title: "java问题"
date: 2018-05-14T07:00:00+08:00
draft: false
tags:
- RDDL
categories: - 技术
- 归档
[TOC]
学习过程中遇到的一些技术问题。
String interning
String interning keeps every String only once in memory.
https://en.wikipedia.org/wiki/String_interning
关于java程序种的内存
Total designated memory, this will equal the configured -Xmx value:
Runtime.getRuntime().maxMemory();
Current allocated free memory, is the current allocated space ready for new objects. Caution this is not the total free available memory:
Runtime.getRuntime().freeMemory();
Total allocated memory, is the total allocated space reserved for the java process:
Runtime.getRuntime().totalMemory();
Used memory, has to be calculated:
usedMemory = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
Total free memory, has to be calculated:
freeMemory = Runtime.getRuntime().maxMemory() - usedMemory;
如图所示:
Image_584
参考链接:
https://stackoverflow.com/questions/3571203/what-are-runtime-getruntime-totalmemory-and-freememory
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