package
{
public class Single
{
private static var _boolean:Boolean=true;//控制开始就创建一个单例
private static var _single:Single;
public function Single():void
{
if(_boolean)
{
throw new Error("--------");
}
}
public static function getInstance():Single
{
if(_single ==null)
{
_boolean=false;
_single=new Single();
_boolean=true;
}
return _single;
}
}
}

这个应该是父类