java - 为什么自动装箱在数组中不起作用？

Question

我不明白为什么这段代码没有编译:

 Object[] arr = new int[3];

我不需要此代码即可工作。我只想了解自动装箱在这种情况下不起作用的原因？

Answer 1

来自 this回答Why do we use autoboxing and unboxing in Java? , 我会引用您要回答的问题的相关详细信息:

Primitive variables aren't interchangeable in the same way, neither with each other, nor with Object. The most obvious reason for this (but not the only reason) is their size difference. This makes primitive types inconvenient in this respect, but we still need them in the language (for reasons that mainly boil down to performance).

因此，另一方面，适合您的是:

Object[] arr = new Integer[3];