{"id":92017,"date":"2026-08-09T00:40:56","date_gmt":"2026-08-08T16:40:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/92017.html"},"modified":"2026-08-09T00:40:56","modified_gmt":"2026-08-08T16:40:56","slug":"java-stream-collectors-%e5%8a%9f%e8%83%bd%e5%85%a8%e9%9d%a2%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/92017.html","title":{"rendered":"Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357"},"content":{"rendered":"

Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357<\/h2>\n

Collectors \u662f Java Stream API \u4e2d\u6700\u5f3a\u5927\u7684\u5de5\u5177\u4e4b\u4e00，\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6536\u96c6\u5668\u5b9e\u73b0，\u7528\u4e8e\u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u805a\u5408\u4e3a\u5404\u79cd\u7ed3\u679c\u3002<\/p>\n

\n

\u5e38\u7528\u6536\u96c6\u5668<\/h3>\n

1. toList() – \u6536\u96c6\u4e3a\u5217\u8868<\/h4>\n

List<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5c06\u6d41\u5143\u7d20\u6536\u96c6\u5230 List \u4e2d
\n\u8fd4\u56de：ArrayList（\u975e\u7ebf\u7a0b\u5b89\u5168）<\/p>\n

\n

2. toSet() – \u6536\u96c6\u4e3a\u96c6\u5408<\/h4>\n

Set<\/span><<\/span>Integer<\/span>><\/span><\/span> set =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toSet<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5c06\u6d41\u5143\u7d20\u6536\u96c6\u5230 Set \u4e2d（\u81ea\u52a8\u53bb\u91cd）
\n\u8fd4\u56de：HashSet<\/p>\n

\n

3. toMap() – \u6536\u96c6\u4e3a\u6620\u5c04<\/h4>\n

Map<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span><\/span> map =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>toMap<\/span>(<\/span>
\n Function<\/span>.<\/span>identity<\/span>(<\/span>)<\/span>,<\/span> \/\/ key \u6620\u5c04<\/span>
\n Function<\/span>.<\/span>identity<\/span>(<\/span>)<\/span> \/\/ value \u6620\u5c04<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5c06\u6d41\u5143\u7d20\u6536\u96c6\u5230 Map \u4e2d
\n\u6ce8\u610f：\u9700\u8981\u5904\u7406 key \u51b2\u7a81，\u53ef\u901a\u8fc7\u7b2c\u4e09\u4e2a\u53c2\u6570\u6307\u5b9a\u5408\u5e76\u7b56\u7565<\/p>\n

\n

4. joining() – \u5b57\u7b26\u4e32\u8fde\u63a5<\/h4>\n

String<\/span> result =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>joining<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n\/\/ \u5e26\u5206\u9694\u7b26<\/span>
\nString<\/span> result =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>joining<\/span>(<\/span>", "<\/span>)<\/span>)<\/span>;<\/span>
\n\/\/ \u5e26\u5206\u9694\u7b26\u3001\u524d\u7f00\u3001\u540e\u7f00<\/span>
\nString<\/span> result =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>joining<\/span>(<\/span>", "<\/span>,<\/span> "["<\/span>,<\/span> "]"<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5c06\u5b57\u7b26\u4e32\u6d41\u8fde\u63a5\u6210\u5355\u4e2a\u5b57\u7b26\u4e32<\/p>\n

\n

5. counting() – \u8ba1\u6570<\/h4>\n

Long<\/span> count =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>counting<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u7edf\u8ba1\u6d41\u4e2d\u5143\u7d20\u6570\u91cf
\n\u4e5f\u53ef\u7528：stream.count()（\u66f4\u7b80\u6d01）<\/p>\n

\n

6. summarizingInt\/Long\/Double() – \u7edf\u8ba1\u6458\u8981<\/h4>\n

IntSummaryStatistics<\/span> stats =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>summarizingInt<\/span>(<\/span>Integer<\/span>::<\/span>intValue<\/span>)<\/span>
\n)<\/span>;<\/span>
\n\/\/ \u83b7\u53d6: count, sum, min, max, average<\/span><\/p>\n

