java - 新关键字的副作用

Question

有人说 new 关键字有副作用是什么意思？在 SSE , 给出了答案的评论，但我没有理解评论。

Clearly the factory methods in the question call new, they have side effects. However, that side effect is identical to just calling a public constructor, so they are no more difficult to test than the latter.

问题与使用静态方法构造具有私有(private)构造函数的对象有关。使用 new 关键字有什么副作用？我应该如何创建我的对象？

Answer 1

full comment是:

Clearly the factory methods in the question call new, they have side effects. However, that side effect is identical to just calling a public constructor, so they are no more difficult to test than the latter.

他是说副作用是创建了一个新的对象；但是在静态工厂方法中调用 new 的副作用与直接调用 new 没有区别。