JAVA多态示例

这多态，我觉得是最利害的。在开发大型程序中。

但，也是需要经过足够多的实践经验才能随心利用的。

class Quadrangle{

    private Quadrangle[] qtest = new Quadrangle[6];

    private int nextIndex = 0;

    public void draw(Quadrangle q){

        if(nextIndex < qtest.length){

            qtest[nextIndex] = q;

            System.out.println(nextIndex);

            nextIndex++;

        }

    }

    public static void main(String[] args){

        Quadrangle q = new Quadrangle();

        q.draw(new Square());

        q.draw(new Parallelogram());

    }

}

class Square extends Quadrangle{

    public Square(){

    System.out.println("this is a Square class.");

    }

}

class Parallelogram extends Quadrangle{

    public Parallelogram(){

    System.out.println("this is a Parallelogram class.");

    }

}

this is a Square class.
0
this is a Parallelogram class.
1

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