{"id":12771,"date":"2023-09-21T14:18:10","date_gmt":"2023-09-21T06:18:10","guid":{"rendered":"https:\/\/92it.top\/?p=12771"},"modified":"2023-09-21T14:18:10","modified_gmt":"2023-09-21T06:18:10","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3java-util-function","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=12771","title":{"rendered":"Java\u2014\u2014\u51fd\u6570\u5f0f\u63a5\u53e3(java.util.function)"},"content":{"rendered":"\n<p><strong>\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4ec0\u4e48<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5b9a\u4e49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u6709\u4e14\u4ec5\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff08\u4e0d\u5305\u62ec\u9ed8\u8ba4\u65b9\u6cd5\u3001\u9759\u6001\u65b9\u6cd5\u4ee5\u53ca\u5bf9Object\u65b9\u6cd5\u7684\u91cd\u5199\uff09<\/pre>\n\n\n\n<p>\u5927\u5bb6\u5bf9\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u8ba4\u8bc6\u5e94\u8be5\u90fd\u6765\u81ea\u4e8eJava8\u7684Stream API\uff0c\u6bd4\u5982Predicate\u3001Function\uff0c\u501f\u52a9\u8fd9\u4e9b\u51fd\u6570\u5f0f\u63a5\u53e3\uff0cStream\u624d\u80fd\u5199\u51fa\u4e00\u4e2a\u4e2a\u9a9a\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<p>\u5bf9\u4e8eStream\u6d41\u5927\u5bb6\u5e38\u7528\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b\uff1f<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-1024x353.png\" alt=\"\" class=\"wp-image-12773\" width=\"476\" height=\"163\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-1024x353.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-300x103.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-768x264.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-830x286.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-230x79.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-350x121.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32-480x165.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-32.png 1150w\" sizes=\"(max-width: 476px) 100vw, 476px\" \/><\/figure><\/div>\n\n\n\n<p>\u770b\u7740\u8fd9\u4e9b\u5e38\u7528\u65b9\u6cd5\uff0c\u5165\u53c2\u90fd\u662fFunction\u76f8\u5173\u63a5\u53e3\u51fd\u6570<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StreamTest {\n\n    public static void main(String[] args) {\n\n        List&lt;User> userList = Lists.newArrayList();\n        userList.add(new User(1L, \"\u5f7c\u5f97\", 18));\n        userList.add(new User(2L, \"\u9c8d\u52c3\", 19));\n        userList.add(new User(3L, \"\u5a01\u5ec9\n\n        userList.stream()\n                .filter(user -> user.getAge() > 18)\n                .map(User::getName)\n                .forEach(System.out::println);\n    }\n}<\/pre>\n\n\n\n<p>\u70b9\u8fdb<a rel=\"noreferrer noopener\" href=\"https:\/\/www.zhihu.com\/search?q=filter%E6%96%B9%E6%B3%95&amp;search_source=Entity&amp;hybrid_search_source=Entity&amp;hybrid_search_extra=%7B%22sourceType%22%3A%22answer%22%2C%22sourceId%22%3A1744506336%7D\" target=\"_blank\">filter\u65b9\u6cd5<\/a>\uff0c\u4f60\u4f1a\u53d1\u73b0\u5b83\u7684\u53c2\u6570\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3Predicate\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-1024x170.png\" alt=\"\" class=\"wp-image-12772\" width=\"563\" height=\"93\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-1024x170.