{"id":2309,"date":"2024-03-12T09:34:18","date_gmt":"2024-03-12T09:34:18","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/"},"modified":"2024-04-23T15:18:25","modified_gmt":"2024-04-23T15:18:25","slug":"how-to-retrieve-the-return-value-in-asynchronous-java-thread","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/","title":{"rendered":"How to retrieve the return value in asynchronous Java thread?"},"content":{"rendered":"<p>There are several common methods for asynchronous threads to retrieve return values in <a href=\"https:\/\/www.java.com\/\">Java<\/a>.<\/p>\n<ol>\n<li>By using the Future interface, you can obtain the return value of an asynchronous thread by using the get() method provided by the Future interface and the FutureTask class.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">ExecutorService<\/span> <span class=\"hljs-variable\">executor<\/span> <span class=\"hljs-operator\">=<\/span> Executors.newFixedThreadPool(<span class=\"hljs-number\">1<\/span>);\r\nFuture&lt;Integer&gt; future = executor.submit(() -&gt; {\r\n    <span class=\"hljs-comment\">\/\/ \u5f02\u6b65\u4efb\u52a1<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n});\r\n\r\n<span class=\"hljs-keyword\">try<\/span> {\r\n    <span class=\"hljs-type\">Integer<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> future.get();\r\n    System.out.println(<span class=\"hljs-string\">\"\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u4e3a\uff1a\"<\/span> + result);\r\n} <span class=\"hljs-keyword\">catch<\/span> (InterruptedException | ExecutionException e) {\r\n    e.printStackTrace();\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>By using the CompletableFuture class, which is an implementation of the Future in Java 8, you can handle the return values of asynchronous tasks.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>CompletableFuture&lt;Integer&gt; future = CompletableFuture.supplyAsync(() -&gt; {\r\n    <span class=\"hljs-comment\">\/\/ \u5f02\u6b65\u4efb\u52a1<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n});\r\n\r\nfuture.thenAccept(result -&gt; {\r\n    System.out.println(<span class=\"hljs-string\">\"\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u4e3a\uff1a\"<\/span> + result);\r\n});\r\n<\/code><\/pre>\n<ol>\n<li>Using a callback function allows you to retrieve the return value after the asynchronous task has been completed.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">ExecutorService<\/span> <span class=\"hljs-variable\">executor<\/span> <span class=\"hljs-operator\">=<\/span> Executors.newFixedThreadPool(<span class=\"hljs-number\">1<\/span>);\r\nexecutor.submit(() -&gt; {\r\n    <span class=\"hljs-comment\">\/\/ \u5f02\u6b65\u4efb\u52a1<\/span>\r\n    <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    \r\n    <span class=\"hljs-comment\">\/\/ \u8c03\u7528\u56de\u8c03\u51fd\u6570\u5904\u7406\u8fd4\u56de\u503c<\/span>\r\n    callbackFunction(result);\r\n});\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">callbackFunction<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> result)<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u4e3a\uff1a\"<\/span> + result);\r\n}\r\n<\/code><\/pre>\n<p>These are some commonly used methods in Java for retrieving return values from asynchronous threads. Depending on the specific situation, you can choose the method that suits you best.<\/p>\n<p>&nbsp;<\/p>\n<p>More tutorials<\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/the-spring-async-annotation-enables-asynchronous-processing\/\" target=\"_blank\" rel=\"noopener\">The Spring @Async Annotation enables asynchronous processing.<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-to-recover-java-asynchronous-thread-pool\/\" target=\"_blank\" rel=\"noopener\">What is the method to recover Java asynchronous thread pool?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/what-is-the-future-direction-of-development-for-the-cacti-system\/\" target=\"_blank\" rel=\"noopener\">What is the future direction of development for the Cacti system?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-automatically-close-a-java-thread-when-it-times-out\/\" target=\"_blank\" rel=\"noopener\">How to automatically close a Java thread when it times out?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/what-are-the-methods-for-handling-timeouts-in-java\/\" target=\"_blank\" rel=\"noopener\">What are the methods for handling timeouts in Java?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are several common methods for asynchronous threads to retrieve return values in Java. By using the Future interface, you can obtain the return value of an asynchronous thread by using the get() method provided by the Future interface and the FutureTask class. ExecutorService executor = Executors.newFixedThreadPool(1); Future&lt;Integer&gt; future = executor.submit(() -&gt; { \/\/ \u5f02\u6b65\u4efb\u52a1 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2309","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to retrieve the return value in asynchronous Java thread? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"There are several common methods for asynchronous threads to retrieve return values in Java.By using the Future interface\" \/>\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\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to retrieve the return value in asynchronous Java thread?\" \/>\n<meta property=\"og:description\" content=\"There are several common methods for asynchronous threads to retrieve return values in Java.By using the Future interface\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-12T09:34:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-23T15:18:25+00:00\" \/>\n<meta name=\"author\" content=\"Sophia Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sophia Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\"},\"author\":{\"name\":\"Sophia Anderson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/19a24313de9c988db3d69226b4a40a30\"},\"headline\":\"How to retrieve the return value in asynchronous Java thread?\",\"datePublished\":\"2024-03-12T09:34:18+00:00\",\"dateModified\":\"2024-04-23T15:18:25+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\"},\"wordCount\":204,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-the-return-value-in-asynchronous-java-thread\/\",\"name\":\"How to retrieve the return value in asynchronous Java thread? 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