gc即垃圾收集机制是指jvm用于释放那些不再使用的对象所占用的内存。java语言并不要求jvm有gc，也没有规定gc如何工作。不过常用的jvm都有gc，而且大多数gc都使用类似的算法管理内存和执行收集操作

Packet : Java的垃圾回收机制详解和调优.doc filelist

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