\u5728sink\u8282\u70b9\u4e2d\u5e76\u901a\u8fc7downstream<\/code>\u6307\u9488\u6765\u6307\u5411\u4e0b\u4e2a\u8282\u70b9\u3002\u8fd9\u91cc\u56e0\u4e3a\u5728\u7b2c\u4e00\u6b65\u7684\u65f6\u5019\u628a\u6e90\u6570\u636e\u53d6\u51fa\u6765\u4e86\uff0c\u6240\u4ee5sink\u4e2d\u4e0d\u5305\u542b\u5934\u8282\u70b9\u3002\u521b\u5efa\u5b8c\u540e\u5982\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
            \"\"<\/figure><\/div>\n\n\n\n
            \u7b2c\u4e09\u6b65\u624d\u662f\u771f\u6b63\u7684\u6267\u884c\u6d41\u3002\u6839\u636esink\u94fe\u8868\u6765\u6267\u884c\uff0c\u6bcf\u6b21\u628a\u5143\u7d20\u4f20\u9012\u7ed9\u7b2c\u4e00\u4e2asink\u4e5f\u5c31\u662fmap\u64cd\u4f5c\uff0c\u5f53\u7b2c\u4e00\u4e2asink\u8282\u70b9\u5904\u7406\u5b8c\u4ee5\u540e\u901a\u8fc7downstream\u6d41\u52a8\u5230\u4e0b\u4e00\u4e2asink\u8282\u70b9\u6267\u884c\u3002\u4e0d\u65ad\u901a\u8fc7downsteram\u6d41\u52a8\uff0c\u76f4\u5230\u6700\u540e\u5230\u7ed3\u679c\u6001\u7684sink\u6267\u884c\u5b8c\u4ee5\u540e\u3002\u518d\u6b21\u628a\u7b2c\u4e8c\u4e2a\u5143\u7d20\u8fdb\u884c\u6d41\u52a8\u6267\u884c\u3002\u76f4\u81f3\u6240\u6709\u5143\u7d20\u6267\u884c\u5b8c\u6bd5\u3002<\/p>\n\n\n\n

            \u603b\u7ed3<\/strong><\/p>\n\n\n\n
            \n\n\n\n
            \u56e0\u4e3a\u662f\u901a\u8fc7\u81ea\u9876\u5411\u4e0b\u7684\u65b9\u5f0f\u6765\u4e86\u89e3stream\u3002\u6240\u4ee5\u8fd9\u91cc\u4e3b\u8981\u4ecb\u7ecd\u4e86stream\u7684\u6267\u884c\u6d41\u7a0b\u548c\u521d\u59cb\u5316\u7684\u6e90\u7801\u5206\u6790\u3002\u4e2d\u95f4\u6001\u548c\u7ed3\u679c\u6001\u7684\u6e90\u7801\u5206\u6790\u653e\u5728\u4e86\u540e\u9762\u3002<\/p>\n\n\n\n
            \u5728\u6267\u884c\u6d41\u7a0b\u4e2d\u53ef\u4ee5\u770b\u5230\u3002\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\uff0c\u7136\u540e\u5728\u6839\u636e\u53cc\u5411\u94fe\u8868\u521b\u5efa\u4e86sink\u94fe\u8868\u3002\u6700\u540e\u901a\u8fc7sink\u94fe\u8868\u8fdb\u884c\u6267\u884c\u6d41\u7684\u64cd\u4f5c\u3002\u4e5f\u53ef\u4ee5\u770b\u51fa\u6765\u786e\u5b9e\u662f\u6d41\u52a8\uff0c\u4f20\u64ad\uff0c\u5145\u6ee1\u4e86stream\u7684\u5473\u9053\u3002<\/p>\n\n\n\n
            \u4ece\u8fd9\u91cc\u4e5f\u80fd\u770b\u51fa\u6765\u4e3a\u4f55\u4e00\u5f00\u59cb\u662f\u53cc\u5411\u94fe\u8868\u800c\u4e0d\u662f\u5355\u5411\u7684\uff0c\u56e0\u4e3a\u8981\u901a\u8fc7pre\u6307\u9488\u6784\u9020sink\u94fe\u8868\u3002<\/p>\n\n\n\n
            \u4f46\u662f\u8fd9\u91cc\u5c31\u6709\u4e00\u4e2a\u95ee\u9898\u4e86\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u7528\u4e00\u5f00\u59cb\u7684\u53cc\u5411\u94fe\u8868\uff0c\u800c\u8981\u5728\u521b\u5efa\u4e00\u4e2asink\u94fe\u8868\u5462\uff1f<\/p>\n\n\n\n
            \u6211\u4e2a\u4eba\u89c9\u5f97\u6709\u51e0\u4e2a\u539f\u56e0\uff1a<\/p>\n\n\n\n
            • \u56e0\u4e3a\u5f53\u524d\u5904\u4e8e\u7ed3\u679c\u6001\u8282\u70b9\uff0c\u60f3\u4ece\u5934\u6d41\u52a8\u6267\u884c\uff0c\u9700\u8981\u5f53\u524d\u6307\u9488\u5148\u6307\u5411\u5934\u8282\u70b9\uff0c\u6240\u4ee5\u5fc5\u987b\u904d\u5386\u4e00\u904d\u3002<\/li>
            • \u91cd\u65b0\u6784\u5efa\u4e00\u4e2a\u7eaf\u51c0\u7684sink\u94fe\u8868\uff0c\u6765\u8fbe\u5230\u4e0d\u53d8\u6027\u7684\u6027\u8d28\u3002\u4fdd\u6301\u4e4b\u524d\u7684\u6570\u636e\u548c\u8282\u70b9\u7b49\u4e0d\u53ef\u53d8\u3002<\/li>
            • \u53cc\u5411\u94fe\u8868\u53ea\u8d1f\u8d23\u5b58\u50a8\u6570\u636e\u548c\u64cd\u4f5c\u3002\u771f\u6b63\u7684\u6267\u884c\u901a\u8fc7sink\u94fe\u8868\u6765\u6267\u884c\uff0c\u8fbe\u5230\u5355\u4e00\u804c\u8d23\u548c\u5206\u5c42\u6e05\u6670\u3002<\/li>
            • \u5176\u4e2d\u6216\u8bb8\u8fd8\u6709\u5e76\u884c\u6d41\u5e76\u53d1\u7684\u95ee\u9898\u3002<\/li><\/ul>\n\n\n\n

              <\/p>\n","protected":false},"excerpt":{"rendered":"
              stream stream\u662fjava8\u65b0\u589e\u7684\u975e\u5e38\u91cd\u8981\u7684\u4e00\u4e2a\u7279\u6027\u3002\u5e76\u4e14\u975e\u5e38\u7684\u5e38\u7528\u3002\u5b83\u5b9e\u73b0\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002\u5177\u4f53\u51fd\u6570\u5f0f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/12819"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12819"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/12819\/revisions"}],"predecessor-version":[{"id":12834,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/12819\/revisions\/12834"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12819"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}