AWT » MouseListener 介面

MouseListener 介面

MouseEvent類的物件應該實現這個介面。元件註冊。使用addMouseListener（）方法，該物件可以被註冊。

介面宣告

以下是宣告的java.awt.event.MouseListener介面：

public interface MouseListener
   extends EventListener

介面中的方法

S.N. Method & Description
1 void mouseClicked(MouseEvent e) 
Invoked when the mouse button has been clicked (pressed and released) on a component.
2 void mouseEntered(MouseEvent e) 
Invoked when the mouse enters a component.
3 void mouseExited(MouseEvent e) 
Invoked when the mouse exits a component.
4 void mousePressed(MouseEvent e) 
Invoked when a mouse button has been pressed on a component.
5 void mouseReleased(MouseEvent e)
Invoked when a mouse button has been released on a component.

繼承的方法

這個介面繼承的方法從下面的介面：

  • java.awt.EventListener

MouseListener的範例

選擇使用任何編輯器建立以下java程式D:/ > AWT > com > yiibai > gui >

AwtListenerDemo 
package com.yiibai.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.showMouseListenerDemo();
   }

   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 showMouseListenerDemo(){
      headerLabel.setText("Listener in action: MouseListener");      

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

      Label msglabel = new Label();
      msglabel.setAlignment(Label.CENTER);
      msglabel.setText("Welcome to TutorialsPoint AWT Tutorial.");

      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) {
      }
   }
}

編譯程式，使用命令提示字元。到D:/ > AWT 然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtListenerDemo.java

如果沒有錯誤出現，這意味著編譯成功。使用下面的命令來執行程式。

D:AWT>java com.yiibai.gui.AwtListenerDemo

驗證下面的輸出

AWT MouseListener