检查Java中的内存布局 [英] Examining memory layout in Java

问题描述

我正在尝试继承，并且出于教育目的，我想检查为各种对象分配的地址以及该对象内的字段.有没有一种工具可以让我看到JVM正在使用什么内存以及它在做什么?

I am experimenting with inheritance and for educational purposes want to examine the addresses allocated for various objects and the fields within the object. Is there a tool which will let me see what memory the JVM is using and what it is using it for.

例如，如果我有两个班级:

For example if I have two classes:

class A { int i,j; int f { ...} }
class B extends A { int c; /* more methods, overriding f and declaring new ones as well */ }

并在对象a和b中实例化这些类.

and instantiate these classes in objects a and b.

是否可以使用一个工具来分析内存使用情况，并准确查看为这些内存分配了什么内存?

Is there a tool I can use to profile the memory usage and see exactly what memory is allocated for these?

谢谢！

推荐答案

我想首先了解一下JVM在某些操作系统上的功能是很有帮助的，所以请看一下 https://softwareengineering.stackexchange.com/questions/151076/approaching- java-jvm-internals

I guess is instructive first to have an image about how function JVM over some operating system, so take a look on The Java Virtual Machine. Also, a related question is https://softwareengineering.stackexchange.com/questions/151076/approaching-java-jvm-internals

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