看看谁能帮我搞定这个困扰了我一个晚上的鼠标事件问题

Question

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Edible extends JFrame{

public Edible(){
KeyBoardPanel keyBoardPanel1 = new KeyBoardPanel();
KeyBoardPanel keyBoardPanel2 = new KeyBoardPanel();
setLayout(new GridLayout(2,1));
add(keyBoardPanel1);
add(keyBoardPanel2);
}
public static void main(String[] args){
Edible frame = new Edible();
frame.setTitle("Test Winedows");
frame.setLocation(100, 100);
frame.setSize(300, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
class KeyBoardPanel extends JPanel{

private int x = 100;
private int y = 100;
private char keyChar = 'A';
public KeyBoardPanel(){
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e){
switch(e.getKeyCode()){
case KeyEvent.VK_DOWN:y+= 10;break;
case KeyEvent.VK_UP:y-= 10;break;
case KeyEvent.VK_LEFT:x-= 10;break;
case KeyEvent.VK_RIGHT:x+= 10;break;
default:keyChar = e.getKeyChar();
}
repaint();
}
});

addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
//setFocusable(true);
}
});
}
protected void paintComponent(Graphics g){
super.paintComponent(g);
g.setFont(new Font("TimesRoman",Font.PLAIN,24));
g.drawString(String.valueOf(keyChar), x, y);
}
}
}简要说明一下我的问题，我画了两个面板，当我键盘上按下一个键时，他会在面板上显示字符，而且可以根据我按上下左右移动（这些都不关键），主要问题是：我需要当我的鼠标在其中一个面板上点击后，就使那一块面板接受KeyEvent，我注释的代码是错误的，请问各位，怎样修改才可以，谢谢了

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Edible extends JFrame{
    
    public Edible(){
        KeyBoardPanel keyBoardPanel1 = new KeyBoardPanel();
        KeyBoardPanel keyBoardPanel2 = new KeyBoardPanel();
        setLayout(new GridLayout(2,1));
        add(keyBoardPanel1);
        add(keyBoardPanel2);
    }
    public static void main(String[] args){
        Edible frame = new Edible();
        frame.setTitle("Test Winedows");
        frame.setLocation(100, 100);
        frame.setSize(300, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    class KeyBoardPanel extends JPanel{
        
        private int x = 100;
        private int y = 100;
        private char keyChar = 'A';
        public KeyBoardPanel(){
            addKeyListener(new KeyAdapter(){
                public void keyPressed(KeyEvent e){
                    switch(e.getKeyCode()){
                        case KeyEvent.VK_DOWN:y+= 10;break;
                        case KeyEvent.VK_UP:y-= 10;break;
                        case KeyEvent.VK_LEFT:x-= 10;break;
                        case KeyEvent.VK_RIGHT:x+= 10;break;
                        default:keyChar = e.getKeyChar();
                    }
                    repaint();
                }
            });
            
            addMouseListener(new MouseAdapter(){
                public void mouseClicked(MouseEvent e){
                   requestFocus(true);
                }
            });
        }
        protected void paintComponent(Graphics g){
            super.paintComponent(g);
            g.setFont(new Font("TimesRoman",Font.PLAIN,24));
            g.drawString(String.valueOf(keyChar), x, y);
        }
    }
}
就一步