Java捕获窗口状态事件

package com.han;

import java.awt.Frame;
import java.awt.event.WindowEvent;
import java.awt.event.WindowStateListener;

import javax.swing.JFrame;

/**
 * 捕获窗口状态事件
 * @author HAN
 *
 */
public class WindowEvent_2 extends JFrame {

  /**
   * 
   */
  private static final long serialVersionUID = -2809729177140674307L;

  public WindowEvent_2() {
    // TODO Auto-generated constructor stub
    addWindowStateListener(new WindowStateListener() {

      @Override
      public void windowStateChanged(WindowEvent e) {
        // TODO Auto-generated method stub
        int oldState = e.getOldState();
        int newState = e.getNewState();
        String from = null;
        String to;
        switch (oldState) {
        case Frame.NORMAL:
          from = "正常化";
          break;
        case Frame.MAXIMIZED_BOTH:
          from = "最大化";
          break;
        case Frame.ICONIFIED:
          from = "图标化";
          break;
        }
        switch (newState) {
        case Frame.NORMAL:
          to = "正常化";
          break;
        case Frame.MAXIMIZED_BOTH:
          to = "最大化";
          break;
        default:
          to = "图标化";
          break;
        }
        System.out.println(from + "---->" + to);
      }

    });
  }

  /**
   * @param args
   */
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    WindowEvent_2 frame = new WindowEvent_2();
    frame.setTitle("捕获窗口状态事件");
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(0, 0, 300, 100);
  }

}