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-300x50.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-768x127.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-830x138.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-230x38.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-350x58.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31-480x80.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-31.png 1388w\" sizes=\"(max-width: 563px) 100vw, 563px\" \/><\/figure><\/div>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u4ece\u4e2d\u5f97\u5230\u542f\u53d1\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0d\u540c\u4e8e\u4ee5\u5f80\u7684\u666e\u901a\u63a5\u53e3\uff0c\u5b83\u6700\u5927\u7684\u4f5c\u7528\u5176\u5b9e\u662f\u4e3a\u4e86\u652f\u6301\u884c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u6bd4\u5982\u4f20\u9012Lambda\u3001\u65b9\u6cd5\u5f15\u7528\u3001\u51fd\u6570\u5f0f\u63a5\u53e3\u5bf9\u5e94\u7684\u5b9e\u4f8b\u5bf9\u8c61\u7b49\u3002<\/pre>\n\n\n\n<p>\u603b\u7ed3\u4e00\u53e5\u8bdd\uff0cFunction\u51fd\u6570\u4f5c\u4e3a\u65b9\u6cd5\u5165\u53c2\uff0c\u6838\u5fc3\u539f\u56e0\u5c31\u662f\u628a<strong>\u5177\u4f53\u4e1a\u52a1\u903b\u8f91\u4ea4\u7531\u5916\u5c42\u5904\u7406<\/strong>\u3002\u4f7f\u65b9\u6cd5\u53ea\u5904\u7406\u6838\u5fc3\u903b\u8f91\uff0c\u4ece\u800c\u51cf\u5c11\u4e1a\u52a1\u903b\u8f91\u5bf9\u65b9\u6cd5\u7684\u4fb5\u5165\u6027\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u4f18\u96c5\uff0c\u6613\u4e8e\u7ef4\u62a4\u3002<br>\u4f8b\u5982<code>map(Function&lt;? super T, ? extends R> mapper)<\/code>\u65b9\u6cd5\uff0c\u5c31\u662f\u628a\u96c6\u5408\u4e2d\u5355\u4e2aitem\u5bf9\u8c61\u7684\u5904\u7406\u903b\u8f91\u4ea4\u7531\u5916\u90e8\u903b\u8f91\u5904\u7406\u3002 map\u65b9\u6cd5\u5185\u53ea\u9700\u83b7\u53d6\u7ed3\u679c\u8fdb\u884c\u6838\u5fc3\u903b\u8f91\u5904\u7406\u3002<\/p>\n\n\n\n<p><strong>\u56db\u5927\u57fa\u672c\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u662f java.util.function \u5305\u4e0b\u6700\u57fa\u672c\u7684\u56db\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\u3002<\/p>\n\n\n\n<ul><li><strong>Function<\/strong><\/li><\/ul>\n\n\n\n<p>Function&lt;T, R> \u662f Java 8 \u4e2d\u7684\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u7528\u4e8e\u8868\u793a\u63a5\u53d7\u4e00\u4e2a\u8f93\u5165\u53c2\u6570 T\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c R \u7684\u51fd\u6570\u3002Function\u63a5\u53e3\u4e2d\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5apply\uff0c\u7528\u4e8e\u5b9a\u4e49\u51fd\u6570\u7684\u903b\u8f91\u3002Function\u63a5\u53e3\u901a\u5e38\u7528\u4e8e\u5c06\u6570\u636e\u8fdb\u884c\u8f6c\u6362\u3001\u6620\u5c04\u6216\u8005\u6267\u884c\u67d0\u79cd\u8f6c\u6362\u64cd\u4f5c\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-1024x524.png\" alt=\"\" class=\"wp-image-12774\" width=\"436\" height=\"222\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-1024x524.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-300x154.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-768x393.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-830x425.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-230x118.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-350x179.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33-480x246.