Generic and Inheritance

Generics and Inheritance

 // Generics and Inheritance 

class Rectangle<T extends Number>

{

T l, b;

public Rectangle(T x, T y)

{

l = x;

b = y;

}

void fnArea()

{

System.out.println("Area = "+(l.doubleValue()*b.doubleValue()));

}

}

class Box<T extends Number> extends Rectangle<T>

{

T h;

public Box(T x, T y, T z)

{

super(x, y);

h = z;

}

void fnVolume()

{

System.out.println("Volume = "+(l.doubleValue()*b.doubleValue()*h.doubleValue()));

}

}

class Generics_Demo

{

public static void main(String as[])

{

Box<Integer> obj1 = new Box<Integer>(5,6,2);

obj1.fnArea();

obj1.fnVolume();

Box<Double> obj2 = new Box<Double>(2.1,4.3,6.5);

obj2.fnArea();

obj2.fnVolume();

}

}

// Sample Output

>javac Generics_Demo.java

>java Generics_Demo

Area = 30.0

Volume = 60.0

Area = 9.03

Volume = 58.7

>