Calculating area of Rectangle using Class and Object

class Rectangle{

int length;

int width;

void assignValue(int l, int w){

length =l;

width = w;

}

void calculateArea(){

System.out.println("Area of Rectangle is = "+length*width);

}

}

public class TestRectangle{

public static void main(String args[]){

Rectangle r1 = new Rectangle();

Rectangle r2 = new Rectangle();

Rectangle r3 = new Rectangle();

r1.assignValue(2,5);

r2.assignValue(14,15);

r3.assignValue(24,25);

r1.calculateArea();

r2.calculateArea();

r3.calculateArea();

}

}