ActionScript 3 的多态性

 
测试一下AS3的多态性，准备四个类：MyShape，MyCircle，MyQuare，TestShape（测试类）
package
...{
    public class MyShape
    ...{
        public function drawShape():void...{
            trace("this is MyShape");
        }
    }
}package
...{
    public class MyCircle extends MyShape
    ...{
        override public function drawShape():void...{
            trace("this is MyCircle");
        }
    }
}package
...{
    public class MySquare extends MyShape
    ...{
        override public function drawShape():void...{
            trace("this is MySqure");
        }
    }
}package
...{
    import flash.display.Sprite;

    public class TestShape extends Sprite
    ...{
        public function TestShape()
        ...{
            newShape(new MyCircle());
        }
        public function newShape(myShape:MyShape):void...{
            myShape.drawShape();
        }
    }
}
输出结果为： "this is MyCircle"
实际应用中MyShape最好写成接口。

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/lixinye0123/archive/2007/08/24/1758128.aspx