{"id":1212,"date":"2025-04-12T14:51:35","date_gmt":"2025-04-12T05:51:35","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/1212\/"},"modified":"2025-07-11T17:01:40","modified_gmt":"2025-07-11T08:01:40","slug":"1212","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1212\/","title":{"rendered":"\u975e\u540c\u671f\u51e6\u7406\u3068\u306f\uff1fJavaScript\u3068Java\u306e\u5b9f\u4f8b\u3067\u308f\u304b\u308b\u4f7f\u3044\u65b9\u30fb\u843d\u3068\u3057\u7a74\u30fb\u89e3\u6c7a\u6cd5"},"content":{"rendered":"<div>\n<h2>\u306a\u305c\u51e6\u7406\u304c\u201c\u6b62\u307e\u3063\u305f\u3088\u3046\u306b\u898b\u3048\u308b\u201d\u306e\u304b\uff1f<\/h2>\n<p>Web\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u3066\u3044\u3066\u3001\u6b21\u306e\u3088\u3046\u306a\u3053\u3068\u306b\u5fc3\u5f53\u305f\u308a\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<ul>\n<li>\n<p>\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u3082\u3059\u3050\u306b\u53cd\u5fdc\u304c\u306a\u3044<\/p>\n<\/li>\n<li>\n<p>\u30c7\u30fc\u30bf\u53d6\u5f97\u5f8c\u306b\u753b\u9762\u66f4\u65b0\u304c\u3046\u307e\u304f\u3044\u304b\u306a\u3044<\/p>\n<\/li>\n<li>\n<p>\u51e6\u7406\u306e\u9806\u756a\u304c\u60f3\u5b9a\u3068\u9055\u3063\u3066\u6df7\u4e71\u3059\u308b<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u73fe\u8c61\u306f\u3001\u5b9f\u306f\u300c\u975e\u540c\u671f\u51e6\u7406\u300d\u3068\u3044\u3046\u8003\u3048\u65b9\u3068\u6df1\u304f\u95a2\u4fc2\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\u521d\u3081\u3066\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5b66\u3093\u3060\u3068\u304d\u3001\u591a\u304f\u306e\u4eba\u304c\u4e0a\u304b\u3089\u9806\u306b\u51e6\u7406\u3055\u308c\u308b\u300c\u540c\u671f\u7684\u306a\u6d41\u308c\u300d\u3092\u524d\u63d0\u306b\u8003\u3048\u304c\u3061\u3067\u3059\u3002<\/p>\n<p>\u3067\u3082\u3001\u73fe\u5b9f\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3059\u3050\u306b\u7d42\u308f\u3089\u306a\u3044\u51e6\u7406\uff08\u4f8b\uff1a\u901a\u4fe1\u3084\u8aad\u307f\u8fbc\u307f\uff09\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002<br \/>\u305d\u3046\u3057\u305f\u51e6\u7406\u3092\u6b63\u3057\u304f\u6271\u308f\u306a\u3044\u3068\u3001<strong>\u753b\u9762\u304c\u56fa\u307e\u3063\u305f\u308a\u3001\u51e6\u7406\u306e\u9806\u756a\u304c\u30ba\u30ec\u305f\u308a<\/strong>\u3057\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u3046\u3057\u305f\u3068\u304d\u306b\u5fc5\u8981\u306b\u306a\u308b\u306e\u304c\u3001\u300c\u975e\u540c\u671f\u51e6\u7406\u300d\u306e\u77e5\u8b58\u3067\u3059\u3002<\/p>\n<hr>\n<h2>\u975e\u540c\u671f\u3068\u306f\uff1f\u307e\u305a\u306f\u30a4\u30e1\u30fc\u30b8\u304b\u3089\u7406\u89e3\u3057\u3088\u3046<\/h2>\n<h3>\u975e\u540c\u671f\u306e\u30a4\u30e1\u30fc\u30b8\u3092\u3064\u304b\u3080\u300c\u30e9\u30fc\u30e1\u30f3\u5c4b\u306e\u4f8b\u300d<\/h3>\n<ul>\n<li>\n<p>\u304a\u5ba2\u3055\u3093\u304c\u30