List<Integer> list = Arrays.asList(111,222,333);\nStream<Integer> stream = list.stream();<\/code><\/pre>\n\u4e00\u79cd\u662f\u7531\u6570\u7ec4\u521b\u5efa\u6d41\uff1a<\/p>\n
IntStream stream = Arrays.stream(new int(){111,222,333});<\/code><\/pre>\n\u4e00\u79cd\u662f\u7531\u9759\u6001\u65b9\u6cd5Stream.of()\u521b\u5efa\u6d41\uff0c\u5e95\u5c42\u8fd8\u662fArrays.stream()\uff1a<\/p>\n
Stream<Integer> stream = Stream.of(111, 222, 333);<\/code><\/pre>\nStream stream = Stream.of(111, 222, 333);<\/p>\n
\u4ece\u6709\u5e8f\u96c6\u5408\u751f\u6210\u6d41\u65f6\u4f1a\u4fdd\u7559\u539f\u6709\u7684\u987a\u5e8f\u3002\u7531\u5217\u8868\u751f\u6210\u7684\u6d41\uff0c\u5176\u5143\u7d20\u987a\u5e8f\u4e0e\u5217\u8868\u4e00\u81f4\u3002
\u8fd8\u6709\u4e24\u79cd\u7279\u6b8a\u7684\u6d41\uff1a<\/p>\n
\n- \u7a7a\u6d41\uff1aStream.empty()<\/li>\n
- \u65e0\u9650\u6d41\uff1aStream.genarate()<\/li>\n<\/ul>\n
2.3 \u5143\u7d20\u5e8f\u5217<\/h3>\n
\u6d41\u4e5f\u53ef\u4ee5\u548c\u96c6\u5408\u4e00\u6837\u8bbf\u95ee\u5305\u542b\u7279\u5b9a\u7684\u5143\u7d20\u7c7b\u578b\u7684\u4e00\u7ec4\u6709\u5e8f\u503c\uff0c\u4f46\u662f\u5b83\u4eec\u7684\u4e3b\u8981\u76ee\u7684\u4e0d\u4e00\u6837\uff0c\u96c6\u5408\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5728\u4e8e\u5b58\u50a8\u548c\u8bbf\u95ee\u5143\u7d20\uff0c\u6d41\u7684\u4e3b\u8981\u76ee\u7684\u5728\u4e8e\u8868\u8fbe\u8ba1\u7b97\u3002<\/p>\n
3 \u6d41\u7684\u601d\u60f3<\/h2>\n
\u6d41\u5f0f\u601d\u60f3\u548c\u751f\u4ea7\u4e2d\u7684\u6d41\u6c34\u7ebf\u5177\u6709\u5f02\u66f2\u540c\u5de5\u4e4b\u5999\uff0c\u5f88\u591a\u6d41\u6a21\u578b\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6d41\uff0c\u8fd9\u4e9b\u6a21\u578b\u90fd\u53ea\u8d1f\u8d23\u5b83\u6240\u9700\u8981\u505a\u7684\u4e8b\u60c5\uff0c\u5e76\u4e0d\u9700\u8981\u683c\u5916\u7684\u5185\u5b58\u7a7a\u95f4\u6765\u5b58\u50a8\u5904\u7406\u7684\u7ed3\u679c\u3002\u8fd9\u4e9b\u6d41\u6a21\u578b\u53ef\u4ee5\u88ab\u94fe\u63a5\u8d77\u6765\u5f62\u6210\u4e00\u4e2a\u5927\u7684\u6d41\u6c34\u7ebf\uff0c\u6211\u4eec\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u4e0d\u5173\u6ce8\u4e2d\u95f4\u6b65\u9aa4\u7684\u6570\u636e\u88ab\u5982\u4f55\u5904\u7406\uff0c\u53ea\u9700\u8981\u4f7f\u7528\u6574\u4e2a\u6d41\u6c34\u7ebf\u5904\u7406\u540e\u7684\u7ed3\u679c\u3002\u63a5\u4e0b\u6765\u7684\u4ee3\u7801\u53ef\u4ee5\u4f53\u73b0\u8fd9\u79cd\u601d\u60f3\uff0c\u4ee3\u7801\u4e2d\u4ee5\u5546\u54c1\u4e3a\u4f8b\uff0c\u6211\u4eec\u8981\u7b5b\u9009\u51fa\u5546\u54c1\u4e2d\u4f53\u79ef\u5927\u4e8e200\u7684\u524d\u4e24\u4e2a\u5546\u54c1\u7684\u540d\u5b57\u3002<\/p>\n
