{"id":12421,"date":"2024-03-14T15:49:36","date_gmt":"2024-03-14T15:49:36","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-process-waitfor-method-used-in-java\/"},"modified":"2025-08-05T01:20:27","modified_gmt":"2025-08-05T01:20:27","slug":"how-is-the-process-waitfor-method-used-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-process-waitfor-method-used-in-java\/","title":{"rendered":"Java Process.waitFor() Method Explained"},"content":{"rendered":"<p>In Java, the Process.waitFor() method is used to wait for the associated child process to terminate and return the exit value of the child process. In other words, it suspends the current thread until the child process is finished.<\/p>\n<p>This method returns an integer value that indicates the exit status of the child process. It returns a value of 0 if the child process terminates normally, and a non-zero value if the child process terminates abnormally.<\/p>\n<p>The Process.waitFor() method is commonly used together with the Process.exitValue() method, which is used to retrieve the exit value of the child process. For example, you can use the waitFor() and exitValue() methods in the following way:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">Process<\/span> <span class=\"hljs-variable\">process<\/span> <span class=\"hljs-operator\">=<\/span> Runtime.getRuntime().exec(<span class=\"hljs-string\">\"some_command\"<\/span>);\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">exitValue<\/span> <span class=\"hljs-operator\">=<\/span> process.waitFor();\r\nSystem.out.println(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u503c\u4e3a\uff1a\"<\/span> + exitValue);\r\n<\/code><\/pre>\n<p>In the code above, Runtime.getRuntime().exec(&#8220;some_command&#8221;) will create a new process to execute the given command. Then, the waitFor() method will wait for the child process to finish execution and return the exit value. Finally, the exit value will be printed out.<\/p>\n<p>It is important to note that the waitFor() method will cause the current thread to block until the child process is finished. If you do not want the current thread to be blocked, you can create a process using the ProcessBuilder class and start it with the start() method. Then, you can use Process.waitFor() method to wait for the child process to finish. This way, the current thread&#8217;s execution will not be blocked.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Java, the Process.waitFor() method is used to wait for the associated child process to terminate and return the exit value of the child process. In other words, it suspends the current thread until the child process is finished. This method returns an integer value that indicates the exit status of the child process. It [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[16281,16263,16245,3575,16280],"class_list":["post-12421","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-child-process","tag-exit-value","tag-java-process","tag-java-threading","tag-waitfor"],"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>Java Process.waitFor() Method Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how Java Process.waitFor() method works, waits for child processes, and handles exit values with examples.\" \/>\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-is-the-process-waitfor-method-used-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java Process.waitFor() Method Explained\" \/>\n<meta property=\"og:description\" content=\"Learn how Java Process.waitFor() method works, waits for child processes, and handles exit values with examples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-is-the-process-waitfor-method-used-in-java\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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