键盘控制小游戏简化版（功能添加更新。。）

来源：互联网发布：克利夫兰州立大学知乎编辑：程序博客网时间：2024/05/16 04:33

JAVA入门级小程序，个人感觉可以引发外行人对JAVA产生一些兴趣，如果我刚接触JAVA的时候能碰到这种程序就好了，我就不会这么被动的学JAVA了，到现在也学的很零散，没能形成系统知识。兴趣是最好的老师。努力学习JAVA中。。。

以下贴出代码，附有程序运行结果图。所用代码均只用作演示，存在不少缺陷。

实现了键盘方向键控制的最简单的球的移动及边缘判定，打印出球的实时坐标。

/** *  */package ballgame;import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;/** * 2014-6-11 *  * @author Gelar */public class BallGame extends Frame {/** *  */private static final long serialVersionUID = 1L;Image ball = Toolkit.getDefaultToolkit().getImage("images/ball.jpg");double x = 250;double y = 200;double xCoord = 250;double yCoord = 200;boolean left, right, up, down;public void paint(Graphics g) {g.drawImage(ball, (int) x, (int) y, null);if (left && x > 0) {x = x - 10;xCoord = x;printCoords();}if (right && x < 470) {x = x + 10;xCoord = x;printCoords();}if (up && y > 30) {y = y - 10;yCoord = y;printCoords();}if (down && y < 370) {y = y + 10;yCoord = y;printCoords();}}void launchFrame() {setSize(500, 400);setLocation(420, 170);setBackground(Color.black);setTitle("Ball Game");setVisible(true);new PaintThread().start();addKeyListener(new KeyMonitor());printInitialCoords();}void printInitialCoords() {System.out.println("(250.0,200.0)");}void printCoords() {if (left || right || up || down) {System.out.println("(" + xCoord + "," + yCoord + ")");}}public static void main(String[] args) {new BallGame().launchFrame();}class PaintThread extends Thread {public void run() {while (true) {repaint();try {Thread.sleep(200);} catch (InterruptedException e) {e.printStackTrace();}}}}class KeyMonitor extends KeyAdapter {public void keyPressed(KeyEvent e) {if (37 == e.getKeyCode()) {left = true;}if (39 == e.getKeyCode()) {right = true;}if (38 == e.getKeyCode()) {up = true;}if (40 == e.getKeyCode()) {down = true;}}public void keyReleased(KeyEvent e) {if (37 == e.getKeyCode()) {left = false;}if (39 == e.getKeyCode()) {right = false;}if (38 == e.getKeyCode()) {up = false;}if (40 == e.getKeyCode()) {down = false;}}}}

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