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I have a Java swing launcher program to launch another class (running its main method). Each program has its cancel button to exit itself.
I use System.exit(0); when this cancel button is pressed.
The launcher program does this in actionPerformed:
if (source==carMenuItem) {
ta.append("Car launched\n");
TestCar.main(par);
}
if (source==DialogboxMenuItem) {
ta.append("Dialogbox launched\n");
DialogBox.main(par);
}
if (source==LengthConversionMenuItem) {
ta.append("LengthConversion launched\n");
LengthConversion.main(par);
}
When I press the program's cancel button, it also closes my launcher program. How can I avoid this situation?
433
Exit a Java Method using Return There is one more way to exit the java program using return keyword. return keyword completes execution of the method when used and returns the value from the function. The return keyword can be used to exit any method when it doesn't return any value.
exit() method exits current program by terminating running Java virtual machine. This method takes a status code. A non-zero value of status code is generally used to indicate abnormal termination.
The main alternative is Runtime. getRuntime(). halt(0) , described as "Forcibly terminates the currently running Java virtual machine". This does not call shutdown hooks or exit finalizers, it just exits.
System.exit() terminates the VM therefore your initial thread is terminated also, simply return from your main() method.
After reviewing you code: Not all classes are supposed to have a main() method (If not also used standalone). You should consider to call a constructor to create an instance of a class and call a method not named main().
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