{"id":31015,"date":"2024-01-06T16:00:05","date_gmt":"2023-09-12T18:10:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e9%87%91%e7%89%8c%f0%9f%a5%87%e3%80%91%e6%94%b6%e9%9b%86%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88java-se-11-%ef%bc%89\/"},"modified":"2025-08-12T21:52:35","modified_gmt":"2025-08-12T13:52:35","slug":"%e3%80%90java%e9%87%91%e7%89%8c%f0%9f%a5%87%e3%80%91%e6%94%b6%e9%9b%86%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88java-se-11-%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e9%87%91%e7%89%8c%f0%9f%a5%87%e3%80%91%e6%94%b6%e9%9b%86%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88java-se-11-%ef%bc%89\/","title":{"rendered":"\u3010Java\u91d1\u724c\ud83e\udd47\u3011\u6536\u96c6\u5668\u7684\u4f7f\u7528\u65b9\u6cd5\uff08Java SE 11 -\uff09"},"content":{"rendered":"

\u4f7f\u7528java.util.stream.Collector\u53ef\u4ee5\u6709\u6548\u5730\u8fdb\u884c\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u4e4b\u95f4\u7684\u8ba1\u7b97\u5904\u7406\uff08\u5982\u8ba1\u7b97\u6570\u5217\u7684\u603b\u548c\u7b49\uff09\u3002<\/p>\n

\u6211\u60f3\u8981\u63d0\u9ad8\u603b\u548c\u8ba1\u7b97\u7684\u6548\u7387\u3002Q. \u8981\u4f7f3\u4e2a\u4eba\u9ad8\u6548\u5730\uff08\u5c3d\u53ef\u80fd\u51cf\u5c11\u8ba1\u7b97\u6b65\u9aa4\uff09\u5206\u5de5\u8ba1\u7b97\u7531\u52a0\u53f7\u8fde\u63a5\u7684\u8868\u8fbe\u5f0f $1+2+ \\cdots +10$\uff0c\u5e94\u8be5\u600e\u4e48\u505a\u5462\uff1f
\nA. \u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8868\u683c\u4e2d\u7684 “\u5e76\u884c\u5904\u7406\u4f18\u5316” \u6765\u8ba1\u7b97\uff0c\u53ea\u97004\u4e2a\u6b65\u9aa4\u5373\u53ef\u3002<\/p>\n
\n
\u8a08\u7b97\u8005\uff3c\u30b9\u30c6\u30c3\u30d7\u65701234A$a_1=1+2$$a_2=a_1+3$$a_3=a_2+b_2$$\\sigma=a_3+c_3$B$b_1=4+5$$b_2=b_1+6$–C$c_1=7+8$$c_2=c_1+9$$c_3=c_2+10$-\u8fd9\u79cd\u6548\u7387\u5316\u662f\u6307\u5c06\u7ed9\u5b9a\u7684\u8868\u8fbe\u5f0f
\n$\\sigma = 1+2+3+4+5+6+7+8+9+10$
\n\u5206\u89e3\u4e3a
\n$\\sigma = (((1+2)+3)+((4+5)+6))+(((7+8)+9)+10)$
\n\u5e76\u5bf9\u8868\u8fbe\u5f0f\u8fdb\u884c\u4e86\u4e00\u4e9b\u5206\u7ec4\u8ba1\u7b97\u3002<\/p>\n

\u5e94\u7528\u4e8e\u5e38\u89c4\u5904\u7406\u65b9\u6cd5\u4e2d\u5bf9\u4e8e\u4f7f\u7528\u4e0d\u662f\u52a0\u53f7\u7684\u8fd0\u7b97\u7b26\u8fde\u63a5\u7684\u8868\u8fbe\u5f0f\uff0c\u80fd\u5426\u4f7f\u7528\u76f8\u540c\u7684\u201c\u5e76\u884c\u5904\u7406\u4ee5\u63d0\u9ad8\u6548\u7387\u201d\u5462\uff1f\u8ba9\u6211\u4eec\u6765\u8003\u8651\u4e00\u822c\u5316\u7684\u8fd0\u7b97\u7b26$\\circ$\u3002<\/p>\n