e9\u30fc\u30e1\u30f3\u3092\u6ce8\u6587\u3057\u307e\u3059<\/p>\n<\/li>\n<li>\n<p>\u5e97\u54e1\u306f\u300c\u4f5c\u308a\u307e\u3059\u306d\u300d\u3068\u4f1d\u3048\u3066\u3001\u4ed6\u306e\u304a\u5ba2\u3055\u3093\u306e\u6ce8\u6587\u3092\u53d7\u3051\u306b\u884c\u304d\u307e\u3059<\/p>\n<\/li>\n<li>\n<p>\u30e9\u30fc\u30e1\u30f3\u304c\u3067\u304d\u305f\u3089\u5e97\u54e1\u304c\u30c6\u30fc\u30d6\u30eb\u306b\u6301\u3063\u3066\u304d\u307e\u3059<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u308c\u304c<strong>\u975e\u540c\u671f\u306e\u51e6\u7406<\/strong>\u3067\u3059\u3002<br \/>\u300c\u4f5c\u3063\u3066\u3044\u308b\u9593\u3001\u4ed6\u306e\u3053\u3068\u3082\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u8003\u3048\u65b9\u3067\u3059\u306d\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u30e9\u30fc\u30e1\u30f3\u304c\u3067\u304d\u308b\u307e\u3067\u305d\u306e\u5834\u306b\u7acb\u3061\u5c3d\u304f\u3057\u3066\u4f55\u3082\u3057\u306a\u3044\u5e97\u54e1\u304c\u3044\u305f\u3089\u3001\u305d\u308c\u306f<strong>\u540c\u671f\u51e6\u7406<\/strong>\u306e\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/p>\n<hr>\n<h3>\u975e\u540c\u671f\u51e6\u7406\u304c\u4f7f\u308f\u308c\u308b\u5834\u9762<\/h3>\n<ul>\n<li>\n<p>\u30b5\u30fc\u30d0\u30fc\u3068\u901a\u4fe1\u3057\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u3068\u304d<\/p>\n<\/li>\n<li>\n<p>\u30d5\u30a1\u30a4\u30eb\u3084\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u3068\u304d<\/p>\n<\/li>\n<li>\n<p>\u30bf\u30a4\u30de\u30fc\u3067\u4e00\u5b9a\u6642\u9593\u5f85\u6a5f\u3057\u305f\u3042\u3068\u306b\u51e6\u7406\u3059\u308b\u3068\u304d<\/p>\n<\/li>\n<li>\n<p>\u91cd\u305f\u3044\u8a08\u7b97\u3084\u30d5\u30a3\u30eb\u30bf\u30fc\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3068\u304d<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u3046\u3044\u3063\u305f\u51e6\u7406\u306f\u3001<strong>\u3059\u3050\u306b\u306f\u7d42\u308f\u3089\u306a\u3044<\/strong>\u305f\u3081\u3001\u975e\u540c\u671f\u3067\u6271\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<hr>\n<h3>\u540c\u671f\u51e6\u7406\u3068\u975e\u540c\u671f\u51e6\u7406\u306e\u9055\u3044<\/h3>\n<p><strong>\u540c\u671f\u51e6\u7406\u306e\u7279\u5fb4<\/strong><\/p>\n<ul>\n<li>\n<p>\u51e6\u7406\u306e\u6d41\u308c\uff1a\u4e0a\u304b\u3089\u9806\u306b\u5b9f\u884c\u3055\u308c\u308b<\/p>\n<\/li>\n<li>\n<p>\u6b21\u306e\u51e6\u7406\uff1a\u524d\u306e\u51e6\u7406\u304c\u7d42\u308f\u308b\u307e\u3067\u6b62\u307e\u308b<\/p>\n<\/li>\n<li>\n<p>\u7d50\u679c\u306e\u53d6\u5f97\uff1a\u305d\u306e\u5834\u3067\u3059\u3050\u5f97\u3089\u308c\u308b<\/p>\n<\/li>\n<li>\n<p>\u5b9f\u884c\u4f8b<\/p>\n<\/li>\n<\/ul>\n<pre><code><span>console<\/span>.log(<span>\"A\"<\/span>);\r\n<span>console<\/span>.log(<span>\"B\"<\/span>);<\/code><\/pre>\n<p><strong>\u975e\u540c\u671f\u51e6\u7406\u306e\u7279\u5fb4<\/strong><\/p>\n<ul>\n<li>\n<p>\u51e6\u7406\u