当面板JPanel失去焦点时，怎么重新获得焦点_Java相关

当面板JPanel失去焦点时，怎么重新获得焦点

/*
下面是我写得一个测试的程序，运行后，不点击按钮的情况下，按小写状态下的'w'时，弹出对话框，
但是当点击按钮后，面板上的监听失去了，我想用鼠标监听把焦点设置回来，可是不好使了
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class testjiaodian extends JFrame
{
    JPanel apanel;
    public testjiaodian()
    {
        setSize(100,100);
        apanel=new JPanel();
        apanel.addMouseListener(new MouseHandler());
        apanel.addKeyListener(new keyhandle());
        apanel.setFocusable(true);
        apanel.add(new JButton("点我"));
        add(apanel);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    private class MouseHandler extends MouseAdapter
    {
        public void mousePressed(MouseEvent event)
        {
            apanel.setFocusable(true);
        }
    }
    private class keyhandle implements KeyListener
    {
        public void keyPressed(KeyEvent event){}
        public void keyReleased(KeyEvent event){}
        public void keyTyped(KeyEvent event)
        {
            int i;
            char keychar = event.getKeyChar();
            if(keychar == 'w')
            {
                JOptionPane.showMessageDialog(null, "键盘响应", "信息", JOptionPane.DEFAULT_OPTION   );
            }
        }
    }
    public static void main(String args[])
    {
        new testjiaodian();
    }
};

搜索更多相关的解决方案: JPanel 面板焦点

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下班前，上了下论坛，给你修改了下，不知道是否符合你的要求。下线了

程序代码：

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class testjiaodian extends JFrame
{
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    JPanel apanel;
    JButton b;
    public testjiaodian()
    {
        setSize(100,100);
        apanel=new JPanel();
        apanel.addMouseListener(new MouseHandler());
        apanel.addKeyListener(new keyhandle());
        b =new JButton("点我");
        b.addMouseListener(new MouseHandler());
        apanel.add(b);
        add(apanel);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    private class MouseHandler extends MouseAdapter
    {
        public void mousePressed(MouseEvent event)
        {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    apanel.requestFocus(true);
                }
            });
        }
    }
    private class keyhandle implements KeyListener
    {
        public void keyPressed(KeyEvent event){}
        public void keyReleased(KeyEvent event){}
        public void keyTyped(KeyEvent event)
        {
            char keychar = event.getKeyChar();
            if(keychar == 'w')
            {
                JOptionPane.showMessageDialog(null, "键盘响应", "信息", JOptionPane.DEFAULT_OPTION   );
            }
        }
    }
    public static void main(String args[])
    {
        new testjiaodian();
    }
}

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回复 2楼 linjx0123

谢谢大侠~ 很好用，我的毕设就靠他了。。
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