\u5728\u6f14\u7b97\u4e2d\uff0c\u66ff\u4ee3\u6c42\u548c\u8fd0\u7b97\u7684\u8ba1\u7b97\uff08\u5904\u7406\uff09\u8868\u793a\u4e3a$X = a_1 \\circ a_2 \\circ \\cdots \\circ a_n$\u3002<\/p>\n

\u4e3a\u4e86\u5b9e\u65bd\u4e4b\u524d\u63d0\u5230\u7684\u6548\u7387\u5316\u65b9\u6cd5\uff0c\u5fc5\u987b\u5c06\u8ba1\u7b97\u5206\u5272\u6210\u4e0d\u540c\u7684\u7ec4\u5757\uff0c\u4f46\u6574\u4f53\u7ed3\u679c\u4e0d\u5e94\u8be5\u6539\u53d8\u3002\u56e0\u6b64\uff0c\u6f14\u7b97$\\circ$\u88ab\u79f0\u4e3a\u201c\u901a\u8fc7\u5e76\u884c\u5904\u7406\u5b9e\u73b0\u6548\u7387\u5316\u201d\u7684\u6761\u4ef6\u662f\u6ee1\u8db3\u7ed3\u5408\u5f8b$(a\\circ b)\\circ c = a\\circ (b\\circ c)$\u3002<\/p>\n

\u53ea\u8981\u6ee1\u8db3\u7ed3\u5408\u6cd5\u5219\uff0c\u4efb\u4f55\u8fd0\u7b97\u90fd\u53ef\u4ee5\u901a\u8fc7\u8fd0\u7b97\u7b26\u8fde\u63a5\u7684\u8868\u8fbe\u5f0f\u8fdb\u884c\u201c\u5e76\u884c\u5904\u7406\u4ee5\u63d0\u9ad8\u6548\u7387\u201d\u3002<\/p>\n

\u4f7f\u7528Collector\u8ba1\u7b97\u6c42\u548c\u8868\u8fbe\u5f0f\u3002\u901a\u8fc7\u5c06Stream\u548cCollector\u7ec4\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u5b9e\u73b0\u201c\u5e76\u884c\u5904\u7406\u7684\u6548\u7387\u63d0\u5347\u201d\u3002
\n\u8981\u521b\u5efaCollector\u5b9e\u4f8b\uff0c\u9700\u8981\u786e\u5b9a\u4ee5\u4e0b\u8868\u683c\u4e2d\u7684\u4e09\u79cd\u7c7b\u578b\uff0c\u5e76\u5b9a\u4e49\u76f8\u5e94\u7684\u56db\u4e2a\u64cd\u4f5c\u3002<\/p>\n

