package cn.ch.w;

public abstract class A {
    public abstract void fun();
}

package cn.ch.w;

public class B extends A{
    public void fun(){
        System.out.println("嗨！你好小蘑菇！！");
    }
}

package cn.ch.w;

public class ABstractDemo {
    public static void mian(String args[]){
        B b=new B();
        b.fun();
    }

}

package cn.ch.w;

public abstract class A {
    private String name;
    public A(String name){
        this.name=name;
    }
    public String getnName(){
        return this.name;    
    }
    public abstract void fun();
}

package cn.ch.w;

public class B extends A{
    public B(String name){
        super(name);
    }
    public void fun(){
        System.out.print(super.getnName());
    }
}

package cn.ch.w;

public class AbstractDemo {

    public static void main(String[] args) {
        B b=new B("小蘑菇！！");
        b.fun();
    }

}