继承、方法重写小案例

 1 package com.kehou.print;
 2 
 3 /**
 4  * 父类：打印机类
 5  * @author 
 6  *
 7  */
 8 public abstract class Printer {
 9     public abstract void print();
10 }

 1 package com.kehou.print;
 2 
 3 /**
 4  * 子类：针式打印机类
 5  * @author 
 6  *
 7  */
 8 public class DotMatrixPrinter extends Printer{
 9 
10     public void print() {
11         System.out.println("这是针式打印机，开始打印了.......");
12     }
13     
14 }

 1 package com.kehou.print;
 2 
 3 /**
 4  * 喷墨打印机类
 5  * @author 
 6  *
 7  */
 8 public class InkpetPrinter extends Printer {
 9 
10     public void print() {
11         System.out.println("这是喷墨打印机，开始打印了......");
12     }
13 
14 }

 1 package com.kehou.print;
 2 
 3 /**
 4  * 激光打印机类
 5  * @author 
 6  *
 7  */
 8 public class LaserPrinter extends Printer {
 9 
10     public void print() {
11         System.out.println("这是激光打印机，开始打印了......");
12     }
13 
14 }

 1 package com.kehou.print;
 2 
 3 public class Test {
 4 
 5     public static void main(String[] args) {
 6         Printer dmp=new DotMatrixPrinter();
 7         dmp.print();
 8         
 9         Printer ipp=new InkpetPrinter();
10         ipp.print();
11         
12         Printer lp=new LaserPrinter();
13         lp.print();
14     }
15 
16 }