摘要： 一些文章在分析GC时，不可逾越的说到要先从根对象扫描出不可达对象，然后标记那些不可达对象为垃圾。那么源头根对象是什么玩意呢？几分钟后google到比较可信源是http://stackoverflow.com/questions/8458886/what-is-a-rooted-reference。其解释具体为：GC roots are not objects in themselves but are instead references to objects. Any object referenced by a GC root will automatically survive the 阅读全文