\u9996\u5148\u662f\u5546\u54c1\u7c7b\u7684\u5b9a\u4e49\uff1a<\/p>\n
public class Goods {\n private final String Name;\n private final Integer Volume;\n\n public Goods(String name, Integer volume) {\n Name = name;\n Volume = volume;\n }\n public String getName() {\n return Name;\n }\n public Integer getVolume() {\n return Volume;\n }\n}<\/code><\/pre>\n\u63a5\u4e0b\u6765\u662f\u5546\u54c1\u96c6\u5408\u7684\u5b9a\u4e49\uff1a<\/p>\n
List<Goods> goods = Arrays.asList(new Goods("\u571f\u8c46",10),\nnew Goods("\u51b0\u7bb1",900),new Goods("\u529e\u516c\u6905",300));<\/code><\/pre>\n\u63a5\u4e0b\u6765\u83b7\u53d6\u6211\u4eec\u60f3\u8981\u7684\u7ed3\u679c\uff1a<\/p>\n
List<String> twofoods = goods.stream()\/\/\u83b7\u53d6\u6d41\n .filter(goods1 -> goods1.getVolume()>200)\/\/\u7b5b\u9009\u5546\u54c1\u4f53\u79ef\u5927\u4e8e200\u7684\n .map(Goods::getName)\/\/\u83b7\u53d6\u5546\u54c1\u540d\u79f0\n .limit(2)\/\/\u7b5b\u9009\u5934\u4e24\u4e2a\u5546\u54c1\n .collect(Collectors.toList());\/\/\u5c06\u7ed3\u679c\u4fdd\u5b58\u5728list\u4e2d<\/code><\/pre>\n\u8fd9\u6837\u770b\u6765\uff0c\u901a\u8fc7\u6d41\u6765\u5904\u7406\u6211\u4eec\u7684\u7279\u5b9a\u9700\u6c42\uff0c\u662f\u4e0d\u662f\u6bd4\u4f7f\u7528\u96c6\u5408\u7684\u8fed\u4ee3\u8981\u65b9\u4fbf\u5f88\u591a\u5462\uff1f<\/p>\n
4 \u6d41\u5904\u7406\u7684\u7279\u6027<\/h2>\n\n- \u4e0d\u5b58\u50a8\u6570\u636e<\/li>\n
- \u4e0d\u4f1a\u6539\u53d8\u6570\u636e\u6e90<\/li>\n
- \u53ea\u53ef\u88ab\u4f7f\u7528\u4e00\u6b21<\/li>\n<\/ul>\n
\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u6d4b\u8bd5\u7c7bStreamCharacteristic\u6765\u9a8c\u8bc1\u6d41\u5904\u7406\u7684\u4ee5\u4e0a\u7279\u6027\uff1a<\/p>\n
import org.springframework.util.Assert;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.stream.Collectors;\nimport java.util.stream.Stream;\npublic class StreamCharacteristic {\n public void test1(){\n List<Integer> list = Arrays.asList(1,2,2,5,6,9);\n list.stream().distinct();\n System.out.println(list.size());\n }\n public void test2(){\n List<String> list = Arrays.asList("wms", "KA", "5.0");\n Stream<String> stream = list.stream();\n stream.forEach(System.out::println);\n stream.forEach(System.out::println);\n }\n}<\/code><\/pre>\ntest1()\u4e2d\u7684\u7ed3\u679c\u4e3a6\uff0c\u5c3d\u7ba1\u6211\u4eec\u5bf9\u4e8elist\u5bf9\u8c61\u6240\u751f\u6210\u7684Stream\u6d41\u505a\u4e86\u53bb\u91cd\u64cd\u4f5cdistinct()\uff0c\u4f46\u662f\u4e0d\u5f71\u54cd\u6570\u636e\u6e90list\u3002<\/p>\n
