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<TITLE>Determining When the Application Is About to Exit
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h3>
e50.
Determining When the Application Is About to Exit</h3>
When an application is terminated normally, the application first
starts any registered <font color="#0066ff"><i>shutdown threads</i></font>, waits for them to complete
and then finally exits. Normal termination can be caused by a call to
<code>System.exit()</code>, the completion of the last non-daemon thread, or the
interruption of the application (control-C) by the user. Abnormal
termination (which does not cause the shutdown threads to be started)
is caused some major fault in the Java virtual machine or native
library.
<pre>
// Register a shutdown thread
Runtime.getRuntime().addShutdownHook(new Thread() {
// This method is called during shutdown
public void run() {
// Do shutdown work ...
}
});
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Related Examples
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e48. <a class="eglink" href="BasicApp.html?l=rel">
The Quintessential Java Application
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e49. <a class="eglink" href="Exit.html?l=rel">
Terminating the Application
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e51. <a class="eglink" href="ElapsedTime.html?l=rel">
Computing Elapsed Time
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e52. <a class="eglink" href="LoadNative.html?l=rel">
Loading Native Code
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e53. <a class="eglink" href="Sortable.html?l=rel">
Implementing a Class That Can Be Sorted
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e54. <a class="eglink" href="Redirect.html?l=rel">
Redirecting Standard Output, and Error
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e55. <a class="eglink" href="GetHeapSize.html?l=rel">
Getting the Size of the Heap
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See also:
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Arrays">
Arrays
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Assertions">
Assertions
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Classes">
Classes
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Commands">
Commands
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Numbers">
Numbers
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Objects">
Objects
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Strings">
Strings
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#System%20Properties">
System Properties
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Threads">
Threads
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