如果超类已经做到了，子类是否需要显式重写Clone（）方法？ [英] Does subclass need to override Clone() method explicitly if superclass has already done it

问题描述

如果类A扩展了类B，并且类B已经实现了可克隆的接口，则类A是否必须声明'clone（）throws CloneNotSupportedException'。

If Class A extends class B and class B has already implemented cloneable interface then is it necessary for class A to declare 'clone() throws CloneNotSupportedException' .

I猜测它应该不是强制性的，因为克隆类A的对象的属性将自动从类B继承。

I guess it should not be mandatory, as property to clone Objects of class A would automatically be inherited from Class B.

推荐答案

如果类B定义了非原始可变成员字段，则必须覆盖 clone（）。需要在 B.clone（）中明确复制这些内容。如果B仅包含原始和/或不可变的数据成员，则 A.clone（）将完成该工作。

It is necessary to override clone() if class B defines non-primitve mutable member fields. These need to be deep copied explicitly within B.clone(). If B only contains primitive and/or immutable data members, A.clone() will do the job.

有关更详细的说明，请参见我的早期答案一个类似的问题。

For a more detailed explanation, see this earlier answer of mine to a similar question.

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