\u7528\u9014：\u83b7\u53d6\u6570\u503c\u6d41\u7684\u7edf\u8ba1\u6458\u8981\u4fe1\u606f<\/p>\n

\n

\u5206\u7ec4\u4e0e\u5206\u533a<\/h3>\n

7. groupingBy() – \u5206\u7ec4<\/h4>\n

\/\/ \u57fa\u7840\u5206\u7ec4<\/span>
\nMap<\/span><<\/span>String<\/span>,<\/span> List<\/span><<\/span>Employee<\/span>><\/span>><\/span><\/span> grouped =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>Employee<\/span>::<\/span>getDepartment<\/span>)<\/span>
\n)<\/span>;<\/span><\/p>\n

\/\/ \u5e26\u4e0b\u6e38\u6536\u96c6\u5668\u5206\u7ec4<\/span>
\nMap<\/span><<\/span>String<\/span>,<\/span> Set<\/span><<\/span>String<\/span>><\/span>><\/span><\/span> grouped =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>
\n Employee<\/span>::<\/span>getDepartment<\/span>,<\/span>
\n Collectors<\/span>.<\/span>mapping<\/span>(<\/span>Employee<\/span>::<\/span>getName<\/span>,<\/span> Collectors<\/span>.<\/span>toSet<\/span>(<\/span>)<\/span>)<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u6309\u5206\u7c7b\u51fd\u6570\u5bf9\u5143\u7d20\u5206\u7ec4<\/p>\n

\n

8. partitioningBy() – \u5206\u533a<\/h4>\n

Map<\/span><<\/span>Boolean<\/span>,<\/span> List<\/span><<\/span>Integer<\/span>><\/span>><\/span><\/span> partitioned =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>partitioningBy<\/span>(<\/span>n -><\/span> n %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>
\n)<\/span>;<\/span>
\n\/\/ \u7ed3\u679c: {false=[\u5947\u6570], true=[\u5076\u6570]}<\/span><\/p>\n

\u7528\u9014：\u6309\u8c13\u8bcd\u5c06\u5143\u7d20\u5206\u4e3a\u4e24\u7ec4（true\/false）<\/p>\n

\n

\u5f52\u7ea6\u64cd\u4f5c<\/h3>\n

9. reducing() – \u5f52\u7ea6<\/h4>\n

\/\/ \u57fa\u7840\u5f52\u7ea6<\/span>
\nOptional<\/span><<\/span>Integer<\/span>><\/span><\/span> sum =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>reducing<\/span>(<\/span>Integer<\/span>::<\/span>sum<\/span>)<\/span>
\n)<\/span>;<\/span><\/p>\n

\/\/ \u5e26\u521d\u59cb\u503c\u5f52\u7ea6<\/span>
\nInteger<\/span> sum =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>reducing<\/span>(<\/span>0<\/span>,<\/span> Integer<\/span>::<\/span>sum<\/span>)<\/span>
\n)<\/span>;<\/span><\/p>\n

\/\/ \u5e26\u6620\u5c04\u548c\u5f52\u7ea6<\/span>
\nOptional<\/span><<\/span>Integer<\/span>><\/span><\/span> sum =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>reducing<\/span>(<\/span>
\n Employee<\/span>::<\/span>getSalary<\/span>,<\/span>
\n Integer<\/span>::<\/span>sum<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u901a\u8fc7\u4e8c\u5143\u8fd0\u7b97\u5c06\u5143\u7d20\u5f52\u7ea6\u4e3a\u5355\u4e2a\u503c<\/p>\n

\n

10. summingInt\/Long\/Double() – \u6c42\u548c<\/h4>\n

Integer<\/span> sum =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>summingInt<\/span>(<\/span>Integer<\/span>::<\/span>intValue<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5bf9\u6570\u503c\u6d41\u6c42\u548c<\/p>\n

\n

11. averagingInt\/Long\/Double() – \u6c42\u5e73\u5747\u503c<\/h4>\n

Double<\/span> average =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>averagingInt<\/span>(<\/span>Integer<\/span>::<\/span>intValue<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u8ba1\u7b97\u6570\u503c\u6d41\u7684\u5e73\u5747\u503c<\/p>\n