306e\u6d41\u308c\uff1a\u5b8c\u4e86\u3092\u5f85\u305f\u305a\u306b\u6b21\u3078\u9032\u3080<\/p>\n<\/li>\n<li>\n<p>\u6b21\u306e\u51e6\u7406\uff1a\u88cf\u3067\u9032\u884c\u3057\u3064\u3064\u4ed6\u306e\u51e6\u7406\u3082\u9032\u3080<\/p>\n<\/li>\n<li>\n<p>\u7d50\u679c\u306e\u53d6\u5f97\uff1a\u3042\u3068\u3067\u53d7\u3051\u53d6\u308b\uff08\u901a\u77e5\u3084\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\uff09<\/p>\n<\/li>\n<li>\n<p>\u5b9f\u884c\u4f8b<\/p>\n<\/li>\n<\/ul>\n<pre><code>fetch(<span>\"data.json\"<\/span>).then(<span><span>res<\/span> =&gt;<\/span> <span>console<\/span>.log(res));<\/code><\/pre>\n<hr>\n<h2>\u5b9f\u969b\u306b\u30b3\u30fc\u30c9\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u4f53\u611f\u3057\u3066\u307f\u3088\u3046<\/h2>\n<h3>JavaScript\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u8a66\u3059<\/h3>\n<p><strong>1. setTimeout\u306b\u3088\u308b\u975e\u540c\u671f\u306e\u4f8b<\/strong><\/p>\n<pre><code><span>console<\/span>.log(<span>\"\u51e6\u74061\"<\/span>);\r\n\r\nsetTimeout(<span><span>()<\/span> =&gt;<\/span> {\r\n  <span>console<\/span>.log(<span>\"\u51e6\u74062\uff082\u79d2\u5f8c\u306b\u5b9f\u884c\uff09\"<\/span>);\r\n}, <span>2000<\/span>);\r\n\r\n<span>console<\/span>.log(<span>\"\u51e6\u74063\"<\/span>);<\/code><\/pre>\n<p><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/p>\n<ul>\n<li>\n<p>\u51e6\u74061<\/p>\n<\/li>\n<li>\n<p>\u51e6\u74063<\/p>\n<\/li>\n<li>\n<p>\u51e6\u74062\uff082\u79d2\u5f8c\uff09<\/p>\n<\/li>\n<\/ul>\n<hr>\n<p><strong>2. Promise\u3092\u4f7f\u3063\u3066\u975e\u540c\u671f\u7d50\u679c\u3092\u6271\u3046<\/strong><\/p>\n<pre><code><span><span>function<\/span> <span>getData<\/span>(<span><\/span>) <\/span>{\r\n  <span>return<\/span> <span>new<\/span> <span>Promise<\/span>(<span>(<span>resolve<\/span>) =&gt;<\/span> {\r\n    setTimeout(<span><span>()<\/span> =&gt;<\/span> {\r\n      resolve(<span>\"\u30c7\u30fc\u30bf\u53d6\u5f97\u5b8c\u4e86\"<\/span>);\r\n    }, <span>1000<\/span>);\r\n  });\r\n}\r\n\r\ngetData().then(<span>(<span>result<\/span>) =&gt;<\/span> {\r\n  <span>console<\/span>.log(result);\r\n});<\/code><\/pre>\n<hr>\n<p><strong>3. async\/await\u3067\u30b9\u30c3\u30ad\u30ea\u66f8\u304f<\/strong><\/p>\n<pre><code><span>async<\/span> <span><span>function<\/span> <span>main<\/span>(<span><\/span>) <\/span>{\r\n  <span>const<\/span> result = <span>await<\/span> getData();\r\n  <span>console<\/span>.log(result);\r\n}\r\n\r\nmain();<\/code><\/pre>\n<hr>\n<h3>Java\u3067\u3082\u975e\u540c\u671f\u51e6\u7406\u306f\u3067\u304d\u308b<\/h3>\n<p><strong>ExecutorService\u3068Future\u3092\u4f7f\u3063\u305f\u4f8b<\/strong><\/p>\n<pre><code><span>import<\/span> java.util.concurrent.