Java多态之重写<一>

package com.test;

class A{
    public void say(){
        System.out.println("Hello ,A");
    }
}

class B extends A{
    public void say(){
        System.out.println("Hello ,B");
    }
}

class C extends B{
    public void say(){
        System.out.println("Hello ,c");
    }
}

public class Demo02 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        A a = new A() ;
        a.say() ;
        System.out.println("-------------------------");
        B b = new B() ;
        b.say() ;
        System.out.println("-------------------------");
        C c = new C() ;
        c.say() ;        
    }

}