第五次课后实验

6. 继承与接口

package 程序;

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 TestInherits {

public static void main(String args[]) {

Child c = new Child();

}

}





package p;

public class Address {

/**

* @param args

*/

public static void main(String[] args) {

System.out.println(new A());

}

}



class A{}

package p;

public class Fruit

{

public String toString()

{

return "Fruit toString.";

}

public static void main(String args[])

{

Fruit f=new Fruit();

System.out.println("f="+f);

System.out.println("f="+f.toString());

}

}