{"id":815,"date":"2022-10-21T01:37:55","date_gmt":"2023-04-29T17:50:38","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aecallable-future%e3%81%ae%e4%be%8b\/"},"modified":"2025-08-01T02:42:09","modified_gmt":"2025-07-31T17:42:09","slug":"java%e3%81%aecallable-future%e3%81%ae%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aecallable-future%e3%81%ae%e4%be%8b\/","title":{"rendered":"Java\u306eCallable Future\u306e\u4f8b"},"content":{"rendered":"

Java\u306eCallable\u3068Future\u306f\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u904e\u53bb\u306e\u3044\u304f\u3064\u304b\u306e\u8a18\u4e8b\u3067\u3001\u79c1\u305f\u3061\u306fJava\u306e\u30b9\u30ec\u30c3\u30c9\u306b\u3064\u3044\u3066\u591a\u304f\u306e\u3053\u3068\u3092\u5b66\u3073\u307e\u3057\u305f\u304c\u3001\u6642\u306b\u306f\u30b9\u30ec\u30c3\u30c9\u304c\u5024\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u4fbf\u5229\u3067\u3059\u3002Java 5\u3067\u306f\u3001\u4e26\u884c\u6027\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e2d\u306bjava.util.concurrent.Callable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306fRunnable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u3069\u3093\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u3001\u4f8b\u5916\u3092\u6295\u3052\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n

Java\u306eCallable<\/h2>\n

Java\u306eCallable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u623b\u308a\u5024\u306e\u578b\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u3067\u5b9a\u7fa9\u3057\u307e\u3059\u3002Executors\u30af\u30e9\u30b9\u306f\u3001Java\u306eCallable\u3092\u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u3067\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002Callable\u30bf\u30b9\u30af\u306f\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b\u305f\u3081\u3001\u8fd4\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5f85\u3064\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

Java\u306e\u672a\u6765<\/h2>\n

Java\u306eCallable\u30bf\u30b9\u30af\u306f\u3001java.util.concurrent.Future\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002Java\u306eFuture\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001Callable\u30bf\u30b9\u30af\u306e\u72b6\u614b\u3092\u78ba\u8a8d\u3057\u3001\u8fd4\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Callable\u304c\u7d42\u4e86\u3059\u308b\u306e\u3092\u5f85\u3063\u3066\u7d50\u679c\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308bget()\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java\u306eFuture\u306f\u3001\u95a2\u9023\u3059\u308bCallable\u30bf\u30b9\u30af\u3092\u30ad\u30e3\u30f3\u30bb\u30eb\u3059\u308b\u305f\u3081\u306ecancel()\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u7d50\u679c\u3092\u5f85\u3064\u305f\u3081\u306e\u6642\u9593\u3092\u6307\u5b9a\u3067\u304d\u308bget()\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u30d0\u30fc\u30b8\u30e7\u30f3\u3082\u3042\u308a\u3001\u73fe\u5728\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u9577\u6642\u9593\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u306e\u3092\u907f\u3051\u308b\u306e\u306b\u4fbf\u5229\u3067\u3059\u3002\u95a2\u9023\u3059\u308bCallable\u30bf\u30b9\u30af\u306e\u73fe\u5728\u306e\u72b6\u614b\u3092\u8abf\u3079\u308b\u305f\u3081\u306eisDone()\u30e1\u30bd\u30c3\u30c9\u3068isCancelled()\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u30011\u79d2\u5f8c\u306b\u30bf\u30b9\u30af\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u30b9\u30ec\u30c3\u30c9\u306e\u540d\u524d\u3092\u8fd4\u3059Java\u306eCallable\u30bf\u30b9\u30af\u306e\u7c21\u5358\u306a\u4f8b\u3067\u3059\u3002Executor\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u7528\u3057\u3066100\u306e\u30bf\u30b9\u30af\u3092\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3057\u3001\u9001\u4fe1\u3055\u308c\u305f\u30bf\u30b9\u30af\u306e\u7d50\u679c\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306bJava Future\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

