{"id":313,"date":"2025-01-01T09:00:49","date_gmt":"2025-01-01T01:00:49","guid":{"rendered":"https:\/\/trantor.ink\/?p=313"},"modified":"2025-01-01T09:00:49","modified_gmt":"2025-01-01T01:00:49","slug":"java-%e4%b8%ad%e7%9a%84-supplier-%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/trantor.ink\/?p=313","title":{"rendered":"java \u4e2d\u7684 Supplier \u63a5\u53e3"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/trantor.ink\/?p=313\/#Supplier_%E6%8E%A5%E5%8F%A3%E7%9A%84%E5%AE%9A%E4%B9%89\" >Supplier \u63a5\u53e3\u7684\u5b9a\u4e49<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/trantor.ink\/?p=313\/#Supplier_%E7%9A%84%E5%85%B8%E5%9E%8B%E7%94%A8%E6%B3%95\" >Supplier \u7684\u5178\u578b\u7528\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/trantor.ink\/?p=313\/#%E4%BD%BF%E7%94%A8%E7%A4%BA%E4%BE%8B\" >\u4f7f\u7528\u793a\u4f8b<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/trantor.ink\/?p=313\/#1_%E5%9F%BA%E6%9C%AC%E7%94%A8%E6%B3%95\" >1. \u57fa\u672c\u7528\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/trantor.ink\/?p=313\/#2_%E5%BB%B6%E8%BF%9F%E8%AE%A1%E7%AE%97\" >2. \u5ef6\u8fdf\u8ba1\u7b97<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/trantor.ink\/?p=313\/#3_%E4%B8%8E%E5%85%B6%E4%BB%96_API_%E7%BB%93%E5%90%88\" >3. \u4e0e\u5176\u4ed6 API \u7ed3\u5408<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/trantor.ink\/?p=313\/#4_%E8%87%AA%E5%AE%9A%E4%B9%89%E5%B7%A5%E5%8E%82%E6%96%B9%E6%B3%95\" >4. \u81ea\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/trantor.ink\/?p=313\/#%E6%80%BB%E7%BB%93\" >\u603b\u7ed3<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>\u5728 Java \u4e2d\uff0c<code>Supplier<\/code> \u662f\u4e00\u4e2a\u529f\u80fd\u6027\u63a5\u53e3\uff0c\u5b83\u6765\u81ea\u4e8e <code>java.util.function<\/code> \u5305\u3002<code>Supplier<\/code> \u63a5\u53e3\u4ee3\u8868\u4e00\u4e2a\u63d0\u4f9b\u7ed3\u679c\u7684\u4f9b\u5e94\u5546\uff0c\u5b83\u4e0d\u63a5\u53d7\u4efb\u4f55\u53c2\u6570\uff0c\u4f46\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u3002\u5e38\u7528\u4e8e\u5ef6\u8fdf\u8ba1\u7b97\u3001\u5de5\u5382\u6a21\u5f0f\u548c\u5176\u4ed6\u573a\u666f\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f <code>Supplier<\/code> \u7684\u7b80\u5355\u89e3\u91ca\u548c\u7528\u6cd5\u793a\u4f8b\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Supplier_%E6%8E%A5%E5%8F%A3%E7%9A%84%E5%AE%9A%E4%B9%89\"><\/span>Supplier \u63a5\u53e3\u7684\u5b9a\u4e49<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@FunctionalInterface\npublic interface Supplier&lt;T> {\n    T get();\n}<\/pre>\n\n\n\n<p><code>Supplier<\/code> \u63a5\u53e3\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5 <code>get()<\/code>\uff0c\u5b83\u4e0d\u63a5\u53d7\u4efb\u4f55\u53c2\u6570\uff0c\u4f46\u4f1a\u8fd4\u56de\u4e00\u4e2a\u7c7b\u578b\u4e3a <code>T<\/code> \u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Supplier_%E7%9A%84%E5%85%B8%E5%9E%8B%E7%94%A8%E6%B3%95\"><\/span>Supplier \u7684\u5178\u578b\u7528\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5ef6\u8fdf\u8ba1\u7b97<\/strong>\uff1a\u5f53\u4f60\u5e0c\u671b\u67d0\u4e2a\u503c\u5728\u9700\u8981\u7684\u65f6\u5019\u624d\u8fdb\u884c\u8ba1\u7b97\u3002<\/li>\n\n\n\n<li><strong>\u5de5\u5382\u6a21\u5f0f<\/strong>\uff1a\u901a\u8fc7 <code>Supplier<\/code> \u63d0\u4f9b\u5b9e\u4f8b\u5316\u5bf9\u8c61\u7684\u65b9\u5f0f\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E7%A4%BA%E4%BE%8B\"><\/span>\u4f7f\u7528\u793a\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_%E5%9F%BA%E6%9C%AC%E7%94%A8%E6%B3%95\"><\/span>1. \u57fa\u672c\u7528\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 <code>Supplier<\/code> \u6765\u63d0\u4f9b\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" 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 SupplierExample {\n    public static void main(String[] args) {\n        Supplier&lt;String> stringSupplier = () -> \"Hello, World!\";\n        System.out.println(stringSupplier.get());  \/\/ \u8f93\u51fa: Hello, World!\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_%E5%BB%B6%E8%BF%9F%E8%AE%A1%E7%AE%97\"><\/span>2. \u5ef6\u8fdf\u8ba1\u7b97<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u4f7f\u7528 <code>Supplier<\/code> \u53ef\u4ee5\u5b9e\u73b0\u5ef6\u8fdf\u8ba1\u7b97\uff0c\u8fd9\u5728\u9700\u8981\u60f0\u6027\u52a0\u8f7d\uff08Lazy Loading\uff09\u7684\u573a\u666f\u4e2d\u7279\u522b\u6709\u7528\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" 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 LazyLoadingExample {\n    public static void main(String[] args) {\n        Supplier&lt;Double> randomSupplier = () -> Math.random();\n        System.out.println(\"Random value: \" + randomSupplier.get());\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_%E4%B8%8E%E5%85%B6%E4%BB%96_API_%E7%BB%93%E5%90%88\"><\/span>3. \u4e0e\u5176\u4ed6 API \u7ed3\u5408<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5728 Java 8 \u4e2d\uff0c\u8bb8\u591a\u65b0\u7684 API \u65b9\u6cd5\u90fd\u63a5\u53d7 <code>Supplier<\/code> \u53c2\u6570\u3002\u4f8b\u5982\uff0c<code>Optional.orElseGet()<\/code> \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a <code>Supplier<\/code> \u6765\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.Optional;\n\npublic class OptionalExample {\n    public static void main(String[] args) {\n        Optional&lt;String> optional = Optional.empty();\n        System.out.println(optional.orElseGet(() -> \"Default Value\"));  \/\/ \u8f93\u51fa: Default Value\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_%E8%87%AA%E5%AE%9A%E4%B9%89%E5%B7%A5%E5%8E%82%E6%96%B9%E6%B3%95\"><\/span>4. \u81ea\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u4f7f\u7528 <code>Supplier<\/code> \u53ef\u4ee5\u5b9e\u73b0\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\uff0c\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.util.function.Supplier;\n\nclass Car {\n    private String name;\n\n    public Car(String name) {\n        this.name = name;\n    }\n\n    @Override\n    public String toString() {\n        return \"Car{name='\" + name + \"'}\";\n    }\n}\n\npublic class FactoryExample {\n    public static void main(String[] args) {\n        Supplier&lt;Car> carFactory = () -> new Car(\"Tesla\");\n        Car car = carFactory.get();\n        System.out.println(car);  \/\/ \u8f93\u51fa: