????Java????????????????Щ???????????????????????????Java????????????????

????????飺final??finally??finalize??

???????????final??finally??Java?????е?????????????????????????????????“??”?????“??”?????????????????ε????????У?????String??Math?????????ε???????????????????????????????????????????ε???????÷????????????????????????????????У?????????????????????????????????????????У????????????????????????????finalize??Object?????????finalize()??????????????????????????GC?????????????????????????????????????????????????Object???????е????????????????????finalize()????????????????????÷??????????????????????????????????

????????飺Collections??Collection??

??????????????Collections??Collection??????java.util?????????????????????????Collection???в??????????Collection????????????????????????????????????????List??Set???????????

?????????飺????????????

??????????????????????????????????????????????????????????????????????????????????????????????????????н?????????????????ж????????????????????磬???????

?????????飺???????????

?????????????????????????????????????????????檔?????abstract???ε?????????????????????????????????????????????????????????????????????

?????????飺Vector??ArrayList??LinkList??

???????????Vectot??ArrayList????????鷽???洢????????????????????????????????????????????Vector??????????????????????????????????????????ArrayList????????????????????????????LinkList???????????洢????????????????????????Щ??Ч??

?????????飺Hashtable??HashMap??

????????????????????????Map?????????key????????value?????????????1??HashMap??????????????null??????null?????Hashtable???????2??HashMap??Hashtable??contains??????????????containsValue()??containsKey()??????3??Hashtable?????Dictionary??HashMap??Java1.2??????Map????????4??Hashtable???????????????HashMap??????????

?????????飺wait()??sleep()??notify()??notifyAll()??

???????????wait()??Object?????????????????????????notify()??notify()??????????μ?????????sleep()??Thread??????????????????????????????е??????????????У???notify()??notifyAll()????Object????????????????????????????????????????????????????????????????????????

?????????λ“????”????????????л???????????????????