windowlistenerframe2.java

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package listener;

import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class WindowListenerFrame2 extends JFrame {

  private static final long serialVersionUID = 1L;
  private JPanel jContentPane = null;

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        WindowListenerFrame2 thisClass = new WindowListenerFrame2();
        thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        thisClass.setVisible(true);
      }
    });
  }
  public WindowListenerFrame2() {
    super();
    initialize();
  }
  private void initialize() {
    this.setSize(300, 200);
    //应用WindowAdapter类引入窗口接收器
    this.addWindowListener(new java.awt.event.WindowAdapter() {
      public void windowClosing(java.awt.event.WindowEvent e) {
        System.out.println("窗口正在关闭。");
        //清空内存
        System.exit(0);
      }
    });
    this.setContentPane(getJContentPane());
    this.setTitle("窗口接收器示例");
  }
  private JPanel getJContentPane() {
    if (jContentPane == null) {
      jContentPane = new JPanel();
      jContentPane.setLayout(new BorderLayout());
    }
    return jContentPane;
  }
}