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Java > Open Source Codes > sample > duplicate > Ball


1 package sample.duplicate;
2
3 import java.awt.Graphics JavaDoc;
4 import java.awt.Color JavaDoc;
5
6 public class Ball {
7     private int x, y;
8     private Color JavaDoc color;
9     private int radius = 30;
10     private boolean isBackup = false;
11
12     public Ball(int x, int y) {
13     move(x, y);
14     changeColor(Color.orange);
15     }
16
17     // This constructor is for a backup object.
18
public Ball(Ball b) {
19     isBackup = true;
20     }
21
22     // Adjust the position so that the backup object is visible.
23
private void adjust() {
24     if (isBackup) {
25         this.x += 50;
26         this.y += 50;
27     }
28     }
29
30     public void paint(Graphics JavaDoc g) {
31     g.setColor(color);
32     g.fillOval(x, y, radius, radius);
33     }
34
35     public void move(int x, int y) {
36     this.x = x;
37     this.y = y;
38     adjust();
39     }
40
41     public void changeColor(Color JavaDoc color) {
42     this.color = color;
43     }
44 }
45
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