{"id":740,"date":"2023-11-05T18:30:20","date_gmt":"2022-10-13T03:26:30","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aefuturetask%e3%81%ae%e4%be%8b%e9%a1%8c%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0\/"},"modified":"2025-08-01T02:04:47","modified_gmt":"2025-07-31T17:04:47","slug":"java%e3%81%aefuturetask%e3%81%ae%e4%be%8b%e9%a1%8c%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aefuturetask%e3%81%ae%e4%be%8b%e9%a1%8c%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0\/","title":{"rendered":"Java\u306eFutureTask\u306e\u4f8b\u984c\u306e\u30d7\u30ed\u30b0\u30e9\u30e0"},"content":{"rendered":"<p>\u4ee5\u524d\u3001\u79c1\u306fJava Callable Future\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3064\u3044\u3066\u306e\u6295\u7a3f\u3092\u66f8\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b9\u30ec\u30c3\u30c9\u306e\u540c\u6642\u51e6\u7406\u306e\u5229\u70b9\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u547c\u3073\u51fa\u3057\u5143\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u5024\u3092\u8fd4\u3059\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002FutureTask\u306fFuture\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c\u7684\u306a\u5177\u8c61\u5b9f\u88c5\u3067\u3042\u308a\u3001\u975e\u540c\u671f\u51e6\u7406\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30bf\u30b9\u30af\u3092\u958b\u59cb\u304a\u3088\u3073\u30ad\u30e3\u30f3\u30bb\u30eb\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u304a\u3088\u3073FutureTask\u306e\u5b8c\u4e86\u72b6\u614b\u3084\u30ad\u30e3\u30f3\u30bb\u30eb\u72b6\u614b\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3082\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002FutureTask\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u306f\u547c\u3073\u51fa\u3057\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5fc5\u8981\u3067\u3042\u308a\u3001\u305d\u306e\u5f8c\u3001Java\u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u30a8\u30b0\u30bc\u30ad\u30e5\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3053\u308c\u3089\u3092\u975e\u540c\u671f\u306b\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002FutureTask\u3092\u4f7f\u7528\u3057\u305f\u30b7\u30f3\u30d7\u30eb\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002FutureTask\u306f\u547c\u3073\u51fa\u3057\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5fc5\u8981\u3068\u3059\u308b\u305f\u3081\u3001\u30b7\u30f3\u30d7\u30eb\u306aCallable\u306e\u5b9f\u88c5\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.threads;\r\n\r\nimport java.util.concurrent.Callable;\r\n\r\npublic class MyCallable implements Callable&lt;String&gt; {\r\n\r\n\tprivate long waitTime;\r\n\t\r\n\tpublic MyCallable(int timeInMillis){\r\n\t\tthis.waitTime=timeInMillis;\r\n\t}\r\n\t@Override\r\n\tpublic String call() throws Exception {\r\n\t\tThread.sleep(waitTime);\r\n        \/\/return the thread name executing this callable task\r\n        return Thread.currentThread().getName();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306fFutureTask\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\u3067\u3042\u308a\u3001\u305d\u308c\u306fFutureTask\u306e\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.threads;\r\n\r\nimport java.util.concurrent.ExecutionException;\r\nimport java.util.concurrent.ExecutorService;\r\nimport java.util.concurrent.Executors;\r\nimport java.util.concurrent.FutureTask;\r\nimport java.util.concurrent.TimeUnit;\r\nimport java.util.concurrent.TimeoutException;\r\n\r\npublic class FutureTaskExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMyCallable callable1 = new MyCallable(1000);\r\n\t\tMyCallable callable2 = new MyCallable(2000);\r\n\r\n\t\tFutureTask&lt;String&gt; futureTask1 = new FutureTask&lt;String&gt;(callable1);\r\n\t\tFutureTask&lt;String&gt; futureTask2 = new FutureTask&lt;String&gt;(callable2);\r\n\r\n\t\tExecutorService executor = Executors.newFixedThreadPool(2);\r\n\t\texecutor.execute(futureTask1);\r\n\t\texecutor.execute(futureTask2);\r\n\t\t\r\n\t\twhile (true) {\r\n\t\t\ttry {\r\n\t\t\t\tif(futureTask1.isDone() &amp;&amp; futureTask2.isDone()){\r\n\t\t\t\t\tSystem.out.println(\"Done\");\r\n\t\t\t\t\t\/\/shut down executor service\r\n\t\t\t\t\texecutor.shutdown();\r\n\t\t\t\t\treturn;\r\n\t\t\t\t}\r\n\t\t\t\t\r\n\t\t\t\tif(!futureTask1.isDone()){\r\n\t\t\t\t\/\/wait indefinitely for future task to complete\r\n\t\t\t\tSystem.out.println(\"FutureTask1 output=\"+futureTask1.get());\r\n\t\t\t\t}\r\n\t\t\t\t\r\n\t\t\t\tSystem.out.println(\"Waiting for FutureTask2 to complete\");\r\n\t\t\t\tString s = futureTask2.get(200L, TimeUnit.MILLISECONDS);\r\n\t\t\t\tif(s !=null){\r\n\t\t\t\t\tSystem.out.println(\"FutureTask2 output=\"+s);\r\n\t\t\t\t}\r\n\t\t\t} catch (InterruptedException | ExecutionException e) {\r\n\t\t\t\te.printStackTrace();\r\n\t\t\t}catch(TimeoutException e){\r\n\t\t\t\t\/\/do nothing\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4e00\u6642\u7684\u306b\u4f55\u3082\u5370\u5237\u3055\u308c\u306a\u3044\u3053\u3068\u306b\u6c17\u4ed8\u304f\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u306f\u3001FutureTask\u306eget()\u30e1\u30bd\u30c3\u30c9\u304c\u30bf\u30b9\u30af\u306e\u5b8c\u4e86\u3092\u5f85\u3063\u3066\u304b\u3089\u51fa\u529b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u305f\u3081\u3067\u3059\u3002\u307e\u305f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6642\u9593\u306e\u307f\u5f85\u3064\u305f\u3081\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u5b58\u5728\u3057\u3001futureTask2\u3067\u306f\u305d\u308c\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001isDone()\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u306b\u3082\u6ce8\u610f\u3057\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3059\u3079\u3066\u306e\u30bf\u30b9\u30af\u304c\u5b9f\u884c\u3055\u308c\u305f\u5f8c\u306b\u7d42\u4e86\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>FutureTask1 output=pool-1-thread-1\r\nWaiting for FutureTask2 to complete\r\nWaiting for FutureTask2 to complete\r\nWaiting for FutureTask2 to complete\r\nWaiting for FutureTask2 to complete\r\nWaiting for FutureTask2 to complete\r\nFutureTask2 output=pool-1-thread-2\r\nDone\r\n<\/code><\/pre>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001FutureTask\u306b\u306f\u5229\u70b9\u304c\u306a\u3044\u304c\u3001Future\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e00\u90e8\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u3044\u5834\u5408\u3084\u3001Future\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u524d\u3001\u79c1\u306fJava Callable Future\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3064\u3044\u3066\u306e\u6295\u7a3f\u3092\u66f8\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b9\u30ec\u30c3\u30c9\u306e\u540c\u6642\u51e6\u7406\u306e\u5229\u70b9\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u547c\u3073\u51fa\u3057\u5143\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u5024\u3092\u8fd4\u3059\u3053\u3068\u3082\u53ef [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-740","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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