/** An instance represents a point (x, y) in the plane */
public class Point {
    private int x;  // x-coordinate
    private int y; // y-coordinate
    
    /** Constructor: A point (x, y) */
    public Point(int x, int y) {
      this.x= x;
      this.y= y;
    }
   
    /** =  repr. of this point in form "(x, y)" */
    public String toString() {
            return "("  +  x  +  ", "  + y  + ")";
    }
}

// "this" is an expresssion that evaluates to the name of the object in which it occurs