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package chapter16;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.event.KeyAdapter;
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import java.awt.event.KeyEvent;
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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@SuppressWarnings("serial")
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public class KeyEventDemo extends JFrame{
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aa one = new aa();
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public KeyEventDemo (){
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add(one);
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one.setFocusable(true);
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}
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public static void main(String[] args) {
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KeyEventDemo frame = new KeyEventDemo();
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frame.setTitle("KeyEventDemo");
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frame.setLocationRelativeTo(null);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setSize(300, 300);
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frame.setVisible(true);
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}
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static class aa extends JPanel{
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private int x = 50;
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private int y = 50;
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private char keychar = ‘A‘;
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public aa(){
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addKeyListener(new KeyAdapter() {
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public void keyPressed(KeyEvent e) {
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switch (e.getKeyCode()) {
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case KeyEvent.VK_DOWN: y += 10; break;
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case KeyEvent.VK_UP: y -= 10; break;
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case KeyEvent.VK_LEFT: x -= 10; break;
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case KeyEvent.VK_RIGHT: x += 10; break;
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default: keychar = e.getKeyChar();
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}
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repaint();
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}
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});
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}
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protected void paintComponent(Graphics g){
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super.paintComponent(g);
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g.setFont(new Font("TimesRoman",Font.PLAIN,24));
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g.drawString(String.valueOf(keychar), x, y);
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}
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}
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}
点击键盘上的字母，输出在屏幕上，如果不是字母，不显示
另外 按方向键，可以控制字母的左右上下方向移动
【JAVA语言程序设计基础篇】--事件驱动程序设计--键盘事件
原文：http://blog.csdn.net/qq_24653023/article/details/52235202
