11.13

package top.hyself;

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

    }
    public abstract void fun();
}
class B extends A{
    public B(String name) {
        super(name);
    }
    public void fun() {
        System.out.println(super.getName());
    }
}
public class This {
    public static void main(String[] args)
 {

        B b = new B(null);
        b.fun();
    }
}

11.13

原文：http://www.cnblogs.com/ELF-CH/p/7862993.html