Why is it not a good idea to introduce an instance variable for the area? And how do you fix it, thanks :     public class Square {
    private int sideLength;
    private int area;     // Not a good idea
    public Square(int length) {
    sideLength = length; }
    public int getArea() {
    area = sideLength * sideLength;
    return area; }
    }
Why is it not a good idea to introduce an instance variable for the area? And how do you fix it, thanks

