en soldes these objects will never be recovered.2

The collection offers many practical data structure.If you are familiar with C + + STL, will be much easier to contact Java collection en soldes, C + + STL is complex and inefficient.Object reference intensity is divided into four levels: in the java.
lang.ref 1 strong reference: when the memory is insufficient, these objects will never be recovered.2: when the soft reference memory when, can reclaim the object memory, used to implement memory cache sensitive to tell.
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