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BallMove.java
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BallMove.java
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package com.zzhow.event;
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
/**
* 2024年4月27日
*
* @author ZZHow
* @version 1.0
* 学习 Java 事件控制机制
* 案例:小球移动
*/
public class BallMove extends JFrame {
private MyPanel myPanel = null;
public static void main(String[] args) {
new BallMove();
}
public BallMove() {
myPanel = new MyPanel();
this.add(myPanel);
this.addKeyListener(myPanel);
this.setTitle("Ball Move");
this.setSize(500, 500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}
//画板
class MyPanel extends JPanel implements KeyListener {
private int x = 250;
private int y = 250;
@Override
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.BLACK);
g.setFont(new Font("Times New Roman", Font.BOLD, 30));
g.drawString("Ball Move", 180, 400);
g.drawString("@author ZZHow", 130, 430);
g.fillOval(x, y, 20, 20);
}
//监听字符输出
@Override
public void keyTyped(KeyEvent e) {
}
//监听按键按下
@Override
public void keyPressed(KeyEvent e) {
System.out.println((char) e.getKeyCode() + "按键被按下了!");
if (e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_S) {
y++;
} else if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_W) {
y--;
} else if (e.getKeyCode() == KeyEvent.VK_RIGHT || e.getKeyCode() == KeyEvent.VK_D) {
x++;
} else if (e.getKeyCode() == KeyEvent.VK_LEFT || e.getKeyCode() == KeyEvent.VK_A) {
x--;
}
//面板重绘
this.repaint();
}
//监听按键释放
@Override
public void keyReleased(KeyEvent e) {
}
}