Action Listener检测单个事件的多个事件

Question

我设计了一个包含一些按钮的面板。按钮附带一个ActionListener。当我点击那个按钮时，这个ActionListener检测到这个单击的4个事件。而它应该只检测一个。有人知道究竟是什么原因吗？

public class Buttons extends JPanel 
{ 
private JButton undo=new JButton("Undo"); 
private JButton replay=new JButton("Replay"); 

public void paint(Graphics g) 
{ 
    super.paint(g); 
    super.setSize(new Dimension(560,30)); 
    super.add(replay); 
    super.add(undo); 
    undo.setBorder(new LineBorder(Color.WHITE,3)); 
    replay.setBorder(new LineBorder(Color.WHITE,3)); 

    undo.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent arg0) { 
      // TODO Auto-generated method stub 
      Controler.pieces.undo(); 
      Controler.reDraw(); 

     } 
    }); 
    replay.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent arg0) { 
      // TODO Auto-generated method stub 
      System.out.println("Dastiii"); 
     } 
    }); 

} 
} 

而这些事件正在这里使用

public void undo() 
{ 
    System.out.print(Controler.allMoves.size()); 
    if(Controler.allMoves.size()<=1) 
    { 
     init_board(); 
     return; 
    } 
    Piece temp[][]=Controler.allMoves.get(Controler.allMoves.size()-2); 
    for(int i=0;i<8;i++) 
    { 
     for(int j=0;j<8;j++) 
     { 
      board[i][j].set_name(temp[i][j].get_name()); 
      board[i][j].set_oneWay(temp[i][j].get_oneWay()); 
     } 
    } 
    Controler.allMoves.remove(Controler.allMoves.size()-2); 
} 

Answer 1

您注册您的paint方法中ActionListener小号！

让我们即使不用担心的事实，这是联合国推荐的覆盖paint

不要改变或修改组件或任何它的国家在任何paint方法中的子组件，这些将被调用多次在执行你的应用程序期间。例如，它的不寻常的只是当是可见的主窗口被称为2-4次paint方法...

public void paint(Graphics g) 
{ 
    super.paint(g); 
    /** All this should be done within the constructor 
    // If you are using a layout manager, this is pointless, if your not 
    // then that's another problem 
    super.setSize(new Dimension(560,30)); 
    super.add(replay); 
    super.add(undo); 
    undo.setBorder(new LineBorder(Color.WHITE,3)); 
    replay.setBorder(new LineBorder(Color.WHITE,3)); 

    undo.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent arg0) { 
      // TODO Auto-generated method stub 
      Controler.pieces.undo(); 
      Controler.reDraw(); 

     } 
    }); 
    replay.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent arg0) { 
      // TODO Auto-generated method stub 
      System.out.println("Dastiii"); 
     } 
    }); 
    **/ 

} 

在看看：

• Performing Custom Painting
• Painting in AWT and Swing

有关如何与画什么更多的细节是在Swing