How to quit a java app from within the program

Question

What s the best way to quit a Java application with code

User · Answer

System exit   is usually not the best way  but it depends on your application   The usual way of ending an application is by exiting the main   method  This does not work when there are other non-deamon threads running  as is usual for applications with a graphical user interface  AWT  Swing etc    For these applications  you either find a way to end the GUI event loop  don t know if that is possible with the AWT or Swing   or invoke System exit

User · Answer

System exit 0     The  0  lets whomever called your program know that everything went OK  If  however  you are quitting due to an error  you should System exit 1    or with another non-zero number corresponding to the specific error   Also  as others have mentioned  clean up first  That involves closing files and other open resources

User · Answer

There s two simple answers to the question   This is the  Professional way      This just terminates the program  System exit 0     This is a more clumsier way     This just terminates the program  just like System exit 0   return

User · Answer

I agree with Jon  have your application react to something and call System exit      Be sure that    you use the appropriate exit value  0 is normal exit  anything else indicates there was an error you close all input and output streams  Files  network connections  etc  you log or print a reason for exiting especially if its because of an error

User · Answer

Runtime getCurrentRumtime   halt 0

User · Answer

System exit ABORT   Quit s the process immediately

User · Answer

System exit   will do what you want  But in most situations  you probably want to exit a thread  and leave the main thread alive  By doing that  you can terminate a task  but also keep the ability to start another task without restarting the app

User · Answer

Using dispose    is a very effective way for closing your programs   I found that using System exit x  resets the interactions pane and supposing you need some of the information there it all disappears

User · Answer

This should do it in the correct way   mainFrame setDefaultCloseOperation JFrame DO NOTHING ON CLOSE   mainFrame addWindowListener new WindowListener       Override public void windowClosing WindowEvent e        if  doQuestion  Really want to exit             mainFrame setDefaultCloseOperation JFrame EXIT ON CLOSE         mainFrame dispose

User · Answer

System exit int i  is to be used  but I would include it inside a more generic shutdown   method  where you would include  cleanup  steps as well  closing socket connections  file descriptors  then exiting with System exit x

User · Answer

You can use System exit   for this purpose  According to oracle s Java 8 documentation   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

The answer is System exit    but not a good thing to do as this aborts the program  Any cleaning up  destroy that you intend to do will not happen

[java] How to quit a java app from within the program

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