JAVA 开发实例 一 移动的小球
package com.java.move; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.GraphicsConfiguration; import java.awt.HeadlessException; import java.awt.Toolkit; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import javax.swing.*; /* * * author : deng_hui_long * Date : 2013-10-16 * */ public class TextMove extends JFrame { private int width = 500;// 窗口的宽度 private int height = 500;// 宽口的高度 private Toolkit took = null;// 将各个组件绑定 private TextPanel textPanel = null; public static void main(String[] args) { new TextMove().show(); } public TextMove() { setTitle("移动的小球"); took = Toolkit.getDefaultToolkit(); Dimension dm = took.getScreenSize();// 获取屏幕的 宽度和高度 int swidth = (dm.width - this.width) / 2; int sheight = (dm.height - this.height) / 2; setLocation(swidth, sheight);// 窗口居于屏幕中间 setSize(width, height);// 设置窗体的大小 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 关闭 textPanel = new TextPanel(10, 10);// 面板 add(textPanel);// 添加面板 addKeyListener(new Keyent());// 添加键盘事件 } // 键盘事件 class Keyent extends KeyAdapter { @Override public void keyPressed(KeyEvent e) { if (e.getKeyCode() == KeyEvent.VK_UP) {// 上 textPanel.y -= 5; } else if (e.getKeyCode() == KeyEvent.VK_DOWN) {// 下 textPanel.y += 5; } else if (e.getKeyCode() == KeyEvent.VK_LEFT) {// 左 textPanel.x -= 5; } else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {// 右 textPanel.x += 5; } textPanel.repaint();// 重新绘图 } } // 继承面板在面板上绘图 class TextPanel extends JPanel {// 继承面板 int x; int y; public TextPanel(int x, int y) { this.x = x; this.y = y; } public void paint(Graphics g) {// 在面板上绘图 super.paint(g); g.setColor(Color.black);// 设置画笔的颜色 g.fillOval(x, y, 20, 20);// 画圆 } } }