在类中将构造函数私有化有什么用? [英] What is the use of making constructor private in a class?

问题描述

我们为什么要在类中将构造函数设为私有?因为我们一直需要构造函数是公开的.

Why should we make the constructor private in class? As we always need the constructor to be public.

推荐答案

您可能需要私有构造函数的一些原因:

Some reasons where you may need private constructor:

1. 只能从类本身内部的静态工厂方法中访问构造函数. Singleton也可以属于此类别.
2. 实用程序类，仅包含静态方法.

1. The constructor can only be accessed from static factory method inside the class itself. Singleton can also belong to this category.
2. A utility class, that only contains static methods.

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