(this is question1)

public abstract class Shape {

public Shape() { }

public abstract double area() ;

public String who() { return "Shape" ; }

}

public class Circle extends Shape {

private int radius ;

public Circle( int r )

{

radius = r ;

}

@Override

public double area()

{

return Math.PI * radius * radius ;

}

}

public class Square extends Shape {

private int _sideLength ;

public Square( int sideLength )

{

/* TODO question 45 */

}

@Override

public double area()

{

return _sideLength * _sideLength ;

}

}

What is the output of the following code (approximate answer ok if needed)? Assume your constructor from question 1 above has been implemented and the following code is contained within a driver class.

public static void main(String[] args) {

report(new Circle(4));

report(new Square(5));

}

public static void report( Shape s ) {

System.out.println(s.who());

System.out.println(s.area());

}