\n

\u6781\u503c\u83b7\u53d6<\/h3>\n

12. maxBy() \/ minBy() – \u6700\u5927\/\u6700\u5c0f\u503c<\/h4>\n

Optional<\/span><<\/span>Integer<\/span>><\/span><\/span> max =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>maxBy<\/span>(<\/span>Integer<\/span>::<\/span>compareTo<\/span>)<\/span>)<\/span>;<\/span>
\nOptional<\/span><<\/span>Integer<\/span>><\/span><\/span> min =<\/span> stream.<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>minBy<\/span>(<\/span>Integer<\/span>::<\/span>compareTo<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u83b7\u53d6\u6d41\u4e2d\u7684\u6700\u5927\/\u6700\u5c0f\u5143\u7d20<\/p>\n

\n

13. collectingAndThen() – \u8f6c\u6362\u7ed3\u679c<\/h4>\n

List<\/span><<\/span>String<\/span>><\/span><\/span> unmodifiableList =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>collectingAndThen<\/span>(<\/span>
\n Collectors<\/span>.<\/span>toList<\/span>(<\/span>)<\/span>,<\/span>
\n Collections<\/span>::<\/span>unmodifiableList<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u6536\u96c6\u540e\u5bf9\u7ed3\u679c\u8fdb\u884c\u8f6c\u6362<\/p>\n

\n

\u9ad8\u7ea7\u6536\u96c6\u5668<\/h3>\n

14. mapping() – \u6620\u5c04\u6536\u96c6<\/h4>\n

Set<\/span><<\/span>String<\/span>><\/span><\/span> names =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>mapping<\/span>(<\/span>
\n Employee<\/span>::<\/span>getName<\/span>,<\/span>
\n Collectors<\/span>.<\/span>toSet<\/span>(<\/span>)<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5148\u6620\u5c04\u518d\u6536\u96c6<\/p>\n

\n

15. flatMapping() – \u6241\u5e73\u6620\u5c04\u6536\u96c6（Java 9+）<\/h4>\n

Set<\/span><<\/span>String<\/span>><\/span><\/span> allSkills =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>flatMapping<\/span>(<\/span>
\n emp -><\/span> emp.<\/span>getSkills<\/span>(<\/span>)<\/span>.<\/span>stream<\/span>(<\/span>)<\/span>,<\/span>
\n Collectors<\/span>.<\/span>toSet<\/span>(<\/span>)<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u6241\u5e73\u5316\u6620\u5c04\u540e\u6536\u96c6<\/p>\n

\n

16. filtering() – \u8fc7\u6ee4\u6536\u96c6（Java 9+）<\/h4>\n

List<\/span><<\/span>Employee<\/span>><\/span><\/span> senior =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>filtering<\/span>(<\/span>
\n emp -><\/span> emp.<\/span>getAge<\/span>(<\/span>)<\/span> ><\/span> 50<\/span>,<\/span>
\n Collectors<\/span>.<\/span>toList<\/span>(<\/span>)<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u8fc7\u6ee4\u540e\u518d\u6536\u96c6<\/p>\n

\n

\u81ea\u5b9a\u4e49\u6536\u96c6\u5668<\/h3>\n

17. of() – \u521b\u5efa\u81ea\u5b9a\u4e49\u6536\u96c6\u5668<\/h4>\n

Collector<\/span><<\/span>String<\/span>,<\/span> ?<\/span>,<\/span> String<\/span>><\/span><\/span> customCollector =<\/span> Collector<\/span>.<\/span>of<\/span>(<\/span>
\n StringBuilder<\/span>::<\/span>new<\/span>,<\/span> \/\/ supplier: \u521b\u5efa\u53ef\u53d8\u5bb9\u5668<\/span>
\n StringBuilder<\/span>::<\/span>append<\/span>,<\/span> \/\/ accumulator: \u7d2f\u52a0\u5143\u7d20<\/span>
\n StringBuilder<\/span>::<\/span>append<\/span>,<\/span> \/\/ combiner: \u5408\u5e76\u5bb9\u5668<\/span>
\n StringBuilder<\/span>::<\/span>toString<\/span> \/\/ finisher: \u8f6c\u6362\u7ed3\u679c<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u521b\u5efa\u5b8c\u5168\u81ea\u5b9a\u4e49\u7684\u6536\u96c6\u5668<\/p>\n

