内存分配：Java中引用占用了多少空间？ [英] Memory allocation : How much space does a reference occupy in Java?

问题描述

在Java中我们编写了一个代码：

In Java we have written a code:

A a1;
a1 = new A();

编译器编译代码时保留多少字节的内存：

How many bytes of memory is reserved when compiler compiles the code:

A a1;

推荐答案

这是Java标准没有规定的，因此你应该不用担心。

That's not specified by the Java standard and thus you should not worry about it.

从技术上讲，引用通常与机器的字大小一样大，即32位机器上的32位和64位机器上的64位，尽管有些64位JVM使用特殊魔法允许32位引用。

Technically, references are usually as big as the machine's word size, i.e. 32 bit on a 32 bit machine and 64 bit on a 64 bit machine, though some 64 bit JVMs use special magic to allow 32 bit references.

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