如何在JRadioButton上使用getSource（）？

Question

我需要和我的導師一起前言，不會讓我們在課堂上使用IDE，所以我在文本板中這樣做。我想單擊raido按鈕並更改「交通燈」顏色。我如何使用getSource（）與單選按鈕進行交互？

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



public class Lab4Frame extends JFrame { 

    Lab4Frame(){ 
     setTitle("Lab 4 - Application #1"); 
     Lab4Panel p = new Lab4Panel(); 
     Lab4RadioButtonPanel p2 = new Lab4RadioButtonPanel(); 
     setLayout(new GridLayout(2,1)); 
     add(p); 
     add(p2); 
    } 

    public static void main(String[] args){ 

      Lab4Frame frame = new Lab4Frame(); 
      frame.setTitle("Lab4 Application # 1"); 
      frame.setLocationRelativeTo(null); 
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      frame.setSize(600, 600); 
      frame.setVisible(true); 
    } 

} 

class Lab4RadioButtonPanel extends JPanel implements MouseListener { 

    public Lab4RadioButtonPanel() { 

     this.setLayout(new FlowLayout()); 
     JRadioButton jrbRed = new JRadioButton("Red", true); 
     JRadioButton jrbYellow = new JRadioButton("Yellow"); 
     JRadioButton jrbGreen = new JRadioButton("Green"); 
     this.setBorder(BorderFactory.createLineBorder(Color.black)); 
     ButtonGroup group = new ButtonGroup(); 
     group.add(jrbRed); 
     group.add(jrbYellow); 
     group.add(jrbGreen); 

     this.add(jrbRed); 
     this.add(jrbYellow); 
     this.add(jrbGreen); 

     jrbRed.setMnemonic('E'); 
     jrbGreen.setMnemonic('G'); 
     jrbYellow.setMnemonic('Y'); 
    } 




      public void mouseClicked(MouseEvent e) 
       { 
        if (e.getSource() == jrbRed){ 

        } 

        else if (e.getSource() == jrbYellow){ 

        } 

        else if (e.getSource() == jrbGreen){ 

        } 



       } 

     public void mouseExited(MouseEvent e){} 
     public void mouseReleased(MouseEvent e){} 
     public void mousePressed(MouseEvent e){} 
     public void mouseMoved(MouseEvent e){} 
     public void mouseEntered(MouseEvent e){} 
} 

class Lab4Panel extends JPanel{ 


    public Lab4Panel(){ 
    } 



    int height, width; 
    int radius = 5; 
    int x = -1; 
    int y = -1; 

    protected void paintComponent(Graphics g){ 
     if (x<0 || y<0) { 
      x = getWidth()/2 - radius; 
      y = getHeight()/2 - radius; 
     } 
     super.paintComponent(g); 
     g.drawRect(x - 10,y - 90, 40, 120); 
     //g.drawOval(x,y - 80, 4 * radius, 4 * radius); 
     //g.drawOval(x,y - 40, 4 * radius, 4 * radius); 
     //g.drawOval(x,y, 4 * radius, 4 * radius); 
     g.drawRect(x - 5,y - 90, 40, 120); 
     g.setColor(Color.RED); 
     g.fillOval(x,y - 80, 4 * radius, 4 * radius); 
     g.setColor(Color.YELLOW); 
     g.fillOval(x,y - 40, 4 * radius, 4 * radius); 
     g.setColor(Color.GREEN); 
     g.fillOval(x,y, 4 * radius, 4 * radius); 

    } 


} 

Answer 1

請勿使用帶按鈕的鼠標偵聽器，包括單選按鈕。改爲使用動作偵聽器。同樣爲任何聽衆的工作，它必須首先添加到組件。