package com.scdev.threads;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Date;\r\nimport java.util.List;\r\nimport java.util.concurrent.Callable;\r\nimport java.util.concurrent.ExecutionException;\r\nimport java.util.concurrent.ExecutorService;\r\nimport java.util.concurrent.Executors;\r\nimport java.util.concurrent.Future;\r\n\r\npublic class MyCallable implements Callable<String> {\r\n\r\n    @Override\r\n    public String call() throws Exception {\r\n        Thread.sleep(1000);\r\n        \/\/return the thread name executing this callable task\r\n        return Thread.currentThread().getName();\r\n    }\r\n    \r\n    public static void main(String args[]){\r\n        \/\/Get ExecutorService from Executors utility class, thread pool size is 10\r\n        ExecutorService executor = Executors.newFixedThreadPool(10);\r\n        \/\/create a list to hold the Future object associated with Callable\r\n        List<Future<String>> list = new ArrayList<Future<String>>();\r\n        \/\/Create MyCallable instance\r\n        Callable<String> callable = new MyCallable();\r\n        for(int i=0; i< 100; i++){\r\n            \/\/submit Callable tasks to be executed by thread pool\r\n            Future<String> future = executor.submit(callable);\r\n            \/\/add Future to the list, we can get return value using Future\r\n            list.add(future);\r\n        }\r\n        for(Future<String> fut : list){\r\n            try {\r\n                \/\/print the return value of Future, notice the output delay in console\r\n                \/\/ because Future.get() waits for task to get completed\r\n                System.out.println(new Date()+ \"::\"+fut.get());\r\n            } catch (InterruptedException | ExecutionException e) {\r\n                e.printStackTrace();\r\n            }\r\n        }\r\n        \/\/shut down the executor service now\r\n        executor.shutdown();\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001java\u306eFuture get\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u304cjava\u306ecallable\u30bf\u30b9\u30af\u306e\u5b8c\u4e86\u3092\u5f85\u3064\u305f\u3081\u3001\u51fa\u529b\u306b\u9045\u5ef6\u304c\u3042\u308b\u3053\u3068\u306b\u6c17\u4ed8\u304f\u3067\u3057\u3087\u3046\u3002\u307e\u305f\u3001\u3053\u308c\u3089\u306e\u30bf\u30b9\u30af\u3092\u5b9f\u884c\u3059\u308b\u30b9\u30ec\u30c3\u30c9\u306f10\u500b\u3057\u304b\u306a\u3044\u3053\u3068\u306b\u3082\u6c17\u4ed8\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u4ee5\u4e0b\u306f\u3001\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e00\u90e8\u306e\u51fa\u529b\u306e\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u3059\u3002<\/p>\n
Mon Dec 31 20:40:15 PST 2012::pool-1-thread-1\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-2\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-3\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-4\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-5\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-6\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-7\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-8\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-9\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-10\r\nMon Dec 31 20:40:16 PST 2012::pool-1-thread-2\r\n...\r\n<\/code><\/pre>\n
\u30d2\u30f3\u30c8\uff1aJava Future\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\u3001\u4f8b\u3048\u3070get()\u30e1\u30bd\u30c3\u30c9\u3092\u7121\u671f\u9650\u5f85\u6a5f\u3059\u308b\u4ee3\u308f\u308a\u306b\u4e00\u5b9a\u6642\u9593\u5f8c\u306b\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3055\u305b\u305f\u3044\u5834\u5408\u3001Java\u306eFutureTask\u30af\u30e9\u30b9\u304c\u4fbf\u5229\u3067\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u3001Future\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c\u7684\u306a\u5b9f\u88c5\u3067\u3059\u3002Java FutureTask\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3001\u3053\u306e\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3055\u3089\u306b\u5b66\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u306eCallable\u3068Future\u306f\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u904e\u53bb\u306e\u3044\u304f\u3064\u304b\u306e\u8a18\u4e8b\u3067\u3001\u79c1\u305f\u3061\u306fJava\u306e\u30b9\u30ec\u30c3\u30c9\u306b\u3064\u3044\u3066\u591a\u304f\u306e\u3053\u3068\u3092\u5b66\u3073\u307e\u3057\u305f\u304c\u3001\u6642\u306b\u306f\u30b9\u30ec\u30c3\u30c9\u304c\u5024\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u4fbf\u5229\u3067 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-815","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u306eCallable Future\u306e\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u306eCallable Future\u306e\u4f8b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306ecallable-future\u306e\u4f8b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306eCallable Future\u306e\u4f8b\" \/>\n<meta property=\"og:description\" content=\"Java\u306eCallable Future\u306e\u4f8b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306ecallable-future\u306e\u4f8b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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