WindowListener
用於接收窗口事件的偵聽器接口。旨在處理窗口事件的類要麼實現此接口(及其包含的所有方法),要麼擴展抽象類 WindowAdapter
(僅重寫所需的方法)。
windowClosing(WindowEvent e); //用戶試圖從窗口的系統菜單中關閉窗口關閉窗口
windowOpened(WindowEvent e); //窗口首次變爲可見是調用
windowActivated(WindowEvent e); //激活窗口
windowIconified(WindowEvent e); //窗口從正常狀態變爲最小化圖標
windowDeiconified(WindowEvent e); //窗口從最小化狀態變爲正常狀態時調用windowDeactivated(WindowEvent e); //窗口變爲非活動窗口
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class WindowTest01 implements WindowListener{
TextArea t=new TextArea(6,30);
public WindowTest01(){
Frame f=new Frame("WindowListener演示");
f.add(t, BorderLayout.CENTER);
//向窗口添加監聽事件
f.addWindowListener(this);
f.setSize(400,300);
f.setVisible(true);
}
public void windowOpened(WindowEvent e) {
// TODO Auto-generated method stub
t.append("窗口被打開\n");
}
public void windowClosing(WindowEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
public void windowClosed(WindowEvent e) {
// TODO Auto-generated method stub
t.append("用戶試圖從窗口的系統菜單中關閉窗口關閉窗口\n");
}
public void windowIconified(WindowEvent e) {
// TODO Auto-generated method stub
t.append("窗口從正常狀態變爲最小化圖標\n");
}
public void windowDeiconified(WindowEvent e) {
// TODO Auto-generated method stub
t.append("窗口從最小化狀態變爲正常狀態時調用\n");
}
public void windowActivated(WindowEvent e) {
// TODO Auto-generated method stub
t.append("激活窗口\n");
}
public void windowDeactivated(WindowEvent e) {
// TODO Auto-generated method stub
t.append("窗口變爲非活動窗口\n");
}
public static void main(String[] args){
new WindowTest01();
}
}
監聽實現一般步驟
1.確定事件源,繼承監聽事件的接口
2.註冊監聽事件addWindowListener(this);
3.處理事件