Would any one tell me how to use java.lang.ref.*

Hello!
I am a recruit. I need to write something with java.lang.ref.
I can't understand the description in API of J2SE very well. Would any one tell me where could I get some more detail or tutorial or example?
Thanks!
wooing

check it out
http://developer.java.sun.com/developer/technicalArticles/ALT/RefObj/

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