垃圾回收时Java Map内容是否递归？

Question

I use a structure like the following:

HashMap < EnumA , HashMap < Integer , LinkedList < EnumB > > > OverallMap

If I were to do this:

OverallMap . clear ( )

Will everything that was discarded by the clear() (the HashMap objects, the Integer objects, and the LinkedList objects) eventually get garbage-collected, or do I have to iterate all the way down to the lists and call clear() on them before clear() ing the inner maps and then clear() ing the outer map?

Answer 1

只要没有其他引用其他对象，它们就会被垃圾回收。

Answer 2

您需要做的就是在顶层调用clear() ，除非在其他地方引用了这些集合，但是您只能在一个地方将其清除。

Answer 3

是的，如果您使用.clear（），则除了某些TotalMap内部结构外，所有内容都将被垃圾收集。