JavaSE 第十八讲 多态剖析 10.5

1.方法重写

public class InheritenceTest2
{
   public static void main(String[] args)
   {
          Dog dog = new Dog();
      dog.run();
   }
}

class Animal
{
    public void run()
{
        System.out.println("animal is running");
}
    }

class Dog extends Animal
{
    public void run()
{
       System.out.println("dog is running");
       super.run();//调用父类的run方法
}
}

2. public class InheritenceTest3
   {
   public static void main(String[] args)
   {
   Son son = new Son();
   }
   }

   class Grandpa
   {
   public Grandpa()
   {
   System.out.println("grandpa");
   }
   }

   class Father extends Grandpa
   {
   public Father()
   {
   System.out.println("father");
   }
   }

   class Son extends Father
   {
   public Son()
   {
   System.out.println("son");
   }
   }