Determining When the Application Is About to Exit
When an application is terminated normally, the application first
starts any registered shutdown threads, waits for them to complete
and then finally exits. Normal termination can be caused by a call to
System.exit(), 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.
// 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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