Close application when click on JFrame close button (Java)

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COMPLETE SOURCE CODE FOR : ExitApplicationUsingJFrameCloseButton.java
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import javax.swing.JFrame;

public class ExitApplicationUsingJFrameCloseButton
{
 public static void main(String[]args)
 {
  JFrame a=new JFrame("EXIT AN APPLICATION USING JFRAME CLOSE BUTTON");
 
  //JFrame.EXIT_ON_CLOSE will make your application close when you hit JFrame close button
  a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  a.setSize(200,200);
  a.setVisible(true);
 }
}


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JUST COMPILE AND EXECUTE IT
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