JPanel KeyListener不起作用 [英] JPanel KeyListener Not Working

问题描述

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

public class AnaPencere{
    JFrame pen;
    AnaPencere(){
        pen = new JFrame("Ana Pencere");
        pen.setSize(613, 253);
        pen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pen.setLocationRelativeTo(null);
        pen.setResizable(false);
        pen.add(new Cizim());
        pen.setVisible(true);
    }


    private class Cizim extends JPanel{

        private Cizim() {
            this.addKeyListener(new KeyAdapter() {
                @Override
                public void keyReleased(KeyEvent e) {
                    System.out.println(e.getKeyCode());
                }
            });
        }
    }
}

运行项目时，一切正常，但是当我按一个键时，在控制台中看不到预期的结果

When I run the project, everything works as expected, but when I press a key, I am not seeing the expected result in the console

推荐答案

• 为JPanel添加setFocusable(true)并添加KeyListener

  • add setFocusable(true) for JPanel with added KeyListener

    也许没有理由去寻找Focus，setFocusable，而使用KeyBindings

    maybe there no reason to hunting for Focus, setFocusable, use KeyBindings instead

    您可以以编程方式设置组件层次结构中的焦点

    这篇关于JPanel KeyListener不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！