6-10编程练习报错？？？？？

源自：Java多态 6-10 编程练习

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2回答

好帮手慕雪 2018-08-20 18:24:00

BallTest.java中的第26行，写错了 Ball.play() ,应该是ball.play()

提问者慕羲 #1

BallTest.java:2: error: BallTest is not abstract and does not override abstract method play() in Ball class BallTest implements Ball{ ^ 1 error

2018-08-20 19:25:54
irista23 回复提问者慕羲 #2

实现Ball接口的是Inner_m，不是BallTest类，否则需要在BallTest类中重写play()方法。

2018-08-21 09:32:00
irista23 回复提问者慕羲 #3

Inner_f也需要实现Ball接口方法

2018-08-21 09:32:53

好帮手慕雪 2018-08-20 17:52:49

错误信息呢？

提问者慕羲 #1

BallTest.java:2: error: BallTest is not abstract and does not override abstract method play() in Ball public class BallTest implements Ball{ ^ BallTest.java:26: error: non-static method play() cannot be referenced from a static context Ball.play(); ^ 2 errors

2018-08-20 18:10:33