\u4f7f\u7528\u4e09\u79cd\u7c7b\u578b<\/p>\n

\n
\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u5185\u5bb9\u7dcf\u548c\u8a08\u7b97\u3067\u3044\u3046\u3068\u2026T<\/code>\u51e6\u7406\u306e\u5165\u529b\u8981\u7d20\u306e\u578b$1,2,\\cdots$\u3068\u3044\u3063\u305f\u6570\u5024A<\/code>\u51e6\u7406\u306e\u4e2d\u9593\u72b6\u614b\u3092\u4fdd\u6301\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b$(1+2)$\u3068\u3044\u3063\u305f\u90e8\u5206\u7684\u6f14\u7b97\u7d50\u679cR<\/code>\u51e6\u7406\u7d50\u679c\u306e\u578b\u7dcf\u548c\u8a08\u7b97\u306e\u7d50\u679c\u306e\u6570\u5024\u5b9e\u65bd\u7684\u56db\u4e2a\u64cd\u4f5c<\/p>\n
\n
\u51e6\u7406\u540d\u578b\u5165\u529b\u51fa\u529b\u51e6\u7406\u5185\u5bb9\u7dcf\u548c\u8a08\u7b97\u3067\u3044\u3046\u3068\u2026supplierSupplier<A><\/code>–A<\/code>\u65b0\u3057\u3044\u7d50\u679c\u30b3\u30f3\u30c6\u30ca\u306e\u4f5c\u6210$()$\u306e\u67a0\u3092\u4f5c\u308baccumulatorBiConsumer<A,T><\/code>A<\/code>, T<\/code>-\u7d50\u679c\u30b3\u30f3\u30c6\u30caA<\/code>\u3078\u306e\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u8981\u7d20T<\/code>\u306e\u7d44\u307f\u8fbc\u307f$(1+2)+3$combinerBinaryOperator<A><\/code>A<\/code>,A<\/code>A<\/code>2\u3064\u306e\u7d50\u679c\u30b3\u30f3\u30c6\u30caA<\/code>\u30921\u3064\u306b\u7d50\u5408\u3059\u308b$(1+2)+(3+4)$finisherFunction<A,R><\/code>A<\/code>R<\/code>\u7d50\u679c\u30b3\u30f3\u30c6\u30caA<\/code>\u3092\u6700\u7d42\u7684\u306a\u51fa\u529b\u306b\u5909\u63db\u3059\u308b\u8a08\u7b97\u7d50\u679c\u3092\u51fa\u529b\u3059\u308b\u5b9e\u73b0\u4e86\u56db\u4e2a\u5904\u7406\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528Collector\u5de5\u5382\u65b9\u6cd5of\u6765\u751f\u6210Collector\u5b9e\u4f8b\u3002<\/p>\n
Collector<\/span><<\/span>T<\/span>,<\/span> A<\/span>,<\/span> R<\/span>><\/span> collector<\/span> =<\/span> Collector<\/span>.<\/span>of<\/span>(<\/span>supplier<\/span>,<\/span> accumulator<\/span>,<\/span> combiner<\/span>,<\/span> finisher<\/span>,<\/span>\tcharacteristics<\/span>);<\/span>\r\n<\/code><\/pre>\n
of\u65b9\u6cd5\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u4f3c\u4e4e\u662f\u7528\u4e8e\u5e76\u53d1\u5904\u7406\u7684\u8bbe\u7f6e\u3002
\nCharacteristics.CONCURRENT<\/p>\n
\u7528 Stream \u5c06 $a_1, a_2, \\cdots , a_n$ \u5217\u4f5c\u4e3a\u8f93\u5165\uff0c\u5e76\u4f7f\u7528 Stream \u7684 collect \u65b9\u6cd5\u6267\u884c\u64cd\u4f5c\u5904\u7406\u3002<\/p>\n
Stream<\/span><<\/span>T<\/span>><\/span> stream<\/span>;<\/span>\r\nR<\/span> result<\/span> =<\/span> stream<\/span>.<\/span>collect<\/span>(<\/span>collector<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6574\u6570\u7684\u6c42\u548c\u8ba1\u7b97\u5b9e\u73b0<\/p>\n
class<\/span> Test<\/span> {<\/span>\r\n\tInteger<\/span> calcSum<\/span>(<\/span>List<\/span><<\/span>Integer<\/span>><\/span> list<\/span>)<\/span> {<\/span>\r\n        \/\/ \u7d50\u679c\u30b3\u30f3\u30c6\u30ca<\/span>\r\n\t\tclass<\/span> IntContainer<\/span> {<\/span>\r\n\t\t\tpublic<\/span> int<\/span> value<\/span>;<\/span>\r\n\r\n\t\t\tIntContainer<\/span>()<\/span> {<\/span>\r\n\t\t\t\tthis<\/span>(<\/span>0<\/span>);<\/span>\r\n\t\t\t}<\/span>\r\n\r\n\t\t\tIntContainer<\/span>(<\/span>int<\/span> value<\/span>)<\/span> {<\/span>\r\n\t\t\t\tthis<\/span>.