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-33.png 1110w\" sizes=\"(max-width: 436px) 100vw, 436px\" \/><\/figure><\/div>\n\n\n\n<p>Function \u63a5\u53e3\u7684 apply \u65b9\u6cd5\uff0c\u5c31\u662f\u8ba9\u4f60\u4f20\u5165\u4e00\u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u503c\u3002<\/p>\n\n\n\n<p>\u5e76\u4e14\u5728\u6cdb\u578b\u4e2d\u4f53\u73b0\u4e86 \u4f20\u5165 \u548c \u8fd4\u56de \u7684\u53c2\u6570\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u5b9e\u4f8b1\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.function.Function;\n\npublic class Function_Demo {\n    public static void main(String[] args) {\n        Function&lt;String,String> function = new Function&lt;String, String>() {\n            @Override\n            public String apply(String s) {\n                return s;\n            }\n        };\n        System.out.println(function.apply(\"Sky\"));\n\n        \/\/lambda \u8868\u8fbe\u5f0f\u5199\u6cd5\uff1a\n        function = ((str)->{ return str;});\n        System.out.println(function.apply(\"Song\"));\n    }\n}\n\n\u6253\u5370\u7ed3\u679c\uff1a\nSky\nSong<\/pre>\n\n\n\n<p>\u5b9e\u4f8b2:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public static void main(String[] args) {\n    List&lt;Plan> planList  = new ArrayList&lt;>(Collections.emptyList());\n    planList.add(new Plan(1L,\"SUCCEED\"));\n    planList.add(new Plan(2L,\"FAIL\"));\n\n    \/\/ map\u65b9\u6cd5\u5165\u53c2\uff0c\u9700\u8981\u4f20\u5165\u4e00\u4e2aFunction\u51fd\u6570\u3002item -> item.getPlanNo())\u5199\u6cd5\u5c5e\u4e8e\n    \/\/ Function\u51fd\u6570\u89c4\u8303\u3002item\u8868\u793a\u5165\u53c2\uff0citem.getPlanNo()\u8868\u793a\u8fd4\u53c2\n    Set&lt;Long> planNoList1 = planList.stream().map(item -> item.getPlanNo()).collect(Collectors.toSet());\n    \/\/ \u7b80\u5199\n    Set&lt;Long> planNoList2 = planList.stream().map(Plan::getPlanNo).collect(Collectors.toSet());\n}\n\nstatic class Plan{\n    private Long planNo;\n    private String planStatus;\n\n    public Plan(Long planNo, String planStatus){\n        this.planNo = planNo;\n        this.planStatus = planStatus;\n    }\n\n    public Long getPlanNo() {\n        return planNo;\n    }\n    public Plan setPlanNo(Long planNo) {\n        this.planNo = planNo;\n        return this;\n    }\n    public String getPlanStatus() {\n        return planStatus;\n    }\n    public Plan setPlanStatus(String planStatus) {\n        this.planStatus = planStatus;\n        return this;\n    }\n}<\/pre>\n\n\n\n<ul><li><strong>Predicate<\/strong><\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-1024x450.png\" alt=\"\" class=\"wp-image-12775\" width=\"491\" height=\"215\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-1024x450.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-300x132.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-768x337.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-830x365.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-230x101.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-350x154.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34-480x211.