[@talishboy][¥20]多层内部类继承，最内层的类如何实例化。（例如三层）

/**
 * @author Gjing
 **/
public class A {
    int getNum(){
        return 10;
    }
    public void fun(){
        System.out.println("你今天真好看！");
    }
}
class B extends A{
    public String getName(){
        //B类继承A类
        return "张三";
    }
    @Override
    public void fun(){//方法覆写
        System.out.println(this.getNum());
    }
}

/**
 * C类继承B类，相当于间接继承A类
 */
class C extends B{
    @Override
    public void fun(){
        System.out.println(this.getName());
    }
}

class Test{
    public static void main(String[] args){
        print(new A());
        print(new B());
        print(new C());
    }
    private static void print(A a){
        a.fun();
    }
}