本文通过创建四个类（MyShape、MyCircle、MySquare 和 TestShape）来演示 AS3 中的多态性。MyShape 类作为基类，包含一个 drawShape 方法；MyCircle 和 MySquare 分别继承自 MyShape 并重写了该方法。TestShape 类用于实例化子类并调用 drawShape 方法。
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。
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。
扫一扫
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
