Java WindowListener 接口

2025年3月17日 | 阅读 3 分钟

Java WindowListener 在窗口状态更改时收到通知。它会针对 WindowEvent 收到通知。 WindowListener 接口位于 java.awt.event 包中。它有三个方法。

WindowListener 接口声明

java.awt.event.WindowListener 接口的声明如下所示

WindowListener 接口的方法

下面给出了 WindowListener 接口中的 7 个方法的签名及其用法

序号。	方法签名	描述
1.	public abstract void windowActivated (WindowEvent e);	当窗口设置为活动窗口时调用。
2.	public abstract void windowClosed (WindowEvent e);	当窗口因调用 dispose 而关闭时调用。
3.	public abstract 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.	public abstract void windowDeactivated (WindowEvent e);	当窗口不再是活动窗口时调用。
5.	public abstract void windowDeiconified (WindowEvent e);	当窗口从最小化状态更改为正常状态时调用。
6.	public abstract void windowIconified (WindowEvent e);	当窗口从正常状态更改为最小化状态时调用。
7.	public abstract void windowOpened (WindowEvent e);	首次使窗口可见时调用。

WindowListener 继承的方法

此接口从 EventListener 接口继承方法。

WindowListener 接口的工作原理

如果一个类需要处理一些窗口事件，则应该存在一个可以实现该接口的对象。
由于该对象已在 Listener 中注册，因此会在窗口的所有状态下生成事件。
这有助于生成对侦听器对象中相关方法的调用。然后在调用后传递 WindowEvent。

Java WindowListener 示例

在以下示例中，我们将逐个实现 WindowListener 接口的所有方法。

WindowExample.java

// importing necessary libraries of awt
import java.awt.*;  
import java.awt.event.WindowEvent;  
import java.awt.event.WindowListener; 

// class which inherits Frame class and implements WindowListener interface 
public class WindowExample extends Frame implements WindowListener {  

// class constructor
    WindowExample() { 

    // adding WindowListener to the frame 
        addWindowListener(this); 
        // setting the size, layout and visibility of frame      
        setSize (400, 400);  
        setLayout (null);  
        setVisible (true);  
    } 
// main method
public static void main(String[] args) {  
    new WindowExample();  
}  

// overriding windowActivated() method of WindowListener interface which prints the given string when window is set to be active
public void windowActivated (WindowEvent arg0) {  
    System.out.println("activated");  
}  

// overriding windowClosed() method of WindowListener interface which prints the given string when window is closed
public void windowClosed (WindowEvent arg0) {  
    System.out.println("closed");  
}  

// overriding windowClosing() method of WindowListener interface which prints the given string when we attempt to close window from system menu
public void windowClosing (WindowEvent arg0) {  
    System.out.println("closing");  
    dispose();  
}  

// overriding windowDeactivated() method of WindowListener interface which prints the given string when window is not active
public void windowDeactivated (WindowEvent arg0) {  
    System.out.println("deactivated");  
}  

// overriding windowDeiconified() method of WindowListener interface which prints the given string when window is modified from minimized to normal state
public void windowDeiconified (WindowEvent arg0) {  
    System.out.println("deiconified");  
}  

// overriding windowIconified() method of WindowListener interface which prints the given string when window is modified from normal to minimized state
public void windowIconified(WindowEvent arg0) {  
    System.out.println("iconified");  
}  

// overriding windowOpened() method of WindowListener interface which prints the given string when window is first opened
public void windowOpened(WindowEvent arg0) {  
    System.out.println("opened");  
}  
}  

输出

下一个主题Java 适配器类

Java WindowListener 接口

WindowListener 接口声明

WindowListener 接口的方法

WindowListener 继承的方法

WindowListener 接口的工作原理

Java WindowListener 示例

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WindowListener 接口的方法

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