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    copied!<p>In the source code of <a href="http://www.docjar.com/html/api/java/lang/Thread.java.html" rel="nofollow">java.lang.Thread</a>, for the <code>interrupt</code> method the documentation clearly says:</p> <blockquote> <p>Interrupting a thread that is not alive need not have any effect.</p> </blockquote> <pre><code> 888 /** 889 * Interrupts this thread. 890 * 891 * &lt;p&gt; Unless the current thread is interrupting itself, which is 892 * always permitted, the {@link #checkAccess() checkAccess} method 893 * of this thread is invoked, which may cause a {@link 894 * SecurityException} to be thrown. 895 * 896 * &lt;p&gt; If this thread is blocked in an invocation of the {@link 897 * Object#wait() wait()}, {@link Object#wait(long) wait(long)}, or {@link 898 * Object#wait(long, int) wait(long, int)} methods of the {@link Object} 899 * class, or of the {@link #join()}, {@link #join(long)}, {@link 900 * #join(long, int)}, {@link #sleep(long)}, or {@link #sleep(long, int)}, 901 * methods of this class, then its interrupt status will be cleared and it 902 * will receive an {@link InterruptedException}. 903 * 904 * &lt;p&gt; If this thread is blocked in an I/O operation upon an {@link 905 * java.nio.channels.InterruptibleChannel &lt;/code&gt;interruptible 906 * channel&lt;code&gt;} then the channel will be closed, the thread's interrupt 907 * status will be set, and the thread will receive a {@link 908 * java.nio.channels.ClosedByInterruptException}. 909 * 910 * &lt;p&gt; If this thread is blocked in a {@link java.nio.channels.Selector} 911 * then the thread's interrupt status will be set and it will return 912 * immediately from the selection operation, possibly with a non-zero 913 * value, just as if the selector's {@link 914 * java.nio.channels.Selector#wakeup wakeup} method were invoked. 915 * 916 * &lt;p&gt; If none of the previous conditions hold then this thread's interrupt 917 * status will be set. &lt;/p&gt; 918 * 919 * &lt;p&gt; Interrupting a thread that is not alive need not have any effect. 920 * 921 * @throws SecurityException 922 * if the current thread cannot modify this thread 923 * 924 * @revised 6.0 925 * @spec JSR-51 926 */ 927 public void interrupt() { 928 if (this != Thread.currentThread()) 929 checkAccess(); 930 931 synchronized (blockerLock) { 932 Interruptible b = blocker; 933 if (b != null) { 934 interrupt0(); // Just to set the interrupt flag 935 b.interrupt(this); 936 return; 937 } 938 } 939 interrupt0(); 940 } </code></pre>
 

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