WindowListener
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小牛编辑
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2023-12-01
处理WindowEvent的类应该实现此接口。该类的对象必须在组件中注册。 可以使用addWindowListener()方法注册该对象。
接口声明
以下是java.awt.event.WindowListener接口的声明:
public interface WindowListener
extends EventListener
接口方法 (Interface methods)
SN | 方法和描述 |
---|---|
1 | void windowActivated(WindowEvent e) 将Window设置为活动Window时调用。 |
2 | void windowClosed(WindowEvent e) 由于在窗口上调用dispose而关闭窗口时调用。 |
3 | void windowClosing(WindowEvent e) 当用户尝试从窗口的系统菜单关闭窗口时调用。 |
4 | void windowDeactivated(WindowEvent e) 当Window不再是活动Window时调用。 |
5 | void windowDeiconified(WindowEvent e) 窗口从最小化状态更改为正常状态时调用。 |
6 | void windowIconified(WindowEvent e) 当窗口从正常状态更改为最小化状态时调用。 |
7 | void windowOpened(WindowEvent e) 第一次使窗口可见时调用。 |
方法继承
此接口从以下接口继承方法:
java.awt.EventListener
WindowListener示例
使用您选择的任何编辑器创建以下java程序,例如D:/ 》 AWT 》 com 》 iowiki 》 gui 》
AwtListenerDemo.javapackage com.iowiki.gui;
import java.awt.*;
import java.awt.event.*;
public class AwtListenerDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
public AwtListenerDemo(){
prepareGUI();
}
public static void main(String[] args){
AwtListenerDemo awtListenerDemo = new AwtListenerDemo();
awtListenerDemo.showWindowListenerDemo();
}
private void prepareGUI(){
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showWindowListenerDemo(){
headerLabel.setText("Listener in action: WindowListener");
Button okButton = new Button("OK");
aboutFrame = new Frame();
aboutFrame.setSize(300,200);;
aboutFrame.setTitle("WindowListener Demo");
aboutFrame.addWindowListener(new CustomWindowListener());
Label msgLabel = new Label("Welcome to iowiki.");
msgLabel.setAlignment(Label.CENTER);
msgLabel.setSize(100,100);
aboutFrame.add(msgLabel);
aboutFrame.setVisible(true);
}
class CustomWindowListener implements WindowListener {
public void windowOpened(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
aboutFrame.dispose();
}
public void windowClosed(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowDeiconified(WindowEvent e) {
}
public void windowActivated(WindowEvent e) {
}
public void windowDeactivated(WindowEvent e) {
}
}
}
使用命令提示符编译程序。 转到D:/ 》 AWT并键入以下命令。
D:\AWT>javac com\iowiki\gui\AwtListenerDemo.java
如果没有错误,那意味着编译成功。 使用以下命令运行程序。
D:\AWT>java com.iowiki.gui.AwtListenerDemo
验证以下输出