<\/span>value<\/span> =<\/span> value<\/span>;<\/span>\r\n\t\t\t}<\/span>\r\n\t\t}<\/span>\r\n\r\n        \/\/ \u65b0\u3057\u3044\u7d50\u679c\u30b3\u30f3\u30c6\u30ca\u306e\u4f5c\u6210<\/span>\r\n\t\tSupplier<\/span><<\/span>IntContainer<\/span>><\/span> supplier<\/span> =<\/span> IntContainer:<\/span>:<\/span>new<\/span>;<\/span>\r\n\r\n        \/\/ \u7d50\u679c\u30b3\u30f3\u30c6\u30ca`IntContainer`\u3078\u306e\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u8981\u7d20`Integer`\u306e\u7d44\u307f\u8fbc\u307f<\/span>\r\n\t\tBiConsumer<\/span><<\/span>IntContainer<\/span>,<\/span> Integer<\/span>><\/span> accumulator<\/span> =<\/span> (<\/span>container<\/span>,<\/span> i<\/span>)<\/span> -><\/span> container<\/span>.<\/span>value<\/span> +=<\/span> i<\/span>;<\/span>\r\n\r\n        \/\/ 2\u3064\u306e\u7d50\u679c\u30b3\u30f3\u30c6\u30ca`IntContainer`\u30921\u3064\u306b\u7d50\u5408\u3059\u308b<\/span>\r\n\t\tBinaryOperator<\/span><<\/span>IntContainer<\/span>><\/span> combiner<\/span> =<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> new<\/span> IntContainer<\/span>(<\/span>a<\/span>.<\/span>value<\/span> +<\/span> b<\/span>.<\/span>value<\/span>);<\/span>\r\n\r\n        \/\/ \u7d50\u679c\u30b3\u30f3\u30c6\u30ca`IntContainer`\u3092\u6700\u7d42\u7684\u306a\u51fa\u529b\u306b\u5909\u63db\u3059\u308b<\/span>\r\n\t\tFunction<\/span><<\/span>IntContainer<\/span>,<\/span> Integer<\/span>><\/span> finisher<\/span> =<\/span> container<\/span> -><\/span> container<\/span>.<\/span>value<\/span>;<\/span>\r\n\r\n\t\t\/\/ \u4e26\u884c\u51e6\u7406\u3092\u524d\u63d0\u3068\u3059\u308b<\/span>\r\n\t\tCharacteristics<\/span> characteristics<\/span> =<\/span> Characteristics<\/span>.<\/span>CONCURRENT<\/span>;<\/span>\r\n\r\n        \/\/ Collector\u3092\u751f\u6210<\/span>\r\n\t\tCollector<\/span><<\/span>Integer<\/span>,<\/span> IntContainer<\/span>,<\/span> Integer<\/span>><\/span> collector<\/span> =<\/span> Collector<\/span>.<\/span>of<\/span>(<\/span>supplier<\/span>,<\/span> accumulator<\/span>,<\/span> combiner<\/span>,<\/span> finisher<\/span>,<\/span>\tcharacteristics<\/span>);<\/span>\r\n\r\n        \/\/ Collector\u306b\u3088\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b<\/span>\r\n\t\tStream<\/span><<\/span>Integer<\/span>><\/span> stream<\/span> =<\/span> list<\/span>.<\/span>stream<\/span>().<\/span>parallel<\/span>();<\/span>\r\n\t\treturn<\/span> stream<\/span>.<\/span>collect<\/span>(<\/span>collector<\/span>);<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5b9e\u4f8b\uff1a\u4f7f\u7528\u9017\u53f7\u5c06\u591a\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u8d77\u6765\u3002
\n\u8003\u8651\u5c06\u591a\u4e2a\u5b57\u7b26\u4e32\u7528\u9017\u53f7\u5206\u9694\u5e76\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u5904\u7406\u3002
\n\u7531\u4e8e\u5b57\u7b26\u4e32\u8fde\u63a5\u6ee1\u8db3\u7ed3\u5408\u5f8b\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528Collector\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
\u4f7f\u7528StringBuilder\u6bd4\u4f7f\u7528\u5b57\u7b26\u4e32\u8fde\u63a5\u64cd\u4f5c+\u80fd\u591f\u63d0\u9ad8\u5904\u7406\u901f\u5ea6\u3002\u56e0\u6b64\uff0c\u5728\u6b64\u5904\u7406\u4e2d\u5e94\u4f7f\u7528StringBuilder\u6765\u4fdd\u5b58\u4e2d\u95f4\u72b6\u6001\u7684\u5bf9\u8c61\u7c7b\u578bA\u3002<\/p>\n
