public class Rectangle {
  public int width = 0;
  public int height = 0;
  public Point origin;

  // four constructors
  public Rectangle() {
    origin = new Point(0, 0);
  }
  public Rectangle(Point p) {
    origin = p;
  }
  public Rectangle(int w, int h) {
    this(new Point(0, 0), w, h);
  }
  public Rectangle(Point p, int w, int h) {
    origin = p;
    width = w;
    height = h;
  }

  // a method for moving the rectangle
  public void move(int x, int y) {
    origin.x = x;
    origin.y = y;
  }

  // a method for computing the area of the rectangle
  public int area() {
    return width * height;
  }
}