Classes - Building Java Programs: A Back to Basics Approach - page 528

15 setLocation(x, y);
16 }
17
18 // returns the distance between this Point and (0, 0)
19 public double distanceFromOrigin() {
20 return Math.sqrt(x * x + y * y);
21 }
22
23 // returns the x-coordinate of this point
24 public int getX() {
25 return x;
26 }
27
28 // returns the y-coordinate of this point
29 public int getY() {
30 return y;
31 }
32
33 // sets this point's (x, y) location to the given values
34 public void setLocation( int x, int y) {
35 this .x = x;
36 this .y = y;
37 }
38
39 // returns a String representation of this point
40 public String toString() {
41 return "(" + x + ", " + y + ")";
42 }
43
44 // shifts this point's location by the given amount
45 public void translate( int dx, int dy) {
46 setLocation(x + dx, y + dy);
47 }
48 }
Here's the corresponding final version of our client program, which now uses the
Point constructors and methods appropriately:
1 // A program that deals with points.
2 // Fourth version, to accompany encapsulated Point class.
3
4 public class PointMain {
5 public static void main(String[] args) {
6 // create two Point objects
7 Point p1 = new Point(7, 2);