继承与多态动手动脑实验

1.

 

运行代码:

package test3;

class Grandparent
{

public Grandparent()
{

System.out.println("GrandParent Created.");

}

public Grandparent(String string)
{

System.out.println("GrandParent Created.String:" + string);

}

}

 

class Parent extends Grandparent
{

public Parent()
{

//super("Hello.Grandparent.");

System.out.println("Parent Created");

// super("Hello.Grandparent.");

}

}

 

class Child extends Parent
{

public Child()
{

System.out.println("Child Created");

}

}

 

public class Ch
{

public static void main(String args[])
{

Child c = new Child();

}

}

运行结果:

 

 

 2.