{"id":1555,"date":"2026-06-08T08:59:15","date_gmt":"2026-06-08T00:59:15","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1555"},"modified":"2026-06-08T08:59:16","modified_gmt":"2026-06-08T00:59:16","slug":"%e3%80%90java%e3%80%91optional-%e7%b1%bb%e5%85%a8%e9%9d%a2%e8%af%a6%e8%a7%a3%ef%bc%8c%e5%91%8a%e5%88%ab%e7%a9%ba%e6%8c%87%e9%92%88%e5%bc%82%e5%b8%b8","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1555","title":{"rendered":"\u3010Java\u3011Optional \u7c7b\u5168\u9762\u8be6\u89e3\uff0c\u544a\u522b\u7a7a\u6307\u9488\u5f02\u5e38"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6700\u8fd1\u5728\u590d\u76d8 Java \u57fa\u7840\u77e5\u8bc6\u70b9\uff0c\u53d1\u73b0\u5f88\u591a\u5c0f\u4f19\u4f34\u4f9d\u65e7\u4f1a\u88ab<strong>\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09<\/strong> \u56f0\u6270\u3002\u4ece Java 8 \u5f00\u59cb\uff0c\u5b98\u65b9\u63a8\u51fa\u4e86 <code>Optional<\/code> \u5de5\u5177\u7c7b\uff0c\u5b83\u7684\u6838\u5fc3\u4f5c\u7528\u5c31\u662f\u4f18\u96c5\u5730\u5904\u7406\u7a7a\u503c\uff0c\u4ece\u6839\u6e90\u4e0a\u89c4\u907f\u7a7a\u6307\u9488\u95ee\u9898\u3002\u4eca\u5929\u8fd9\u7bc7\u6587\u7ae0\uff0c\u6211\u5c31\u5e26\u5927\u5bb6\u5b8c\u6574\u68b3\u7406 <code>Optional<\/code> \u7684\u4f7f\u7528\u65b9\u5f0f\uff0c\u642d\u914d\u5b9e\u6218\u4ee3\u7801\uff0c\u4e00\u8d77\u6765\u5b66\u4e60\u5427\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u8ba4\u8bc6 Optional \u4e0e\u521b\u5efa\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Optional<\/code> \u662f\u4e00\u4e2a\u5bb9\u5668\u7c7b\uff0c\u53ef\u4ee5\u5b58\u653e\u5355\u4e2a\u503c\uff0c\u8fd9\u4e2a\u503c\u53ef\u4ee5\u662f<strong>\u975e\u7a7a<\/strong>\uff0c\u4e5f\u53ef\u4ee5\u662f<strong>\u7a7a<\/strong>\u3002\u5b83\u4e00\u5171\u63d0\u4f9b\u4e86\u4e09\u79cd\u5e38\u7528\u65b9\u5f0f\u6765\u521b\u5efa\u5b9e\u4f8b\uff0c\u4e0d\u540c\u65b9\u6cd5\u9002\u7528\u573a\u666f\u4e0d\u540c\uff0c\u5927\u5bb6\u4e00\u5b9a\u8981\u533a\u5206\u6e05\u695a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. empty ()\uff1a\u521b\u5efa\u7a7a\u7684 Optional \u5bf9\u8c61<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u4e0d\u5305\u542b\u4efb\u4f55\u503c\u7684 <code>Optional<\/code>\uff0c\u76f4\u63a5\u8c03\u7528\u9759\u6001\u65b9\u6cd5 <code>empty()<\/code> \u5373\u53ef\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684 Optional \u5bf9\u8c61\nOptional&lt;String&gt; emptyOpt = Optional.empty();\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. of ()\uff1a\u521b\u5efa\u975e\u7a7a Optional \u5bf9\u8c61<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>of()<\/code> \u65b9\u6cd5\u8981\u6c42\u4f20\u5165\u7684\u53c2\u6570<strong>\u7edd\u5bf9\u4e0d\u80fd\u4e3a null<\/strong>\uff0c\u4e00\u65e6\u4f20\u5165\u7a7a\u503c\uff0c\u4f1a\u76f4\u63a5\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u9002\u5408\u6211\u4eec\u660e\u786e\u77e5\u9053\u6570\u636e\u4e00\u5b9a\u4e0d\u4e3a\u7a7a\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4f20\u5165\u975e\u7a7a\u5b57\u7b26\u4e32\uff0c\u6b63\u5e38\u521b\u5efa\u5bf9\u8c61\nOptional&lt;String&gt; opt = Optional.of(\"\u4e91\u626c\");\n\n\/\/ \u4e0b\u9762\u8fd9\u884c\u4ee3\u7801\u4f1a\u76f4\u63a5\u629b\u51fa NullPointerException\n\/\/ Optional&lt;String&gt; errorOpt = Optional.of(null);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. ofNullable ()\uff1a\u517c\u5bb9\u7a7a\u4e0e\u975e\u7a7a\uff08\u6700\u5e38\u7528\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u65e5\u5e38\u5f00\u53d1\u4e2d\u4f7f\u7528\u6700\u591a\u7684\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u63a5\u6536 <code>null<\/code> \u548c\u975e\u7a7a\u503c\uff0c\u53c2\u6570\u4e3a\u7a7a\u65f6\u7b49\u4ef7\u4e8e <code>empty()<\/code>\uff0c\u4e0d\u4e3a\u7a7a\u5219\u548c <code>of()<\/code> \u6548\u679c\u4e00\u81f4\uff0c\u901a\u7528\u6027\u6700\u5f3a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String name1 = \"Java\u5b66\u4e60\";\nString name2 = null;\n\n\/\/ \u975e\u7a7a\u503c\nOptional&lt;String&gt; opt1 = Optional.ofNullable(name1);\n\/\/ \u7a7a\u503c\nOptional&lt;String&gt; opt2 = Optional.ofNullable(name2);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u5224\u65ad Optional \u4e2d\u662f\u5426\u5b58\u5728\u503c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u62ff\u5230 <code>Optional<\/code> \u5bf9\u8c61\u540e\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u5224\u65ad\u5185\u90e8\u662f\u5426\u5b58\u6709\u6709\u6548\u503c\uff0c\u8fd9\u91cc\u6709\u4e24\u7ec4\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. isPresent ()\uff1a\u5224\u65ad\u503c\u662f\u5426\u5b58\u5728<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5bb9\u5668\u5185\u6709\u503c\uff0c\u8fd4\u56de <code>true<\/code>\uff1b\u503c\u4e3a <code>null<\/code>\uff0c\u8fd4\u56de <code>false<\/code>\u3002Java 8 \u53ca\u4ee5\u4e0a\u7248\u672c\u5747\u652f\u6301\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;String&gt; opt = Optional.of(\"\u4e91\u626c\");\nOptional&lt;String&gt; nullOpt = Optional.ofNullable(null);\n\n\/\/ \u8f93\u51fa true\nSystem.out.println(opt.isPresent());\n\/\/ \u8f93\u51fa false\nSystem.out.println(nullOpt.isPresent());\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. isEmpty ()\uff1a\u5224\u65ad\u503c\u662f\u5426\u4e3a\u7a7a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be5\u65b9\u6cd5\u662f <strong>Java 11<\/strong> \u65b0\u589e\u7684\uff0c\u4f5c\u7528\u548c <code>isPresent()<\/code> \u5b8c\u5168\u76f8\u53cd\uff0c\u7528\u6765\u5224\u65ad\u5bb9\u5668\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;String&gt; opt = Optional.of(\"\u4e91\u626c\");\nOptional&lt;String&gt; nullOpt = Optional.ofNullable(null);\n\n\/\/ \u8f93\u51fa false\nSystem.out.println(opt.isEmpty());\n\/\/ \u8f93\u51fa true\nSystem.out.println(nullOpt.isEmpty());\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u51fd\u6570\u5f0f\u5904\u7406\u503c\uff1aifPresent \u7cfb\u5217\u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Optional<\/code> \u7ed3\u5408\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b\u601d\u60f3\uff0c<code>ifPresent<\/code> \u7cfb\u5217\u65b9\u6cd5\u53ef\u4ee5\u7b80\u5316\u7a7a\u503c\u5224\u65ad\u540e\u7684\u4e1a\u52a1\u903b\u8f91\uff0c\u66ff\u4ee3\u4f20\u7edf\u7684 <code>if (obj != null)<\/code> \u5199\u6cd5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. ifPresent ()\uff1a\u503c\u5b58\u5728\u5219\u6267\u884c\u903b\u8f91<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 <code>Optional<\/code> \u4e2d\u6709\u503c\u65f6\uff0c\u6267\u884c\u4f20\u5165\u7684 Lambda \u8868\u8fbe\u5f0f\uff1b\u4e3a\u7a7a\u5219\u4e0d\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;String&gt; opt = Optional.of(\"\u4e91\u626c\");\n\/\/ \u503c\u5b58\u5728\uff0c\u6267\u884c\u6253\u5370\u5b57\u7b26\u4e32\u957f\u5ea6\nopt.ifPresent(str -&gt; System.out.println(\"\u5b57\u7b26\u4e32\u957f\u5ea6\uff1a\" + str.length()));\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. ifPresentOrElse ()\uff1aJava 9 \u65b0\u589e\uff0c\u53cc\u5206\u652f\u903b\u8f91<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f Java 9 \u63a8\u51fa\u7684\u589e\u5f3a\u65b9\u6cd5\uff0c\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff1a\u503c\u5b58\u5728\u6267\u884c\u7b2c\u4e00\u4e2a\u903b\u8f91\uff0c\u503c\u4e3a\u7a7a\u5219\u6267\u884c\u7b2c\u4e8c\u4e2a\u903b\u8f91\uff0c\u5b8c\u7f8e\u5b9e\u73b0\u300c\u5b58\u5728\u5219\u5904\u7406\uff0c\u4e0d\u5b58\u5728\u5219\u515c\u5e95\u300d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;String&gt; opt = Optional.ofNullable(null);\nopt.ifPresentOrElse(\n    str -&gt; System.out.println(\"\u503c\u4e3a\uff1a\" + str),\n    () -&gt; System.out.println(\"Optional \u4e3a\u7a7a\")\n);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff0c\u4f18\u96c5\u83b7\u53d6\u6570\u636e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u573a\u666f\u4e0b\uff0c\u5f53 <code>Optional<\/code> \u4e3a\u7a7a\u65f6\uff0c\u6211\u4eec\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u8fd9\u91cc\u4e3b\u8981\u4f7f\u7528 <code>orElse()<\/code> \u548c <code>orElseGet()<\/code> \u4e24\u4e2a\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. orElse()<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e0\u8bba <code>Optional<\/code> \u662f\u5426\u4e3a\u7a7a\uff0c<strong>\u9ed8\u8ba4\u503c\u90fd\u4f1a\u63d0\u524d\u521b\u5efa<\/strong>\u3002\u4e3a\u7a7a\u65f6\u8fd4\u56de\u8bbe\u5b9a\u7684\u9ed8\u8ba4\u503c\uff0c\u4e0d\u4e3a\u7a7a\u5219\u8fd4\u56de\u539f\u6709\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String userName = null;\n\/\/ userName \u4e3a null\uff0c\u8fd4\u56de\u9ed8\u8ba4\u503c \"\u9ed8\u8ba4\u7528\u6237\u540d\"\nString result = Optional.ofNullable(userName).orElse(\"\u9ed8\u8ba4\u7528\u6237\u540d\");\nSystem.out.println(result);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. orElseGet()<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u6570\u4e3a\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c<strong>\u53ea\u6709\u5f53 Optional \u4e3a\u7a7a\u65f6\uff0c\u624d\u4f1a\u6267\u884c\u51fd\u6570\u751f\u6210\u9ed8\u8ba4\u503c<\/strong>\uff0c\u6027\u80fd\u4f18\u4e8e <code>orElse()<\/code>\uff0c\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String userName = null;\nString result = Optional.ofNullable(userName)\n        .orElseGet(() -&gt; \"\u9ed8\u8ba4\u7528\u6237\u540d\");\nSystem.out.println(result);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u8865\u5145\uff1aget () \u65b9\u6cd5\uff08\u4e0d\u63a8\u8350\u4f7f\u7528\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>get()<\/code> \u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5bb9\u5668\u5185\u7684\u503c\uff0c\u4f46\u5982\u679c <code>Optional<\/code> \u4e3a\u7a7a\uff0c\u4f1a\u629b\u51fa <code>NoSuchElementException<\/code> \u5f02\u5e38\uff0c\u5931\u53bb\u4e86 <code>Optional<\/code> \u9632\u7a7a\u6307\u9488\u7684\u610f\u4e49\uff0c\u65e5\u5e38\u5f00\u53d1\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;String&gt; opt = Optional.of(\"\u4e91\u626c\");\n\/\/ \u6b63\u5e38\u53d6\u503c\nSystem.out.println(opt.get());\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u8fc7\u6ee4\u503c\uff1afilter () \u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>filter()<\/code> \u63a5\u6536\u4e00\u4e2a\u65ad\u8a00\u51fd\u6570\u5f0f\u63a5\u53e3 <code>Predicate<\/code>\uff0c\u53ef\u4ee5\u6309\u7167\u81ea\u5b9a\u4e49\u6761\u4ef6\u8fc7\u6ee4 <code>Optional<\/code> \u4e2d\u7684\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6ee1\u8db3\u6761\u4ef6\uff1a\u8fd4\u56de\u539f <code>Optional<\/code> \u5bf9\u8c61\uff1b<\/li>\n\n\n\n<li>\u4e0d\u6ee1\u8db3\u6761\u4ef6 \/ \u539f\u5bf9\u8c61\u4e3a\u7a7a\uff1a\u8fd4\u56de\u7a7a\u7684 <code>Optional<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u7528\u6765\u505a\u6570\u636e\u7b5b\u9009\u3001\u6761\u4ef6\u6821\u9a8c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u7b5b\u9009\u957f\u5ea6\u5927\u4e8e 3 \u7684\u5b57\u7b26\u4e32\nOptional&lt;String&gt; opt = Optional.of(\"Java\u7f16\u7a0b\");\nOptional&lt;String&gt; filterOpt = opt.filter(str -&gt; str.length() &gt; 3);\nfilterOpt.ifPresent(System.out::println);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u8f6c\u6362\u503c\uff1amap () \u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6211\u4eec\u9700\u8981\u5bf9 <code>Optional<\/code> \u5185\u90e8\u7684\u503c\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3001\u6570\u636e\u52a0\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>map()<\/code> \u65b9\u6cd5\u3002\u5b83\u4f1a\u5bf9\u503c\u8fdb\u884c\u5904\u7406\uff0c\u5e76\u5c01\u88c5\u6210\u65b0\u7684 <code>Optional<\/code> \u5bf9\u8c61\u8fd4\u56de\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5c06\u5b57\u7b26\u4e32\u8f6c\u4e3a\u5927\u5199\uff0c\u5e76\u91cd\u65b0\u5c01\u88c5\u4e3a Optional\nOptional&lt;String&gt; opt = Optional.of(\"yunyang\");\nOptional&lt;String&gt; upperOpt = opt.map(String::toUpperCase);\nupperOpt.ifPresent(System.out::println);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Optional<\/code> \u5e76\u4e0d\u662f\u7528\u6765\u5b8c\u5168\u66ff\u4ee3 <code>null<\/code>\uff0c\u800c\u662f\u63d0\u4f9b\u4e00\u5957<strong>\u89c4\u8303\u3001\u4f18\u96c5<\/strong>\u7684\u7a7a\u503c\u5904\u7406\u65b9\u6848\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u7ed9\u5927\u5bb6\u51e0\u4e2a\u5c0f\u5efa\u8bae\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u521b\u5efa\u5bf9\u8c61\u4f18\u5148\u4f7f\u7528 <code>ofNullable()<\/code>\uff0c\u517c\u5bb9\u6027\u6700\u5f3a\uff1b<\/li>\n\n\n\n<li>\u83b7\u53d6\u503c\u4f18\u5148\u4f7f\u7528 <code>orElseGet()<\/code>\uff0c\u5c11\u7528 <code>get()<\/code>\uff1b<\/li>\n\n\n\n<li>\u7ed3\u5408 <code>ifPresent<\/code>\u3001<code>filter<\/code>\u3001<code>map<\/code> \u94fe\u5f0f\u7f16\u7a0b\uff0c\u7b80\u5316\u4ee3\u7801\uff1b<\/li>\n\n\n\n<li>\u5408\u7406\u5229\u7528\u7248\u672c\u7279\u6027\uff0cJava 9+ \u53ef\u4ee5\u4f7f\u7528 <code>ifPresentOrElse<\/code>\uff0cJava 11+ \u53ef\u7528 <code>isEmpty<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u638c\u63e1\u597d <code>Optional<\/code>\uff0c\u80fd\u5927\u5e45\u51cf\u5c11\u9879\u76ee\u4e2d\u7684\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u8ba9\u4ee3\u7801\u66f4\u52a0\u5065\u58ee\u3002\u540e\u7eed\u6211\u4e5f\u4f1a\u6301\u7eed\u66f4\u65b0 Java\u3001MySQL\u3001Linux \u7b49\u540e\u7aef\u6280\u672f\u5185\u5bb9\uff0c\u5927\u5bb6\u53ef\u4ee5\u6301\u7eed\u5173\u6ce8\uff5e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6700\u8fd1\u5728\u590d\u76d8 Java \u57fa\u7840\u77e5\u8bc6\u70b9\uff0c\u53d1\u73b0\u5f88\u591a\u5c0f\u4f19\u4f34\u4f9d\u65e7\u4f1a\u88ab\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerExcept<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1555\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":1556,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1555"}],"version-history":[{"count":3,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1555\/revisions"}],"predecessor-version":[{"id":1559,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1555\/revisions\/1559"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1556"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}