JFrame dispose vs System exit

Question

What is the difference between these two methods - System exit   and JFrame dispose     If we want to close a Java Swing application when a button is clicked  which method should I use

User · Answer

If you have multiple windows open and only want to close the one that was closed use JFrame dispose     If you want to close all windows and terminate the application use System exit

User · Answer

In addition to the above you can use the System exit   to return an exit code which may be very usuefull specially if your calling the process automatically using the System exit code   this can help you determine for example if an error has occured during the run

User · Answer

JFrame dispose    public void dispose     Releases all of the native screen resources used by this Window  its subcomponents  and all of its owned children  That is  the resources for these Components will be destroyed  any memory they consume will be returned to the OS  and they will be marked as undisplayable  The Window and its subcomponents can be made displayable again by rebuilding the native resources with a subsequent call to pack or show  The states of the recreated Window and its subcomponents will be identical to the states of these objects at the point where the Window was disposed  not accounting for additional modifications between those actions    Note  When the last displayable window within the Java virtual machine  VM  is disposed of  the VM may terminate  See AWT Threading Issues for more information   System exit    public static void exit int status    Terminates the currently running Java Virtual Machine  The argument serves as a status code  by convention  a nonzero status code indicates abnormal termination  This method calls the exit method in class Runtime  This method never returns normally   The call System exit n  is effectively equivalent to the call   Runtime getRuntime   exit n

User · Answer

JFrame dispose   affects only to this frame  release all of the native screen resources used by this component  its subcomponents  and all children   System exit   affects to entire JVM  If you want to close all JFrame or all Window  since Frames extend Windows  to terminate the application in an ordered mode  you can do some like this  Arrays asList Window getWindows    forEach e - gt  e dispose        or JFrame getFrames

User · Answer

System exit    causes the Java VM to terminate completely   JFrame dispose    causes the JFrame window to be destroyed and cleaned up by the operating system  According to the documentation  this can cause the Java VM to terminate if there are no other Windows available  but this should really just be seen as a side effect rather than the norm   The one you choose really depends on your situation  If you want to terminate everything in the current Java VM  you should use System exit   and everything will be cleaned up  If you only want to destroy the current window  with the side effect that it will close the Java VM if this is the only window  then use JFrame dispose

[java] JFrame.dispose() vs System.exit()

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