class<\/span> Test<\/span> {<\/span>\r\n\tString<\/span> test<\/span>()<\/span> {<\/span>\r\n\t\t\/\/ \u51e6\u7406\u306e\u521d\u3081\u306b\u884c\u3046\u521d\u671f\u5316\uff1aStringBuilder\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b<\/span>\r\n\t\tSupplier<\/span><<\/span>StringBuilder<\/span>><\/span> supplier<\/span> =<\/span> ()<\/span> -><\/span> new<\/span> StringBuilder<\/span>();<\/span>\r\n\r\n\t\t\/\/ \u6b21\u306e\u8981\u7d20\u3092\u53d6\u308a\u8fbc\u307f\u51e6\u7406\u3059\u308b\uff1aString\u3092StringBuilder\u306b\u8ffd\u52a0\u3059\u308b<\/span>\r\n\t\tBiConsumer<\/span><<\/span>StringBuilder<\/span>,<\/span> String<\/span>><\/span> accumulator<\/span> =<\/span> (<\/span>sb<\/span>,<\/span> str<\/span>)<\/span> -><\/span> {<\/span>\r\n\t\t\tif<\/span> (<\/span>sb<\/span>.<\/span>length<\/span>()<\/span> ><\/span> 0<\/span>)<\/span>\r\n\t\t\t\tsb<\/span>.<\/span>append<\/span>(<\/span>\", \"<\/span>);<\/span>\r\n\t\t\tsb<\/span>.<\/span>append<\/span>(<\/span>str<\/span>);<\/span>\r\n\t\t};<\/span>\r\n\r\n\t\t\/\/ \u307e\u3068\u307e\u308a\u306e\u51e6\u7406\u3092\u7d50\u5408\u3059\u308b\u51e6\u7406\uff1aStringBuilder\u3069\u3046\u3057\u3092\u9023\u7d50\u3059\u308b<\/span>\r\n\t\tBinaryOperator<\/span><<\/span>StringBuilder<\/span>><\/span> combiner<\/span> =<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> {<\/span>\r\n\t\t\tif<\/span> (<\/span>a<\/span>.<\/span>length<\/span>()<\/span> ><\/span> 0<\/span>)<\/span>\r\n\t\t\t\ta<\/span>.<\/span>append<\/span>(<\/span>\", \"<\/span>);<\/span>\r\n\t\t\treturn<\/span> a<\/span>.<\/span>append<\/span>(<\/span>b<\/span>);<\/span>\r\n\t\t};<\/span>\r\n\r\n\t\t\/\/ \u4e2d\u9593\u751f\u6210\u7269\u3092\u7d50\u679c\u306b\u5909\u63db\u3059\u308b\u51e6\u7406\uff1aStringBuilder\u3067\u6587\u5b57\u5217\u3092\u751f\u6210\u3059\u308b<\/span>\r\n\t\tFunction<\/span><<\/span>StringBuilder<\/span>,<\/span> String<\/span>><\/span> finisher<\/span> =<\/span> sb<\/span> -><\/span> {<\/span>\r\n\t\t\treturn<\/span> sb<\/span>.<\/span>toString<\/span>();<\/span>\r\n\t\t};<\/span>\r\n\r\n\t\t\/\/ \u4e26\u884c\u51e6\u7406\u3092\u524d\u63d0\u3068\u3059\u308b<\/span>\r\n\t\tCharacteristics<\/span> characteristics<\/span> =<\/span> Characteristics<\/span>.<\/span>CONCURRENT<\/span>;<\/span>\r\n\r\n        \/\/ Collector\u3092\u751f\u6210<\/span>\r\n\t\tCollector<\/span><<\/span>String<\/span>,<\/span> StringBuilder<\/span>,<\/span> String<\/span>><\/span> collector<\/span> =<\/span> Collector<\/span>.<\/span>of<\/span>(<\/span>supplier<\/span>,<\/span> accumulator<\/span>,<\/span> combiner<\/span>,<\/span> finisher<\/span>,<\/span> characteristics<\/span>);<\/span>\r\n\r\n        \/\/ Collector\u306b\u3088\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b<\/span>\r\n    \tStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> list<\/span>.<\/span>stream<\/span>().<\/span>parallel<\/span>();<\/span>\r\n\t\treturn<\/span> stream<\/span>.<\/span>collect<\/span>(<\/span>collector<\/span>);<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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