{"id":881,"date":"2021-02-17T21:16:16","date_gmt":"2021-02-17T13:16:16","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=881"},"modified":"2021-02-18T11:57:40","modified_gmt":"2021-02-18T03:57:40","slug":"lambda-%e8%a1%a8%e8%be%be%e5%bc%8f-2","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-881.html","title":{"rendered":"lambda \u8868\u8fbe\u5f0f"},"content":{"rendered":"\n

lambda \u8868\u8fbe\u5f0f\u662f Java 8 \u7684\u65b0\u7279\u6027\uff0c<\/p>\n\n\n\n

\u6b64\u8868\u8fbe\u5f0f\u4f5c\u7528\u4e0a\uff0c\u4ec5\u7528\u4e8e\u51fd\u6570\u5f0f\u63a5\u53e3\u505a\u53c2\u6570\u6216\u8fd4\u56de\u503c\u65f6\uff0c\u5feb\u901f\u751f\u6210\u5b9e\u73b0\u7c7b\u5bf9\u8c61<\/p>\n\n\n\n

\u5728\u672c\u8d28\u4e0a, \u533f\u540d\u5185\u90e8\u7c7b\u4f1a\u5728 bin\u4e0b\u751f\u6210class\u4ee3\u7801\uff0c\u800clambda \u521b\u5efa\u7684\u5219\u4e0d\u4f1a<\/p>\n\n\n\n