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-34.png 1530w\" sizes=\"(max-width: 491px) 100vw, 491px\" \/><\/figure><\/div>\n\n\n\n<p>Predicate \u63a5\u53e3\u7684 test \u65b9\u6cd5\u5c31\u662f\u4f20\u5165\u4e00\u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a boolean \u503c\u3002<\/p>\n\n\n\n<p>\u5b9e\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.function.Predicate;\n\npublic class Predicate_demo {\n    public static void main(String[] args) {\n        Predicate&lt;Integer> predicate =new Predicate&lt;Integer>() {\n            @Override\n            public boolean test(Integer integer) {\n                return 0 != integer;\n            }\n        };\n        System.out.println(predicate.test(0));\n\n        \/\/lambda \u8868\u8fbe\u5f0f\u5199\u6cd5\uff1a\n        predicate = (integer -> {return 0 != integer;});\n        System.out.println(predicate.test(1));\n    }\n}\n\n\u6253\u5370\u7ed3\u679c\uff1a\nfalse\ntrue<\/pre>\n\n\n\n<ul><li><strong>Consumer<\/strong><\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-1024x523.png\" alt=\"\" class=\"wp-image-12776\" width=\"473\" height=\"242\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-1024x523.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-300x153.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-768x393.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-830x424.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-230x118.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-350x179.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35-480x245.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-35.png 1166w\" sizes=\"(max-width: 473px) 100vw, 473px\" \/><\/figure><\/div>\n\n\n\n<p>Consumer \u63a5\u53e3\u7684 accept \u65b9\u6cd5\u5c31\u662f \u4f20\u5165\u4e00\u4e2a\u53c2\u6570\uff0c\u4f46\u662f\u4e0d\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<p>\u662f\u7684\uff0c\u4f20\u8fdb\u53bb\u7684\u503c\u88ab\u6d88\u8d39\u4e86\uff0c\u987e\u540d\u601d\u4e49\uff01\uff01<\/p>\n\n\n\n<p>\u5b9e\u4f8b1\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.function.Consumer;\n\npublic class Consumer_Demo {\n    public static void main(String[] args) {\n        Consumer&lt;String> consumer = new Consumer&lt;String>() {\n            @Override\n            public void accept(String s) {\n                System.out.println(\"\u6d88\u8d39\uff1a\"+s);\n            }\n        };\n        consumer.accept(\"cake\");\n\n        \/\/lambda \u8868\u8fbe\u5f0f\u5199\u6cd5\uff1a\n        consumer = (str)->{ System.out.println(\"\u6d88\u8d39\uff1a\"+str); };\n        consumer.accept(\"money\");\n    }\n\n}\n\u6253\u5370\u7ed3\u679c\uff1a\n\u6d88\u8d39\uff1acake\n\u6d88\u8d39\uff1amoney<\/pre>\n\n\n\n<p>\u5b9e\u4f8b2:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public static void main(String[] args) {\n    List&lt;Plan> planList  = new ArrayList&lt;>();\n    planList.add(new Plan(1L,\"SUCCEED\"));\n    planList.add(new Plan(2L,\"FAIL\"));\n    planList.add(new Plan(3L,\"SUCCEED\"));\n\n    List&lt;Long> planNo = new ArrayList&lt;>();\n    planList.stream()\n            .filter(plan -> \"SUCCEED\".equals(plan.getPlanStatus()))\n            \/\/ forEarch\u65b9\u6cd5\u5165\u53c2\uff0c\u9700\u8981\u4f20\u5165\u4e00\u4e2aConsumer\u51fd\u6570\u3002plan -> planNo.add(plan.getPlanNo())\u7b26\u5408\u51fd\u6570\u89c4\u8303\u3002 plan\u8868\u793a\u5165\u53c2\u3002\n            .forEach(plan -> planNo.add(plan.getPlanNo()));\n    System.out.println(\"count:\" + planNo.size());\n}<\/pre>\n\n\n\n<ul><li><strong>Supplier<\/strong><\/li><\/ul>\n\n\n\n<p>\u6709\u4e86 \u6d88\u8d39\u8005 \u81ea\u7136\u8981\u6709 \u751f\u4ea7\u8005\uff01<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36.png\" alt=\"\" class=\"wp-image-12777\" width=\"348\" height=\"288\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36.png 744w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36-300x248.