as有关问题，初学者初学

as问题，菜鸟初学
package {
import flash.display.*;
public class DisplayListExample extends Sprite {

public function DisplayListExample( ) {
var red:Shape = createCircle( 0xFF0000, 10 );
red.x = 10;
red.y = 20;
var green:Shape = createCircle( 0x00FF00, 10 );
green.x = 15;
green.y = 25;
var blue:Shape = createCircle( 0x0000FF, 10 );
blue.x = 20;
blue.y = 20;
var container1:Sprite = new Sprite( );
container1.addChild( red );
container1.addChild( green );
container1.addChild( blue );
addChild( container1 );
var container2:Sprite = new Sprite( );
addChild( container2 );
container2.addChild( red );
}
public function createCircle( color:uint, radius:Number ):Shape {
var shape:Shape = new Shape( );
shape.graphics.beginFill( color );
shape.graphics.drawCircle( 0, 0, radius );
shape.graphics.endFill( );
return shape;
}
}
}
我把这段代码写到exemple.as中，测试exemple.fla时，exemple.swf中什么都不显示，我想知道，exemple.as与
exemple.fla中是如何建立关系的，殿堂之路中没有啊


------解决方案--------------------
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