Car{name='Tesla'}\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%80%BB%E7%BB%93\"><\/span>\u603b\u7ed3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><code>Supplier<\/code> \u662f\u4e00\u4e2a\u7b80\u5355\u800c\u5f3a\u5927\u7684\u529f\u80fd\u6027\u63a5\u53e3\uff0c\u5e7f\u6cdb\u7528\u4e8e\u5ef6\u8fdf\u8ba1\u7b97\u3001\u60f0\u6027\u52a0\u8f7d\u548c\u5de5\u5382\u6a21\u5f0f\u3002\u901a\u8fc7\u4f7f\u7528 <code>Supplier<\/code>\uff0c\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u7075\u6d3b\u548c\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u4e2d\uff0cSupplier \u662f\u4e00\u4e2a\u529f\u80fd\u6027\u63a5\u53e3\uff0c\u5b83\u6765\u81ea\u4e8e java.util.function \u5305\u3002Supplier \u63a5\u53e3\u4ee3\u8868\u4e00\u4e2a\u63d0\u4f9b\u7ed3\u679c\u7684\u4f9b\u5e94\u5546\uff0c\u5b83\u4e0d\u63a5\u53d7\u4efb\u4f55\u53c2\u6570\uff0c\u4f46\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u3002\u5e38\u7528\u4e8e\u5ef6\u8fdf\u8ba1\u7b97\u3001\u5de5\u5382\u6a21\u5f0f\u548c\u5176\u4ed6\u573a\u666f\u3002 \u4ee5\u4e0b\u662f Supplier \u7684\u7b80\u5355\u89e3\u91ca\u548c\u7528\u6cd5\u793a\u4f8b\uff1a Supplier \u63a5\u53e3\u7684\u5b9a\u4e49 Supplier \u63a5\u53e3\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5 get()\uff0c\u5b83\u4e0d\u63a5\u53d7\u4efb\u4f55\u53c2\u6570\uff0c\u4f46\u4f1a\u8fd4\u56de\u4e00\u4e2a\u7c7b\u578b\u4e3a T \u7684\u5bf9\u8c61\u3002 Supplier \u7684\u5178\u578b\u7528\u6cd5 \u4f7f\u7528\u793a\u4f8b 1. \u57fa\u672c\u7528\u6cd5 \u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 Supplier \u6765\u63d0\u4f9b\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1a 2. \u5ef6\u8fdf\u8ba1\u7b97 \u4f7f\u7528 Supplier \u53ef\u4ee5\u5b9e\u73b0\u5ef6\u8fdf\u8ba1\u7b97\uff0c\u8fd9\u5728\u9700\u8981\u60f0\u6027\u52a0\u8f7d\uff08Lazy Loading\uff09\u7684\u573a\u666f\u4e2d\u7279\u522b\u6709\u7528\uff1a 3. \u4e0e\u5176\u4ed6 API \u7ed3\u5408 \u5728 Java 8 \u4e2d\uff0c\u8bb8\u591a\u65b0\u7684 API \u65b9\u6cd5\u90fd\u63a5\u53d7 Supplier \u53c2\u6570\u3002\u4f8b\u5982\uff0cOptional.orElseGet() \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a Supplier \u6765\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff1a 4. \u81ea\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5 \u4f7f\u7528 Supplier \u53ef\u4ee5\u5b9e\u73b0\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\uff0c\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff1a \u603b\u7ed3 Supplier \u662f\u4e00\u4e2a\u7b80\u5355\u800c\u5f3a\u5927\u7684\u529f\u80fd\u6027\u63a5\u53e3\uff0c\u5e7f\u6cdb\u7528\u4e8e\u5ef6\u8fdf\u8ba1\u7b97\u3001\u60f0\u6027\u52a0\u8f7d\u548c\u5de5\u5382\u6a21\u5f0f\u3002\u901a\u8fc7\u4f7f\u7528 Supplier\uff0c\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u7075\u6d3b\u548c\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[39],"class_list":["post-313","post","type-post","status-publish","format-standard","hentry","category-dev","tag-java"],"_links":{"self":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=313"}],"version-history":[{"count":1,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions"}],"predecessor-version":[{"id":314,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions\/314"}],"wp:attachment":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}