JAVA进阶18

 1 package cn.xfj.game;
 2 
 3 import javax.swing.*;
 4 import java.awt.event.WindowAdapter;
 5 import java.awt.event.WindowEvent;
 6 
 7 //飞机游戏的主窗口
 8 public class MyGameFrame extends JFrame {
 9     //初始化窗口
10     public void launchFrame() {
11         this.setTitle("My first game");
12         this.setVisible(true);
13         this.setSize(500,500);
14         this.setLocation(200,200);
15 
16         this.addWindowListener(new WindowAdapter(){
17             public void windowCloing(WindowEvent e){
18                 System.exit(0);
19             }
20         });
21     }
22 
23     public static void main(String[] args) {
24         MyGameFrame f = new MyGameFrame();
25         f.launchFrame();
26     }
27 }

 1 package cn.zh.abstrac;
 2 
 3 //抽象类
 4 abstract class Animal{
 5     //抽象方法
 6     abstract public void shout();
 7 }
 8 class Dog extends Animal{
 9     //子类必须实现父类的抽象方法，否则编译错误
10     public void shout(){
11         System.out.println("www...");
12     }
13     public void seeDoor(){
14         System.out.println("seedoor...");
15     }
16 }
17 //测试抽象类
18 public class TestAbstractClasss {
19     public static void main(String[] args) {
20         Dog g = new Dog();
21         g.shout();
22         g.seeDoor();
23     }
24 }