何时使用包装类和原始类型 [英] When to use wrapper class and primitive type

问题描述

什么时候我应该选择包装类而不是原始类型?或者在什么情况下我应该在包装器/原始类型之间进行选择?

When I should go for wrapper class over primitive types? Or On what circumstance I should choose between wrapper / Primitive types?

推荐答案

其他人提到某些结构(例如 Collections).

Others have mentioned that certain constructs such as Collections require objects and that objects have more overhead than their primitive counterparts (memory & boxing).

另一个考虑是:

将对象初始化为 null 或将 null 参数发送到方法/构造函数以指示状态或函数会很方便.使用原语无法做到这一点.

It can be handy to initialize Objects to null or send null parameters into a method/constructor to indicate state or function. This can't be done with primitives.

许多程序员将数字初始化为 0(默认值)或 -1 来表示这一点，但根据具体情况，这可能是不正确的或误导性的.

Many programmers initialize numbers to 0 (default) or -1 to signify this, but depending on the scenario, this may be incorrect or misleading.

当某些东西被错误使用时，这也会为 NullPointerException 设置场景，这比一些任意的错误更适合程序员.

This will also set the scene for a NullPointerException when something is being used incorrectly, which is much more programmer-friendly than some arbitrary bug down the line.

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