Java 抽象类

 1 package com.qugeng.jdk;
 2 
 3 public class MethodDemo {
 4     public static void main(String[] args) {
 5         AbsDemo a = new AbsDemo();
 6         a.say();
 7         a.print();
 8     }
 9 }
10 
11 abstract class  Abs{
12     private int age;
13     public void tell(){
14     }
15     public abstract void say();
16     public abstract void print();
17 }
18 
19  /**
20   * 子类必须重写父类的方法
21   * @author Administrator
22   *
23   */
24  class AbsDemo extends Abs
25 {
26     public void say() {
27     }
28     public void print(){
29         
30     }
31 }
32  

 1 package com.qugeng.jdk;
 2 
 3 public class MethodDemo {
 4     public static void main(String[] args) {
 5         A a = new A();
 6         a.tell();
 7         System.out.println();
 8     }
 9 }
10 
11 interface Inter2
12 {
13     public abstract  void say();
14     
15 }
16 
17 abstract class Abs1{
18     public abstract void print();
19 }
20 
21 interface Inter1{
22     
23     public static final int AGE = 100;
24     public abstract void tell();
25 }
26 
27 
28  class A extends Abs1 implements Inter1,Inter2{
29     public void tell(){
30         
31     }
32     public void say()
33     {
34         
35     }
36     public void print()
37     {
38         
39     }
40 }