package day01;
import java.awt.*; //導(dǎo)包
import javax.swing.*;//導(dǎo)包
public class BallGame extends JFrame {/*繼承JFrame*/
 Image ball=Toolkit.getDefaultToolkit().getImage("image/ball.png");
 Image desk=Toolkit.getDefaultToolkit().getImage("image/desk.jpg");
 double x=100;
 double y=100;
 boolean right=true;
 //畫桌面球窗口的方法
 public void paint(Graphics g ){
 //System.out.println("一次");
 g.drawImage(desk, 0, 0, null);
 g.drawImage(ball, (int)x, (int)y, null);
 // x=x+1;
 if(right)
  x=x+10;
 else
  x=x-10;
 if(x>856-40-30) //座框和球的直徑
  right=false;
 if(x<40) //座框
  right=true;
 }
 //窗口加載
 void launchFrame(){
 setSize(856,500);
 setLocation(50, 50);
 setVisible(true);
 //重畫窗口 一秒25次
 while(true)
 {
  repaint(); //重復(fù)paint這個函數(shù)
  //異常處理 try catch
  try {
  Thread.sleep(40);//40ms刷新
  } catch (Exception e) {
  e.printStackTrace();
  }
  
 }
 }
 //程序入口
 public static void main(String[] args) {
  System.out.println("桌球游戲");
  BallGame game =new BallGame();
  game.launchFrame();
 }

}

package day01;
import java.awt.*;
import javax.swing.*;
public class BallGame2 extends JFrame {
 Image ball=Toolkit.getDefaultToolkit().getImage("image/ball.png");
 Image desk=Toolkit.getDefaultToolkit().getImage("image/desk.jpg");
 double x=100;
 double y=100;
 double degree =3.14/3;
 //畫窗口的方法
 public void paint(Graphics g ){
 //System.out.println("一次");
 g.drawImage(desk, 0, 0, null);
 g.drawImage(ball, (int)x, (int)y, null);
 
 x=x+10*Math.cos(degree);
 y=y+10*Math.sin(degree);
 if(y>500-40-30|| y<40+40) // 框+座框  直徑
  degree=-degree;
 if(x<40||x>856-40-30)
  degree=3.14-degree;
 }
 //窗口加載
 void launchFrame(){
 setSize(856,500);
 setLocation(50, 50);
 setVisible(true);
 //重畫窗口 一秒25次
 while(true)
 {
  repaint();
  try {
  Thread.sleep(40);//40ms刷新
  } catch (Exception e) {
  e.printStackTrace();
  }
  
 }
 }
 //程序入口
 public static void main(String[] args) {
  System.out.println("桌球游戲");
  BallGame2 game =new BallGame2();
  game.launchFrame();
 }

}