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【单选题】
在Java中,以下关于方法重载和方法重定义描述正确的是?A.
方法重载和方法的重定义实现的功能相同
B.
方法重载出现在父子关系中，方法重定义是在同一类中
C.
方法重载的返回值类型必须一致，参数项必须不同
D.
方法重定义的返回值类型必须相同或相容。
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