Java中的指针和引用变量有什么区别？ [英] What is the difference between a pointer and a reference variable in Java?

问题描述

我的Java书解释说，要使用对象，我们可以将它们分配给引用变量。这与指向对象的指针有什么不同？ Java有指针吗？

My Java book explains that to use objects, we can assign them to reference variables. How is that different from a pointer to an object? Does Java have pointers?

谢谢：）

推荐答案

参考有点像指针，你不能做算术...虽然它更不透明。虽然底层位可能是虚拟内存中的地址，但它们不一定是。它们只是获取对象（或表示空值）的一种方式。因此，虽然它们并不完全相同，但如果您习惯将指针视为识别对象或导航到它的方式（在某种意义上），那么是的，这些想法也适用于引用。

A reference is sort of like a pointer that you can't do arithmetic on... although it's more opaque. While the underlying bits may be an address in virtual memory, they don't have to be. They're just a way of getting to an object (or representing the null value). So while they're not exactly the same, if you're used to thinking of a pointer as "a way of identifying an object or navigating to it" (in some sense) then yes, those thoughts apply to references too.

Java没有这样的指针（不像C＃，它有引用和指针 - 后者用于不安全代码） 。

Java doesn't have pointers as such (unlike, say, C# which has references and pointers - the latter being used in "unsafe" code).

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