\n

\u6536\u96c6\u5668\u7ec4\u5408<\/h3>\n

18. \u591a\u91cd\u6536\u96c6\u5668<\/h4>\n

\/\/ \u540c\u65f6\u8fdb\u884c\u591a\u79cd\u6536\u96c6<\/span>
\nMap<\/span><<\/span>String<\/span>,<\/span> Object<\/span>><\/span><\/span> result =<\/span> stream.<\/span>collect<\/span>(<\/span>
\n Collectors<\/span>.<\/span>teeing<\/span>(<\/span>
\n Collectors<\/span>.<\/span>counting<\/span>(<\/span>)<\/span>,<\/span>
\n Collectors<\/span>.<\/span>summingDouble<\/span>(<\/span>Double<\/span>::<\/span>doubleValue<\/span>)<\/span>,<\/span>
\n (<\/span>count,<\/span> sum)<\/span> -><\/span> Map<\/span>.<\/span>of<\/span>(<\/span>"count"<\/span>,<\/span> count,<\/span> "sum"<\/span>,<\/span> sum)<\/span>
\n )<\/span>
\n)<\/span>;<\/span><\/p>\n

\u7528\u9014：\u5728\u4e00\u4e2a\u64cd\u4f5c\u4e2d\u6267\u884c\u591a\u4e2a\u6536\u96c6\u5668（Java 12+）<\/p>\n

\n

\u5b9e\u7528\u793a\u4f8b<\/h3>\n

\u793a\u4f8b 1：\u5458\u5de5\u6570\u636e\u5904\u7406<\/h4>\n

\/\/ \u6309\u90e8\u95e8\u5206\u7ec4，\u6536\u96c6\u5458\u5de5\u59d3\u540d<\/span>
\nMap<\/span><<\/span>String<\/span>,<\/span> List<\/span><<\/span>String<\/span>><\/span>><\/span><\/span> departmentEmployees =<\/span> employees.<\/span>stream<\/span>(<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>
\n Employee<\/span>::<\/span>getDepartment<\/span>,<\/span>
\n Collectors<\/span>.<\/span>mapping<\/span>(<\/span>Employee<\/span>::<\/span>getName<\/span>,<\/span> Collectors<\/span>.<\/span>toList<\/span>(<\/span>)<\/span>)<\/span>
\n )<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u6309\u90e8\u95e8\u7edf\u8ba1\u85aa\u8d44<\/span>
\nMap<\/span><<\/span>String<\/span>,<\/span> Double<\/span>><\/span><\/span> departmentSalary =<\/span> employees.<\/span>stream<\/span>(<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>
\n Employee<\/span>::<\/span>getDepartment<\/span>,<\/span>
\n Collectors<\/span>.<\/span>summingDouble<\/span>(<\/span>Employee<\/span>::<\/span>getSalary<\/span>)<\/span>
\n )<\/span>)<\/span>;<\/span><\/p>\n

\u793a\u4f8b 2：\u6570\u636e\u8f6c\u6362<\/h4>\n

\/\/ \u5c06\u5217\u8868\u8f6c\u6362\u4e3a\u4e0d\u53ef\u53d8 Map<\/span>
\nMap<\/span><<\/span>Integer<\/span>,<\/span> Employee<\/span>><\/span><\/span> employeeMap =<\/span> employees.<\/span>stream<\/span>(<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toUnmodifiableMap<\/span>(<\/span>
\n Employee<\/span>::<\/span>getId<\/span>,<\/span>
\n Function<\/span>.<\/span>identity<\/span>(<\/span>)<\/span>
\n )<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u5b57\u7b26\u4e32\u62fc\u63a5<\/span>
\nString<\/span> employeeNames =<\/span> employees.<\/span>stream<\/span>(<\/span>)<\/span>
\n .<\/span>map<\/span>(<\/span>Employee<\/span>::<\/span>getName<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>joining<\/span>(<\/span>", "<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\n

