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Java Swing - 如何当点击外面时关闭JFrame

jframe 【jframe】
我们想知道如何当点击外面时关闭JFrame。
代码展示 运行结果 
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);
  }
}