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36-230x190.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36-350x290.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2023\/09\/\u56fe\u7247-36-480x397.png 480w\" sizes=\"(max-width: 348px) 100vw, 348px\" \/><\/figure><\/div>\n\n\n\n<p>Supplier \u63a5\u53e3\u7684 get \u65b9\u6cd5\u5c31\u662f\u4e0d\u7528\u5f80\u91cc\u4f20\u53c2\u6570\uff0c\u5c31\u80fd\u8fd4\u56de\u4e00\u4e2a\u503c\u3002<\/p>\n\n\n\n<p>\u5b9e\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.function.Supplier;\n\npublic class Supplier_Demo {\n    public static void main(String[] args) {\n        Supplier&lt;String> supplier = new Supplier&lt;String>() {\n            @Override\n            public String get() {\n                return \"\u63d0\u4f9b\uff1aSky\";\n            }\n        };\n        System.out.println(supplier.get());\n\n        \/\/lambda \u8868\u8fbe\u5f0f\u5199\u6cd5\uff1a\n        supplier = ()->{return \"\u63d0\u4f9b\uff1aSong\";};\n        System.out.println(supplier.get());\n    }\n}\n\u6253\u5370\u7ed3\u679c\uff1a\n\u63d0\u4f9b\uff1aSky\n\u63d0\u4f9b\uff1aSong<\/pre>\n\n\n\n<ul><li><strong>BiFunction\u51fd\u6570<\/strong><\/li><\/ul>\n\n\n\n<p>\u4e0eFunction\u533a\u522b\u5728\u4e8e\uff0cBiFunction\u5141\u8bb8\u4f20\u51652\u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u503c\u3002<\/p>\n\n\n\n<ul><li><strong>BiConsumer\u51fd\u6570<\/strong><\/li><\/ul>\n\n\n\n<p>\u4e0eConsumer\u51fd\u6570\u533a\u522b\u5728\u4e8e\uff0cBiConsumer\u51fd\u6570\u5141\u8bb8\u4f20\u51652\u4e2a\u53c2\u6570\uff0c\u65e0\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u9645\u573a\u666fFunction\u51fd\u6570\u5e94\u7528<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5f53\u6211\u4e86\u89e3Stream\u5bf9Function\u7684\u51fd\u6570\u8fd0\u7528\u540e\uff0c\u6211\u4f69\u670d\u8fd9\u4e9b\u6e90\u7801\u7f16\u5199\u5927\u4f6c\u7684\u601d\u8def\u4e0e\u624d\u534e\u3002\u6240\u4ee5\u6211\u8ba4\u4e3a\u6838\u5fc3\u662f\u9700\u8981\u5b66\u4e60\u4ed6\u4eec\u7684\u7f16\u7801\u8bbe\u8ba1\u601d\u8def\uff0c\u5728\u65e5\u5e38\u7f16\u5199\u4ee3\u7801\u4e2d\uff0c\u771f\u7684\u78b0\u5230\u4e86\u7c7b\u4f3c\u573a\u666f\uff0c\u5c31\u53ef\u4ee5\u60f3\u8d77\u5e76\u8fd0\u7528\u8fd9\u5957\u601d\u60f3\u53bb\u8bbe\u8ba1\u4ee3\u7801\uff0c\u4f7f\u5f97\u6211\u4eec\u4ee3\u7801\u66f4\u52a0\u4f18\u96c5\uff0c\u7b80\u6d01\u9ad8\u6548\u3002\u8fd9\u4e5f\u662f\u6211\u4eec\u5b66\u4e60\u6e90\u7801\u7684\u521d\u8877\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u6709\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff0c\u6211\u4eec\u5bf9\u63a5\u4e86\u5f88\u591a\u652f\u4ed8\u6e20\u9053\uff0c\u6bcf\u5bb6\u5bf9\u63a5\u53e3\u53c2\u6570\u7684\u52a0\u5bc6\u65b9\u5f0f\u4e0d\u540c\u3002\u6211\u4eec\u53ef\u4ee5\u9488\u5bf9\u652f\u4ed8\u6e20\u9053\u8bbe\u8ba1\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002\u5728\u62bd\u8c61\u7c7b\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7b7e\u540d\u65b9\u6cd5\u3002\u5177\u4f53\u4e0d\u540c\u6e20\u9053\u7684\u7b7e\u540d\u89c4\u5219\u4ee5Function\u51fd\u6570\u4f20\u5165\u3002<\/p>\n\n\n\n<p>\u62bd\u8c61\u7c7b\u4e2d\u516c\u5171\u7b7e\u540d\u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * \u6392\u5e8f\u5e76\u7b7e\u540d\n *\n * @param params   \u8981\u7b7e\u540d\u53c2\u6570\n * @param append   \u5f85\u7b7e\u540d\u5b57\u7b26\u4e32\u8ffd\u52a0\u5185\u5bb9\n * @param signName \u7b7e\u540d\u53c2\u6570\n * @param signer   \u7b7e\u540d\u51fd\u6570\n * @return \u6700\u7ec8\u7b7e\u540d\n *\/\nprotected final String sign(Map&lt;String, String> params,\n                            String append,\n                            String signName,\n                            Function&lt;String, String> signer) {\n    String signStr = params.keySet().stream()\n            .filter(key -> StringUtils.hasLength(key)\n                    &amp;&amp; !key.equals(signName)\n                    &amp;&amp; StringUtils.hasLength(params.get(key)))\n            .sorted()\n            .map(key -> key + \"=\" + params.get(key))\n            .collect(Collectors.joining(\"&amp;\"));\n    signStr += append;\n\n    if (logger.isDebugEnabled()) logger.debug(\"\u5f85\u7b7e\u540d\u5b57\u7b26\u4e32\uff1a{}\", signStr);\n    return signer.apply(signStr);\n}\n\n\/**\n* md5 \u5927\u5199\u52a0\u5bc6\n*\/\nprotected final String md5Upper(String signStr) {\n    return md5Origin(signStr).toUpperCase();\n}\n\n\/**\n* md5 \u52a0\u5bc6\n*\/\nprotected final String md5Origin(String signStr) {\n    return DigestUtils.md5Hex(signStr);\n}\n\n\u5177\u4f53\u652f\u4ed8\u6e20\u9053\u8fdb\u884c\u7b7e\u540d\u8c03\u7528\n\n\/\/ \u8c03\u7528\u62bd\u8c61\u7c7b\u4e2d\u7684sign\u7b7e\u540d\u65b9\u6cd5\nString sign = sign(params, \"&amp;key=\" + \"\u79c1\u94a5\u5b57\u7b26\u4e32\", \"sign\"\n\/\/ \u8fd9\u91cc\u4e0d\u540c\u6e20\u9053\u7c7b\u4e2d\u4e5f\u53ef\u81ea\u5b9a\u4e49\u52a0\u5bc6\u89c4\u5219\n, this::md5Origin);\n\n\/\/ \u53e6\u5916\u4e00\u79cd\u5199\u6cd5\nString sign2 = sign(params, \"&amp;key=\" + \"\u79c1\u94a5\u5b57\u7b26\u4e32\", \"sign\"\n, (signStr) -> DigestUtils.md5Hex(signStr));\n<\/pre>\n\n\n\n<p>\u7c7b\u4f3c\u7684\u573a\u666f\u5176\u5b9e\u6709\u5f88\u591a\uff0c\u5728\u5f88\u591a\u6e90\u7801\u4f7f\u7528\u4e0a\uff0c\u90fd\u4f1a\u628a\u4e1a\u52a1\u903b\u8f91\u901a\u8fc7\u51fd\u6570\u5f0f\u5165\u53c2\uff0c\u4ea4\u7531\u4f60\u6765\u5904\u7406\u3002\u4f7f\u5f97\u6e90\u7801\u65b9\u6cd5\u7684\u516c\u7528\u6027\u4f1a\u66f4\u5f3a\uff0c\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4ec0\u4e48 \u5b9a\u4e49\uff1a \u6709\u4e14\u4ec5\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff08\u4e0d\u5305\u62ec\u9ed8\u8ba4\u65b9\u6cd5\u3001\u9759\u6001\u65b9\u6cd5\u4ee5\u53ca\u5bf9Object\u65b9\u6cd5\u7684\u91cd\u5199\uff09  [&hellip;]<\/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\/12771"}],"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=12771"}],"version-history":[{"count":3,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/12771\/revisions"}],"predecessor-version":[{"id":12781,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/12771\/revisions\/12781"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}