*;\r\n\r\n<span>public<\/span> <span><span>class<\/span> <span>AsyncExample<\/span> <\/span>{\r\n    <span>public<\/span> <span>static<\/span> void main(<span>String<\/span>[] args) <span>throws<\/span> <span>Exception<\/span> {\r\n        <span>ExecutorService<\/span> executor = <span>Executors<\/span>.newSingleThreadExecutor();\r\n        <span>Future<\/span>&lt;<span>String<\/span>&gt; future = executor.submit(() -&gt; {\r\n            <span>Thread<\/span>.sleep(<span>2000<\/span>);\r\n            <span>return<\/span> <span>\"\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u51e6\u7406\u5b8c\u4e86\"<\/span>;\r\n        });\r\n\r\n        <span>System<\/span>.out.<span>println<\/span>(<span>\"\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9\u306f\u5148\u306b\u9032\u307f\u307e\u3059\"<\/span>);\r\n        <span>String<\/span> result = future.<span>get<\/span>(); <span>\/\/ \u7d50\u679c\u304c\u8fd4\u308b\u307e\u3067\u5f85\u6a5f<\/span>\r\n        <span>System<\/span>.out.<span>println<\/span>(result);\r\n\r\n        executor.shutdown();\r\n    }\r\n}<\/code><\/pre>\n<hr>\n<h3>\u3088\u304f\u3042\u308b\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8<\/h3>\n<p><strong>1. \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344<\/strong><\/p>\n<ul>\n<li>\n<p>\u30cd\u30b9\u30c8\u304c\u6df1\u304f\u306a\u3063\u3066\u8aad\u307f\u306b\u304f\u3044<\/p>\n<\/li>\n<li>\n<p>\u89e3\u6c7a\u7b56\uff1aPromise\u3084async\/await\u3067\u30d5\u30e9\u30c3\u30c8\u306b\u66f8\u304d\u63db\u3048\u308b<\/p>\n<\/li>\n<\/ul>\n<p><strong>2. \u975e\u540c\u671f\u3067\u5909\u6570\u304c\u3046\u307e\u304f\u6271\u3048\u306a\u3044<\/strong><\/p>\n<pre><code><span>let<\/span> result;\r\nfetch(<span>\"data.json\"<\/span>)\r\n  .then(<span><span>res<\/span> =&gt;<\/span> res.json())\r\n  .then(<span><span>data<\/span> =&gt;<\/span> {\r\n    result = data;\r\n  });\r\n\r\n<span>console<\/span>.log(result); <span>\/\/ \u307e\u3060undefined<\/span><\/code><\/pre>\n<ul>\n<li>\n<p>\u89e3\u6c7a\u7b56\uff1aasync\/await\u3067\u9806\u5e8f\u3092\u4fdd\u8a3c\u3059\u308b<\/p>\n<\/li>\n<\/ul>\n<hr>\n<h3>Before \/ After\u3067\u898b\u6bd4\u3079\u3066\u307f\u3088\u3046<\/h3>\n<p><strong>Before\uff1a\u540c\u671f\u51e6\u7406\u30673\u79d2\u9593\u30d5\u30ea\u30fc\u30ba<\/strong><\/p>\n<pre><code><span><span>function<\/span> <span>heavyTask<\/span>(<span><\/span>) <\/span>{\r\n  <span>const<\/span> start = <span>Date<\/span>.now();\r\n  <span>while<\/span> (<span>Date<\/span>.now() - start &lt; <span>3000<\/span>) {} <span>\/\/ \u30d5\u30ea\u30fc\u30ba<\/span>\r\n  <span>console<\/span>.log(<span>\"\u5b8c\u4e86\"<\/span>);\r\n}\r\nheavyTask();<\/code><\/pre>\n<p>After\uff1a\u975e\u540c\u671f\u3067\u30b5\u30af\u30b5\u30af\u8868\u793a<\/p>\n<pre><code><span><span>function<\/span> <span>heavyTask<\/span>(<span><\/span>) <\/span>{\r\n  setTimeout(<span><span>()<\/span> =&gt;<\/span> {\r\n    <span>console<\/span>.log(<span>\"\u5b8c\u4e86\uff08\u975e\u540c\u671f\uff09\"<\/span>);\r\n  }, <span>0<\/span>);\r\n}\r\nheavyTask();<\/code><\/pre>\n<hr>\n<h2>\u300c\u975e\u540c\u671f\u300d\u3092\u77e5\u308b\u3068\u3001\u30a2\u30d7\u30ea\u306f\u3082\u3063\u3068\u30b9\u30e0\u30fc\u30ba\u306b\u306a\u308b<\/h2>\n<h3>\u975e\u540c\u671f\u51e6\u7406\u306e\u7406\u89e3\u304c\u5e83\u3052\u308b\u958b\u767a\u306e\u4e16\u754c<\/h3>\n<ul>\n<li>\n<p>\u6642\u9593\u306e\u304b\u304b\u308b\u51e6\u7406\u3092\u6b62\u3081\u305a\u306b\u88cf\u3067\u52d5\u304b\u3059\u306e\u304c\u975e\u540c\u671f\u51e6\u7406<\/p>\n<\/li>\n<li>\n<p>JavaScript\u3067\u306f setTimeout \/ Promise \/ async\/await \u304c\u57fa\u672c<\/p>\n<\/li>\n<li>\n<p>Java\u3067\u306f ExecutorService \/ Future \u3092\u4f7f\u3063\u3066\u30b9\u30ec\u30c3\u30c9\u3092\u64cd\u4f5c<\/p>\n<\/li>\n<li>\n<p>\u975e\u540c\u671f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067UI\u306e\u30d5\u30ea\u30fc\u30ba\u3084\u9806\u5e8f\u30df\u30b9\u3092\u56de\u907f\u3067\u304d\u308b<\/p>\n<\/li>\n<\/ul>\n<h3>\u3010\u5916\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Guide\/Using_promises\">MDN Web Docs: Promise\u306e\u4f7f\u3044\u65b9<\/a><\/p>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Statements\/async_function\">MDN Web Docs: async function<\/a><\/p>\n<p><a href=\"https:\/\/docs.oracle.com\/javase\/jp\/8\/docs\/api\/java\/util\/concurrent\/Future.html\">Java API: Future \u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9<\/a><\/p>\n<p><a href=\"https:\/\/docs.oracle.com\/javase\/jp\/8\/docs\/api\/java\/util\/concurrent\/ExecutorService.html\">Java API: ExecutorService<\/a><\/p>\n<h3>\u3010\u5185\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/1205\/\">JavaScript\u3067CORS\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u3068\u304d\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\u3092\u5fb9\u5e95\u89e3\u8aac<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/1128\/\">JavaScript\u306eAjax\u5b8c\u5168\u5165\u9580\uff5cfetch\u306e\u4f7f\u3044\u65b9\u30fbCORS\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u30fb\u975e\u540c\u671f\u901a\u4fe1\u306e\u57fa\u672c\u3092\u89e3\u8aac<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/1109\/\">JavaScript\u3067\u3088\u304f\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u300cReferenceError\u300d\u300cSyntaxError\u300d\u306a\u3069\u306e\u539f\u56e0\u3068\u5bfe\u7b56\u3092\u5177\u4f53\u4f8b\u4ed8\u304d\u3067\u89e3\u8aac<\/a><\/p>\n<\/div>\n","protected":false},"featured_media":1213,"template":"","_links":{"self":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route\/1212"}],"collection":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route"}],"about":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/types\/route"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media\/1213"}],"wp:attachment":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media?parent=1212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}