java - 复制构造函数 v. 实现 Cloneable 接口(interface)

Question

就“最佳实践”而言，哪种方法更适合创建对象的“深拷贝”？

Answer 1

使用复制构造函数。 Cloneable 是一个直接的 API 灾难。参见 Effective Java Item 10 (Item 11 in the 2nd. ed.)。

Item 11: Override clone judiciously

The Cloneable interface was intended as a mixin interface (item 18) for objects to advertise that they permit cloning. Unfortunately, it fails to serve this purpose. Its primary flaw is that it lacks a clone method, and Object's clone method is protected. You cannot, without resorting to reflection (Item 53), invoke the clone method on an object merely because it implements Cloneable. Even a reflective invocation may fail, as there is no guarantee that the object has an accessible clone method.