檢查鼠標是否在Java中被點擊

Question

我正在用Java寫一個GUI。我需要知道如何檢查用戶是否點擊鼠標。我知道如何檢查鼠標的位置，但我只需要檢查它是否被點擊。

import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
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import java.awt.*; 
import java.awt.event.*; 
import java.awt.image.*; 
import java.io.*; 

import javax.imageio.*; 
import javax.swing.*; 

/** 
* This class demonstrates how to load an Image from an external file 
*/ 
public class LoadImageApp extends Component { 

    BufferedImage img; 

    public void paint(Graphics g) { 
     g.drawImage(img, 50, 70, null); 
    } 

    public LoadImageApp() { 
     try { 
      img = ImageIO.read(new File("strawberry.jpg")); 
     } catch (IOException e) { 
     } 

    } 

    public Dimension getPreferredSize() { 
     if (img == null) { 
      return new Dimension(100,100); 
     } else { 
      return new Dimension(img.getWidth(null), img.getHeight(null)); 
     } 
    } 

    public static void main(String[] args) throws InterruptedException { 

     JFrame f = new JFrame("Load Image Sample"); 

     f.addWindowListener(new WindowAdapter(){ 
       public void windowClosing(WindowEvent e) { 
        System.exit(0); 
       } 
      }); 

     f.add(new LoadImageApp()); 
     f.pack(); 
     f.setVisible(true); 
     f.setResizable(true); 
     while(true){ 
      Thread.sleep(1000); 
      PointerInfo a = MouseInfo.getPointerInfo(); 
      Point b = a.getLocation(); 
      int x = (int) b.getX(); 
      int y = (int) b.getY(); 

      System.out.println(x); 
      System.out.println(y); 
     } 
     } 
    public void mouseClicked(MouseEvent e) { 
     System.out.println("mouseClicked"); 
     } 
} 

這是我所有的代碼，所以請解釋如何實現一個鼠標檢查器的東西。 謝謝！

Answer 1

執行MouseListener接口並將您的代碼放入mouseClicked(MouseEvent e)方法中。然後將此類的實例作爲偵聽器添加到您的組件中。

基本上，你創建一個這樣的類：

class myMouseListener implements MouseListener { 

@Override 
public void mouseClicked(MouseEvent arg0) { 
    //Put the code you want here 
    //... 
    //... 
} 

@Override 
public void mouseEntered(MouseEvent arg0) { } 

@Override 
public void mouseExited(MouseEvent arg0) { } 

@Override 
public void mousePressed(MouseEvent arg0) { 
} 

@Override 
public void mouseReleased(MouseEvent arg0) { 

} 

} 

然後你簡單的創建這個新類的新實例myMouseListener

myMouseListener mml = new myMouseListener(); 

而且你將它添加爲監聽到你的組件。喜歡的東西：

myPanel.addMouseListener(mml); 

所有的信息在這裏：http://docs.oracle.com/javase/7/docs/api/java/awt/event/MouseListener.html