JAVA进阶16

间歇性混吃等死，持续性踌躇满志系列-------------第16天

1、桌球游戏小项目

①窗口加载

 import javax.swing.*;

 public class BallGame extends JFrame {

     //窗口加载
     void launchFrame() {
         setSize(300, 300);
         setLocation(100, 100);
         setVisible(true);
     }

     public static void main(String[] args) {
         System.out.println("游戏体验");
         BallGame game = new BallGame();
         game.launchFrame();
     }
 }

窗口加载

运行结果图

②小球左右移动

注：图片加载不出可尝试用绝对路径

 import javax.swing.*;
 import java.awt.*;

 public class BallGame extends JFrame {

     Image ball = Toolkit.getDefaultToolkit().getImage("F:/Java/MyGame/Demo01/images/ball.png");
     Image desk = Toolkit.getDefaultToolkit().getImage("F:/Java/MyGame/Demo01/images/desk.jpg");
     //小球的横坐标
     double x = 100;
     //小球的纵坐标
     double y = 100;
     //方向
     boolean right = true;

     //画窗口的方法
     public void paint(Graphics g) {
         System.out.println("窗体被画了一次！");
         g.drawImage(desk, 0, 0, null);
         g.drawImage(ball, (int) x, (int) y, null);

         if (right) {
             x += 10;
         } else {
             x -= 10;
         }
         //856是窗口宽度，40是桌子边框的宽度，30是小球的直径
         if (x > 856-40-30) {
             right = false;
         }
         //40是桌子边框的宽度
         if (x < 40) {
             right = true;
         }
     }

     //窗口加载
     void launchFrame() {
         setSize(856, 500);
         setLocation(50, 50);
         setVisible(true);

         //重画窗口,每秒画25次
         while (true) {
             repaint();
             try {
                 Thread.sleep(40);
             } catch (Exception e) {
                 e.printStackTrace();
             }

         }
     }

     public static void main(String[] args) {
         System.out.println("游戏体验");
         BallGame game = new BallGame();
         game.launchFrame();
     }
 }

小球左右移动

运行结果图

③实现圆球上下弹动

 import javax.swing.*;
 import java.awt.*;

 public class BallGame01 extends JFrame {

     Image ball = Toolkit.getDefaultToolkit().getImage("F:/Java/MyGame/Demo01/images/ball.png");
     Image desk = Toolkit.getDefaultToolkit().getImage("F:/Java/MyGame/Demo01/images/desk.jpg");
     //小球的横坐标
     double x = 100;
     //小球的纵坐标
     double y = 100;

     //弧度，此处就是60度
     double degree = 3.14 / 3;

     //画窗口的方法
     public void paint(Graphics g) {
         System.out.println("窗体被画了一次！");
         g.drawImage(desk, 0, 0, null);
         g.drawImage(ball, (int) x, (int) y, null);

         x = x + 10 * Math.cos(degree);
         y = y + Math.sin(degree);

         if (y > 500 - 40 - 30 || y < 40) {
             degree = -degree;
         }
         if (x < 0 || x > 856) {
             degree = 3.14 - degree;
         }
     }

     //窗口加载
     void launchFrame() {
         setSize(856, 500);
         setLocation(50, 50);
         setVisible(true);

         //重画窗口,每秒画25次
         while (true) {
             repaint();
             try {
                 Thread.sleep(40);
             } catch (Exception e) {
                 e.printStackTrace();
             }

         }
     }

     public static void main(String[] args) {
         System.out.println("游戏体验");
         BallGame01 game = new BallGame01();
         game.launchFrame();
     }
 }

运行结果图

2、三元运算符

 public class TestOperator01 {
     public static void main(String[] args) {
 //        boolean b1 = true;
 //        boolean b2 = false;
 //        System.out.println(b1 & b2);
 //        System.out.println(b1 ^ b2);
 //        System.out.println(b1 || b2);
 //        System.out.println(!b2);
 //
         //三元运算符
         int score = 80;
         String type = score<60?"不及格":"及格";
         System.out.println(type);

         //条件判断
         if (score>60){
             System.out.println("及格");
         }else {
             System.out.println("不及格");
         }
     }
 }

运行结果图

3、嵌套循环

 import java.util.Scanner;

 public class TestOperator01 {
     public static void main(String[] args) {
         for (int i = 1; i <= 5; i++) {
             for (int j = 1; j <= 5; j++) {
                 System.out.print(i+"\t");
             }
             System.out.println(" ");
         }
     }
 }

运行结果图

4、嵌套循环打印九九乘法表

 public class TestOperator01 {
     public static void main(String[] args) {
         for (int i = 1; i < 10; i++) {
             for (int j = 1; j <= i; j++) {
                 System.out.print(j+"*"+i+"="+i*j+"\t");
             }
             System.out.println();
         }
     }
 }

运行结果图

5、循环输出1-1000之间能被5整除的数，且每行输出5个

 public class TestOperator01 {
     public static void main(String[] args) {
         int h = 0;
         for (int i = 1; i <= 1000; i++) {
             if (i%5==0){
                 System.out.print(i+"\t");
                 h++;
             }
             if (h==5){
                 System.out.println();
                 h=0;
             }
         }
         }
     }

运行结果图