哪个大佬能给解释一下 为什么键盘没有监听到

[lenlir]

import javax.swing.JFrame; import javax.swing.WindowConstants; public class GameFrame { public static void main(String[] args) { JFrame j1 = new JFrame(); j1.setVisible(true); j1.setBounds(100,100,570,613); j1.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); j1.add(new GamePanel()); } } import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import javax.swing.JPanel; public class GamePanel extends JPanel { public GamePanel() { this.addKeyListener(new Listen()); } class Listen extends KeyAdapter{ @Override public void keyPressed(KeyEvent e) { if(e.getKeyCode()==KeyEvent.VK_SPACE) { System.out.println("按了空格"); } } }}

[sun0322]

要是没有记错的话，你得使用匿名的内部类才能解决。 【KeyEvent 匿名内部类】随便百度了一下，凑付看下吧 https://blog.csdn.net/LeoZuosj/article/details/104230051 自己也可以，以此为方向查一查

[qybao]

因为你的GamePanel没法聚焦，一个组件要响应事件就要先获得焦点，否则发生的事件也只会是其他正在聚焦的组件而不是你的GamePanel。 你可以修改main方法 GamePanel gp = new GamePanel(); j1.add(gp);//最好j1能setLayout if (gp.isFocusable()) { gp.requestFocuse(); //主动获取焦点 }

[do_wa5810]

引用 楼主 weixin_44852871 的回复:

import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class GameFrame {
public static void main(String[] args) {
JFrame j1 = new JFrame();
j1.setVisible(true);
j1.setBounds(100,100,570,613);
j1.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
j1.add(new GamePanel());
}

}




import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JPanel;

public class GamePanel extends JPanel {
public GamePanel() {
this.addKeyListener(new Listen());
}
class Listen extends KeyAdapter{
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_SPACE) {
System.out.println("按了空格");
}
}
}}

你这addKeyListener用的就不对啊；

JFrame jf = new JFrame();

jf.addKeyListener(new KeyListener() {
    @Override
    public void keyPressed(KeyEvent e) {
        // 获取键值，和 KeyEvent.VK_XXXX 常量比较确定所按下的按键
        int keyCode = e.getKeyCode();
        System.out.println("按下: " + e.getKeyCode());
    }
    
    @Override
    public void keyTyped(KeyEvent e) {
        // e.getKeyChar() 获取键入的字符
        System.out.println("键入: " + e.getKeyChar());
    }
    
    @Override
    public void keyReleased(KeyEvent e) {
        System.out.println("释放: " + e.getKeyCode());
    }
});