test2()\u4e2d\u8c03\u7528\u4e86\u4e24\u6b21 stream.forEach\u65b9\u6cd5\u6765\u6253\u5370\u6bcf\u4e00\u4e2a\u5355\u8bcd\uff0c\u7b2c\u4e8c\u6b21\u8c03\u7528\u65f6\uff0c\u629b\u51fa\u4e86\u4e00\u4e2a\u201cjava.lang.IllegalStateException\u201d\u5f02\u5e38\uff1a\u201cstream has already been operated upon or closed\u201d\u3002\u8fd9\u8bf4\u660e\u6d41\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u904d\u5386\u5b8c\u540e\u8fd9\u4e2a\u6d41\u5df2\u7ecf\u88ab\u6d88\u8d39\u6389\u4e86\uff0c\u800c\u4e14\u6d41\u4e0d\u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u3002<\/p>\n
5 \u6d41\u64cd\u4f5c\u4e0e\u6d41\u7684\u4f7f\u7528<\/h2>\n
\u5c06\u6240\u6709\u7684\u6d41\u64cd\u4f5c\u8fde\u63a5\u8d77\u6765\u53ef\u4ee5\u7ec4\u5408\u6210\u4e00\u4e2a\u7ba1\u9053\uff0c\u7ba1\u9053\u6709\u4e24\u7c7b\u64cd\u4f5c\uff1a\u4e2d\u95f4\u64cd\u4f5c\u548c\u7ec8\u7aef\u64cd\u4f5c\u3002
StreamAPI\u5e38\u7528\u7684\u4e2d\u95f4\u64cd\u4f5c\u6709\uff1afilter,map,limit,sorted,distinct\u3002<\/p>\n
StreamAPI\u5e38\u7528\u7684\u7ec8\u7aef\u64cd\u4f5c\u6709\uff1aforEach,count,collect\u3002<\/p>\n
\u5728\u4f7f\u7528\u6d41\u7684\u65f6\u5019\uff0c\u4e3b\u8981\u9700\u8981\u4e09\u4e2a\u8981\u7d20\uff1a\u4e00\u4e2a\u7528\u6765\u6267\u884c\u67e5\u8be2\u7684\u6570\u636e\u6e90\uff0c\u7528\u6765\u5f62\u6210\u4e00\u6761\u6d41\u7684\u6d41\u6c34\u7ebf\u7684\u4e2d\u95f4\u64cd\u4f5c\u94fe\uff0c\u4e00\u4e2a\u80fd\u591f\u6267\u884c\u6d41\u6c34\u7ebf\u5e76\u80fd\u751f\u6210\u7ed3\u679c\u7684\u7ec8\u7aef\u64cd\u4f5c\u3002<\/p>\n
\u4e0b\u56fe\u5c55\u793a\u4e86\u6d41\u7684\u6574\u4e2a\u64cd\u4f5c\u6d41\u7a0b\uff1a<\/p>\n
![\"\"](\"https:\/\/segmentfault.com\/img\/remote\/1460000043990840\" "\\"\\"")
[]()<\/p>\n
6 \u603b\u7ed3<\/h2>\n\n- \u6d41\u662f\u4ece\u652f\u6301\u6570\u636e\u5904\u7406\u64cd\u4f5c\u7684\u6e90\u751f\u6210\u7684\u5143\u7d20\u5e8f\u5217<\/li>\n
- \u6d41\u7684\u601d\u60f3\u7c7b\u4f3c\u4e8e\u751f\u4ea7\u4e2d\u7684\u6d41\u6c34\u7ebf<\/li>\n
- \u6d41\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u4e0d\u6539\u53d8\u6570\u636e\u6e90\uff0c\u53ea\u80fd\u88ab\u6539\u53d8\u4e00\u6b21<\/li>\n
- \u6d41\u7684\u64cd\u4f5c\u4e3b\u8981\u5206\u4e3a\u4e2d\u95f4\u64cd\u4f5c\u548c\u7ec8\u7aef\u64cd\u4f5c\u4e24\u5927\u7c7b<\/li>\n<\/ul>\n
\n\u4f5c\u8005\uff1a\u4eac\u4e1c\u7269\u6d41 \u738b\u8fb0\u73ae<\/p>\n
\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u81ea\u733f\u5176\u8bf4Tech<\/p>\n<\/blockquote>\n