New users cannot understand set and get.

I want to write a ball. This class can let external instances out and implement two attributes using the get and set methods. One is the ball radius and the other is the ball color. I wrote it like this, but when the class is called externally, the ball size cannot be changed when the ball is generated. Where is the error of my get and set methods?

Code

  1 package 
 2 
 3 {
 4 
 5        import flash.display.Sprite;
 6 
 7        public class Ball extends Sprite
 8 
 9        {
10 
11           private var _radius:Number;
12 
13           private var _color:uint;
14 
15 
16           public function Ball(){
17 
18                Init();
19 
20           }  
21 
22           private function Init():void{
23 
24                graphics.beginFill(color);
25 
26                graphics.drawCircle(0,0,radius);
27 
28                graphics.endFill();
29 
30           }
31 
32           public function set radius(rad:Number):void{
33 
34                _radius = rad;
35 
36           }
37 
38           public function get radius():Number{
39 
40                return _radius; 
41 
42           }
43 
44           public function set color(col:uint):void{
45 
46                _color = col; 
47 
48           }
49 
50           public function get color():uint{
51 
52                return _color; 
53 
54           }
55 
56        }
57 
58 }
59  

 

Code

 1. This part is divided into answers
2
3
4 Package
5
6 {
7
8 Import flash. display. Sprite;
9
10 public class ball extends Sprite
11
12 {
13
14 private VaR _ radius: number;
15
16 private VaR _ color: uint;
17
18 public function ball (radius: Number = 100, color: uint = 0xff0000 ){
19
20_radius = radius;
21
22 _ color = color;
23
24 Init ();
25
26}
27 private function Init (): void {
28 graphics. Clear ();
29
30 graphics. beginfill (_ color );
31
32 graphics. drawcircle (0, 0, _ radius );
33
34 graphics. endfill ();
35}
36
37 public function set radius (rad: Number): void {
38
39 _ radius = rad;
40
41 Init ();
42
43}
44
45 public function get radius (): number {
46
47 return _ radius;
48
49}
50
51 public function set color (COL: uint): void {
52
53 _ color = Col;
54
55 Init ();
56
57}
58
59 Public Function get color (): uint {
60
61 Return _ color;
62
63}
64
65}
66
67}
68