共享常量池? [英] Shared Constant Pool?

问题描述

与Java虚拟机相比，Dalvik虚拟机获得共享常量池"是什么意思?

What does it mean when the Dalvik Virtual Machine got a "Shared Constant Pool" compared to the Java Virtual Machine?

这有什么好处?达尔维克机器如何实现这一目标?

How is this a benefit and how does the Dalvik Machine achieve this?

推荐答案

Java虚拟机将每个类存储在一个单独的.class文件中.每个类文件都有一个常量池，用于存储诸如字符串，方法名，类名等之类的内容.如果多个类引用相同的字符串，则每个类文件将在其常量池中具有该字符串的副本.

The Java virtual machine stores each class in an individual .class file. Each class file has a constant pool for things like strings, method names, class names, etc. If multiple classes reference the same string, then each class file will have a copy of that string in its constant pool.

Dalvik虚拟机将多个类存储在单个dex文件中，并具有单个常量池.因此，如果多个类引用相同的字符串，则该dex文件的全局"常量池中将只有该字符串的一个副本.

The Dalvik virtual machine stores multiple classes in a single dex file, with a single constant pool. So if multiple classes reference the same string, there will only be one copy of that string in the "global" constant pool for that dex file.

好处是它具有更高的空间利用率，并且由于dalvik内存将这些dex文件映射到内存中，因此它也具有更高的内存效率.

The benefit is that it is more space efficient, and since dalvik memory maps these dex files into memory, it is also more memory efficient.

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