interface Playable {

   void play();

}

interface Bounceable {
    void play();
}
interface Rollable extends Playable, Bounceable {

    Ball ball = new Ball("PingPang");

}


    class Ball implements Rollable {

    private String name;

        public String getName() {

        return name;



    }

   public Ball(String name) {
        this.name = name;        
    }
        public void play() {

        ball = new Ball("Football");
        System.out.println(ball.getName());

  }

}

指出上面的程序错误的地方，说明原因。

这是测试题目么？ 我想说在ball = new Ball(“Football”) 前面少个类名Ball