141 lines
5.5 KiB
HTML
141 lines
5.5 KiB
HTML
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<meta name="DC.Title" content="Example: Wait for threads using Java" />
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<meta name="abstract" content="This example shows a Java program starting several threads, waiting for them to finish, and checking their status after completion." />
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<meta name="description" content="This example shows a Java program starting several threads, waiting for them to finish, and checking their status after completion." />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Wait for threads using Java</title>
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<body id="rzahwex3-ex3rx"><a name="rzahwex3-ex3rx"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Wait for threads using Java</h1>
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<div><p>This example shows a Java™ program starting several threads, waiting
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for them to finish, and checking their status after completion.</p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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</div>
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<div class="example"> <pre>/*
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FileName: ATEST15.java
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The output of this example is as follows:
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Entered the testcase
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Create some worker threads
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Start the thread
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Thread Thread-1: Entered
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Thread Thread-1: Working
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Thread Thread-2: Entered
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Thread Thread-2: Working
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Thread Thread-3: Entered
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Thread Thread-3: Working
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Thread Thread-4: Entered
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Thread Thread-4: Working
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Wait for worker threads to complete
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Thread Thread-5: Entered
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Thread Thread-5: Working
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Thread Thread-1: Done with work
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Thread Thread-2: Done with work
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Thread Thread-3: Done with work
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Thread Thread-4: Done with work
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Thread Thread-5: Done with work
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Check all thread's results
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Testcase completed
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*/
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import java.lang.*;
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public class ATEST15 {
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public final static int THREADGROUPSIZE = 5;
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static class theThread extends Thread {
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public final static int THREADPASS = 0;
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public final static int THREADFAIL = 1;
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int _status;
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public int status() {
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return _status;
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}
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public theThread() {
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_status = THREADFAIL;
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}
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public void run() {
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System.out.print("Thread " + getName() + ": Entered\n");
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System.out.print("Thread " + getName() + ": Working\n");
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safeSleep(15000, "Thread " + getName() + " work");
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System.out.print("Thread " + getName() + ": Done with work\n");
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_status = THREADPASS;
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}
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}
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public static void main(String argv[]) {
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int i=0;
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theThread thread[] = new theThread[THREADGROUPSIZE];
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System.out.print("Entered the testcase\n");
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System.out.print("Create some worker threads\n");
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System.out.print("Start the thread\n");
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/* We won't use a ThreadGroup for this example, because we'd */
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/* still have to join all the threads individually */
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for (i=0; i <THREADGROUPSIZE; ++i) {
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thread[i] = new theThread();
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thread[i].start();
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}
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System.out.print("Wait for worker threads to complete\n");
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for (i=0; i <THREADGROUPSIZE; ++i) {
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try {
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thread[i].join();
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}
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catch (InterruptedException e) {
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System.out.print("Join interrupted\n");
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}
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}
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System.out.print("Check all thread's results\n");
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for (i=0; i <THREADGROUPSIZE; ++1) {
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if (thread[i].status() != theThread.THREADPASS) {
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System.out.print("Unexpected thread status\n");
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}
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}
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System.out.print("Testcase completed\n");
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System.exit(0);
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}
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public static void safeSleep(long milliseconds, String s) {
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try {
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Thread.sleep(milliseconds);
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}
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catch (InterruptedException e) {
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System.out.print(s);
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}
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}
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}
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</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahwwatco.htm" title="When using threads, it is important to know when a thread has finished processing. Waiting for a thread to perform an action or an event to happen is called thread synchronization.">Wait for a thread to end</a></div>
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</div>
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</div>
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</body>
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