1.\u8bed\u6cd5\u683c\u5f0f<\/h5>\n\n\n\n
(\u53c2\u6570\u5217\u8868) -> {\u4e00\u4e9b\u8bed\u53e5}<\/code><\/pre>\n\n\n\n
\u5bf9\u4e8e (\u53c2\u6570\u5217\u8868)\uff0c\u53ef\u4ee5\u7701\u7565\u6570\u636e\u7c7b\u578b\uff0c\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\u65f6\uff0c\u8fd8\u53ef\u7701\u7565 ()<\/p>\n\n\n\n
\u5bf9\u4e8e {\u4e00\u4e9b\u8bed\u53e5}\uff0c\u5982\u679c\u4ec5\u6709\u4e00\u4e2a\u8bed\u53e5\uff0c\u53ef\u7701\u7565 {}, return, ; (\u5fc5\u987b\u4e00\u8d77\u7701\u7565)<\/p>\n\n\n\n
2.\u4f8b\u5b50<\/h5>\n\n\n\n
1.\u521b\u5efa Demo.java \u6d4b\u8bd5\u7c7b\u6587\u4ef6\uff0c\u5148\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3<\/p>\n\n\n\n
2.\u521b\u5efa\u53e6\u4e00\u4e2a\u7c7b\uff0c\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\uff0c\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u505a\u53c2\u6570<\/p>\n\n\n\n
3.\u521b\u5efa\u4e00\u4e2a main \u51fd\u6570 \uff0c\u5f00\u59cb\u6d4b\u8bd5 lambda \u8868\u8fbe\u5f0f<\/p>\n\n\n\n
public class Demo {\n\tpublic static void main(String[] args) {\n\t\tMy my1 = new My(new MyInterface() {\n\t\t\t@Override\n\t\t\tpublic void show() {\n\t\t\t\tSystem.out.println(\"\u4f7f\u7528\u533f\u540d\u5185\u90e8\u7c7b\u65b9\u5f0f\u4f20\u9012\u53c2\u6570\");\n\t\t\t}\n\t\t});\n\t\tMy my2 = new My(()->System.out.println(\"\u4f7f\u7528lambda\u65b9\u5f0f\u4f20\u9012\u53c2\u6570\"));\n\t}\n}\n@FunctionalInterface\ninterface MyInterface {\n\t\n\tpublic abstract void show();\n\t\n}\n\/\/\u521b\u5efa\u4e00\u4e2a\u8c03\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u505a\u53c2\u6570\u7684\u7c7b\nclass My {\n\t\n\t\/\/\u6784\u9020\u65b9\u6cd5\u4e2d\u7684\u53c2\u6570\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\n\tpublic My(MyInterface my) {\n\t\tmy.show();\n\t}\n}<\/code><\/pre>\n\n\n\n
3.lambda\u8868\u8fbe\u5f0f\u7684\u5ef6\u8fdf\u52a0\u8f7d<\/h5>\n\n\n\n
\u8868\u8fbe\u5f0f\u867d\u7136\u4f1a\u751f\u6210\u5bf9\u8c61\uff0c\u4f46\u5f53\u4e14\u4ec5\u5f53\u5bf9\u8c61\u4f7f\u7528\u65f6\uff0c\u624d\u8c03\u7528\u8868\u8fbe\u5f0f\u751f\u6210\u8be5\u5bf9\u8c61<\/p>\n\n\n\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u5bf9\u8c61\u4e00\u76f4\u6ca1\u88ab\u4f7f\u7528\uff0c\u5c31\u4e0d\u4f1a\u88ab\u521b\u5efa\uff0c\u8fd9\u6837\u66f4\u8282\u7701\u6027\u80fd<\/p>\n\n\n\n
\u4e0b\u9762\u521b\u5efa\u4e00\u4e2a Demo2.java\u6587\u4ef6\uff0c\u548c\u4ee3\u7801\u4e2d\u52a0\u4e0a\u4e86\u4e00\u4e9b\u63d0\u793a\u8f93\u51fa\u8bed\u53e5\uff0c<\/p>\n\n\n\n
public class Demo2 {\n\tpublic static void main(String[] args) {\n\t\tMy2 my = new My2(2, new MyInterface2() {\n\t\t\t{\n\t\t\t\tSystem.out.println(\"\u533f\u540d\u5185\u90e8\u7c7b\u88ab\u521b\u5efa\u4e86\");\n\t\t\t}\n\t\t\t@Override\n\t\t\tpublic void showLog() {\n\t\t\t\tSystem.out.println();\n\t\t\t}\n\n\t\t});\n\t\tMy2 my2 = new My2(2,()->System.out.println(\"lambda\u8868\u8fbe\u5f0f\u88ab\u6267\u884c\u5566\"));\n\t}\n\n}\n@FunctionalInterface\ninterface MyInterface2 {\n\t\n\tpublic abstract void showLog();\n\n}\n\/\/\u521b\u5efa\u4e00\u4e2a\u8c03\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u505a\u53c2\u6570\u7684\u7c7b\nclass My2 {\n\t\n\t\/\/\u6784\u9020\u65b9\u6cd5\u4e2d\u7684\u53c2\u6570\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\n\tpublic My2(int level,MyInterface2 my) {\n\t\tif(level==1) {\n\t\t\tmy.showLog();\n\t\t}\n\t}\n}<\/code><\/pre>\n\n\n\n
\u8fd0\u884c\u4e0a\u9762\u7684\u7a0b\u5e8f\uff0c\u53d1\u73b0\u533f\u540d\u5185\u90e8\u7c7b\u88ab\u521b\u5efa\u4e86\uff0c\u800c lambda \u8868\u8fbe\u5f0f\u6ca1\u6709\u88ab\u8c03\u7528<\/p>\n\n\n\n
( \u4e25\u683c\u6765\u8bf4\uff0c\u5ef6\u8fdf\u52a0\u8f7d\u5c31\u662f\u88ab\u8c03\u7528\u65f6\u521b\u5efa\uff0c\u90a3\u4e48\u4e00\u65e6\u8c03\u7528\u5219\u4f1a\u521b\u5efa\uff09<\/p>\n\n\n\n
( \u4ee5\u8fd9\u79cd\u4e25\u683c\u8bf4\u6cd5\uff0c\u5b9e\u9645\u4e0a lambda \u8868\u8fbe\u5f0f\u7684\u5ef6\u8fdf\u52a0\u8f7d\u6839\u672c\u4e0d\u80fd\u88ab\u4ee3\u7801\u8bc1\u660e)<\/p>\n","protected":false},"excerpt":{"rendered":"
lambda \u8868\u8fbe\u5f0f\u662f Java 8 \u7684\u65b0\u7279\u6027\uff0c \u6b64\u8868\u8fbe\u5f0f\u4f5c\u7528\u4e0a\uff0c\u4ec5\u7528\u4e8e\u51fd\u6570\u5f0f\u63a5\u53e3\u505a\u53c2\u6570\u6216\u8fd4\u56de\u503c\u65f6\uff0c\u5feb\u901f\u751f\u6210\u5b9e… \u7ee7\u7eed\u9605\u8bfb lambda \u8868\u8fbe\u5f0f<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[28],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/881"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=881"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/881\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}