Program to implement single inheritance using super keyword

class Box

{

float width,length;

Box()

{

width=0;

length=0;

}

Box(float w,float l)

{

width=w;

length=l;

}

Box(Box ob)

{

width=ob.width;

length=ob.length;

}

void area()

{

System.out.println("Area is: "+(width*length));

}

}

class BigBox extends Box

{

float depth;

BigBox()

{

super(0,0);

depth=0;

}

BigBox(Box ob,float d)

{

super(ob);

depth=d;

}

void volume()

{

System.out.println("Volume is: "+(width*length*depth));

}

}

class SuperEx

{

public static void main(String args[])

{

Box b=new Box(1.5f,2.5f);

BigBox bb=new BigBox(b,3.5f);

bb.area();

bb.volume();

}

}

OUTPUT:

C:\Program Files\Java\jdk1.7.0\bin>java SuperEx

Area is: 3.75

Volume is: 13.125