SWING - 鼠标监听器界面

要处理 MouseEvent 的类应实现此界面。该类的对象必定已在组件中注册。可以使用 **addMouseListener()** 方法注册该对象。

界面声明

以下是 **java.awt.event.MouseListener** 声明 −

public interface MouseListener
   extends EventListener

界面方法

继承的方法

此界面继承了以下界面的方法 −

• java.awt.EventListener

MouseListener 范例

在您选择的任何编辑器中（比如 **D:/ > SWING > com > tutorialspoint > gui >**）中创建以下 Java 程序。

SwingListenerDemo.java

package com.tutorialspoint.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingListenerDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingListenerDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingListenerDemo  swingListenerDemo = new SwingListenerDemo();  
      swingListenerDemo.showMouseListenerDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showMouseListenerDemo(){
      headerLabel.setText("Listener in action: MouseListener");      

      JPanel panel = new JPanel();      
      panel.setBackground(Color.magenta);
      panel.setLayout(new FlowLayout());        
      panel.addMouseListener(new CustomMouseListener());

      JLabel msglabel = 
      new JLabel("Welcome to TutorialsPoint SWING Tutorial.",JLabel.CENTER);        
      panel.add(msglabel);

      msglabel.addMouseListener(new CustomMouseListener());
      panel.add(msglabel);

      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
   class CustomMouseListener implements MouseListener {
      public void mouseClicked(MouseEvent e) {
         statusLabel.setText("Mouse Clicked: ("+e.getX()+", "+e.getY() +")");
      }
      public void mousePressed(MouseEvent e) {
      }
      public void mouseReleased(MouseEvent e) {
      }
      public void mouseEntered(MouseEvent e) {
      }
      public void mouseExited(MouseEvent e) {
      }
   }
}

使用命令提示符编译程序。转至 **D:/ > SWING**，然后键入以下命令。

D:\SWING>javac com\tutorialspoint\gui\SwingListenerDemo.java

如果没有出现错误，表示已成功编译。使用以下命令运行此程序。

D:\SWING>java com.tutorialspoint.gui.SwingListenerDemo

验证以下输出。