\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/tr>\n\n\n\n\n\n
toList() \u8fd4\u56de\u53ef\u53d8\u5217\u8868<\/td>\n\u4f7f\u7528 toUnmodifiableList() \u83b7\u53d6\u4e0d\u53ef\u53d8\u5217\u8868<\/td>\n<\/tr>\n
toMap() key \u51b2\u7a81<\/td>\n\u63d0\u4f9b\u5408\u5e76\u51fd\u6570\u4f5c\u4e3a\u7b2c\u4e09\u4e2a\u53c2\u6570<\/td>\n<\/tr>\n
\u5e76\u53d1\u4fee\u6539\u5f02\u5e38<\/td>\n\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u6536\u96c6\u5668\u6216\u5e76\u884c\u6d41\u65f6\u6ce8\u610f<\/td>\n<\/tr>\n
\u7a7a\u5143\u7d20\u5904\u7406<\/td>\n\u5728\u6536\u96c6\u524d\u8fc7\u6ee4\u6216\u5904\u7406\u7a7a\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u7248\u672c\u517c\u5bb9\u6027<\/h3>\n\n\u6536\u96c6\u5668\u6700\u4f4e\u7248\u672c<\/tr>\n\n\n\n\n\n
\u57fa\u7840\u6536\u96c6\u5668<\/td>\nJava 8<\/td>\n<\/tr>\n
flatMapping, filtering<\/td>\nJava 9<\/td>\n<\/tr>\n
teeing<\/td>\nJava 12<\/td>\n<\/tr>\n
toUnmodifiableList\/Set\/Map<\/td>\nJava 10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u603b\u7ed3<\/h3>\n

Collectors \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u6570\u636e\u6536\u96c6\u80fd\u529b：<\/p>\n

    \n
  • \u57fa\u7840\u6536\u96c6：toList, toSet, toMap, joining<\/li>\n
  • \u805a\u5408\u64cd\u4f5c：counting, summing, averaging, reducing<\/li>\n
  • \u5206\u7ec4\u5206\u533a：groupingBy, partitioningBy<\/li>\n
  • \u9ad8\u7ea7\u529f\u80fd：collectingAndThen, teeing, \u81ea\u5b9a\u4e49\u6536\u96c6\u5668<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357
    \nCollectors \u662f Java Stream API \u4e2d\u6700\u5f3a\u5927\u7684\u5de5\u5177\u4e4b\u4e00，\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6536\u96c6\u5668\u5b9e\u73b0，\u7528\u4e8e\u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u805a\u5408\u4e3a\u5404\u79cd\u7ed3\u679c\u3002\u5e38\u7528\u6536\u96c6\u5668
    \n1. toList() – \u6536\u96c6\u4e3a\u5217\u8868
    \nList list stream.collect(Collectors.toList());\u7528\u9014：\u5c06\u6d41\u5143\u7d20\u6536\u96c6\u5230 List \u4e2d
    \n\u8fd4\u56de：ArrayList&#xf<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,81,149],"topic":[],"class_list":["post-92017","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-python","tag-windows"],"yoast_head":"\nJava Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/92017.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357 Collectors \u662f Java Stream API \u4e2d\u6700\u5f3a\u5927\u7684\u5de5\u5177\u4e4b\u4e00，\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6536\u96c6\u5668\u5b9e\u73b0，\u7528\u4e8e\u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u805a\u5408\u4e3a\u5404\u79cd\u7ed3\u679c\u3002\u5e38\u7528\u6536\u96c6\u5668 1. toList() - \u6536\u96c6\u4e3a\u5217\u8868 List list stream.collect(Collectors.toList());\u7528\u9014：\u5c06\u6d41\u5143\u7d20\u6536\u96c6\u5230 List \u4e2d \u8fd4\u56de：ArrayList&#xf\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/92017.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-08T16:40:56+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/92017.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/92017.html\",\"name\":\"Java Stream Collectors \u529f\u80fd\u5168\u9762\u6307\u5357 - 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