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I got ' r can't be resolved error'; how should I construct Rectangle r?

x and y are the co-ordinates of upper left corner and height and width are given as above. It suppose to return perimeter of the rectangle. I could n't find where to start? I know the formula to get...

public class Rectangle {



public static void main(String[] args) {


}

public Rectangle(int x, int y, int height, int width)