Java Swing How to - Close JFrame when clicking outside

Question

We would like to know how to close JFrame when clicking outside.
Answer

/* w  w  w  .  java  2  s.  c om*/
import java.awt.BorderLayout;
import java.awt.KeyboardFocusManager;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class Main {
  public static void main(String[] args) {
    final JFrame frame = new JFrame("Test");

    KeyboardFocusManager.getCurrentKeyboardFocusManager()
        .addVetoableChangeListener("focusedWindow",
            new VetoableChangeListener() {
              private boolean gained = false;

              @Override
              public void vetoableChange(PropertyChangeEvent evt)
                  throws PropertyVetoException {
                if (evt.getNewValue() == frame) {
                  gained = true;
                }
                if (gained && evt.getNewValue() != frame) {
                  frame.dispose();
                }
              }
            });

    frame.add(new JTextField(10), BorderLayout.NORTH);
    frame.add(new JTextField(10), BorderLayout.SOUTH);

    frame.pack();
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}