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stack and heap

 
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我觉得是根据应用方式本身特性 才将内存分区的,目的是提高效率方便管理

栈的特点是容量小,速度快,可能昂贵,就适合放置静态,全局等小且需要经常访问但不怎么变化的数据
堆的特点是容量大,速度慢,可能便宜,就适合放置动态分配的数据,因为动态分配的数据不确定且容量大,数量多,比如对象,生存期相对较短,就以无序状态存储于堆中。

像方法区之类是堆的一部分,我觉得更多是因为业务逻辑上便于分类管理的需要而应运而生的

详细可看:
http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html

http://www.maxi-pedia.com/what+is+heap+and+stack

 

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