如何访问类的私有构造函数？ [英] How can I access a private constructor of a class?

问题描述

我是一名Java开发人员。在一次采访中，我被问到私人构造函数的问题：

你能访问一个类的私有构造函数并实例化它吗？ >

我回答不，但是错了。

解决方案

• 您可以访问它


• 如果是嵌套类，则可以从封闭类中访问它






这不是真的清楚，如果这些都适用 - 你能提供更多的信息吗？




I am a Java developer. In an interview I was asked a question about private constructors:

Can you access a private constructor of a class and instantiate it?

I answered 'No' but was wrong.

Can you explain why I was wrong and give an example of instantiating an object with a private constructor?

解决方案

• You can access it within the class itself (e.g. in a public static factory method)
• If it's a nested class, you can access it from the enclosing class
• Subject to appropriate permissions, you can access it with reflection

It's not really clear if any of these apply though - can you give more information?

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