java中引用变量的大小是多少 [英] what is the size of reference variable in java

问题描述

java中引用变量的大小是多少？我很确定它不会依赖于架构，不是吗？它与C中指针的概念有什么相似之处吗？我有尝试，但无法得到任何令人信服的答案。

What is the size of reference variables in java? I am quite sure it wont be dependent upon the architecture or is it? Does it bear any resemblance with concept of pointers in C? I have tries but could not get any convincing answer.

推荐答案

引用使用的内存量取决于几个参数：

The amount of memory used by a reference depends on several parameters:

• 在32位JVM上，在64位JVM上为32位


• ，它可以是32位或64位，具体取决于配置。例如，在热点上，默认情况下会激活压缩的普通对象指针和参考的大小是32位。如果您使用 -XX：-UseCompressedOops 停用该选项，它们将使用64位。

• on a 32-bit JVM, it will be 32 bits
• on a 64-bit JVM, it can be 32 or 64 bits depending on configuration. On hotspot for example, compressed ordinary object pointers is activated by default and the size of a reference is 32 bits. If you deactivate the option with -XX:-UseCompressedOops, they will use 64 bits.

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