java 窗体事件 WindowListener

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;


public class WindowEventDemo extends JFrame implements WindowListener{

 

 @Override

 public void windowOpened(WindowEvent e) {

 //窗口首次打开时调用

 t.setBackground(Color.RED);//this.setBackground(Color.RED);没有效果 不知为啥？？？

 }


 @Override

 public void windowClosing(WindowEvent e) {

 //从系统菜单中关闭窗体时调用

 

 System.out.println("窗口关闭了");

 System.exit(-1);

 }


 @Override

 public void windowClosed(WindowEvent e) {

 //关闭窗体时调用  API: 因对窗口调用 dispose 而将其关闭时调用。

//
 System.exit(-1);放在这里不能完全关闭程序   红点还是亮的

 }


 @Override

 public void windowIconified(WindowEvent e) {

 //窗体变为最小化时调用

 }


 @Override

 public void windowDeiconified(WindowEvent e) {

 //窗体变为正常状态事调用

 }



 @Override

 public void windowActivated(WindowEvent e) {

 //窗体被激活时调用

 

 }


 @Override

 public void windowDeactivated(WindowEvent e) {

 // 当 Window 不再是活动 Window 时调用。

 }

 //WindowAdaptor类中的

/*
 public void windowDeactivated(WindowEvent e) {

 // 当 Window 不再是活动 Window 时调用。

 }


 

 public void windowStateChanged(WindowEvent e) {

 //当窗口状态改变时调用。

 }


 

 public void windowGainedFocus(WindowEvent e) {

 //窗口获得焦点时调用

 

 }

 

 public void windowLostFocus(WindowEvent e) {

 //窗口失去焦点时调用

 }*/


 

 JTextField t=new JTextField("内容");

 public void initUI() {

 JLabel title=new JLabel("窗体事件",JTextField.CENTER);//也行

 add(title,BorderLayout.NORTH);

 add(t,BorderLayout.CENTER);

 

 addWindowListener(this);

 setSize(500, 300);

 setLocationRelativeTo(null);//居中显示

 setVisible(true);

 setResizable(false);//禁止最大化

//
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 

 }


 public static void main(String[] args) {

 WindowEventDemo t=new WindowEventDemo();

 t.initUI();

 }

}