From : http://java.boot.by/scjp-tiger/
Given a scenario, write code that makes appropriate use of object locking to protect static or instance variables from concurrent access problems.
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Given a scenario, write code that makes appropriate use of object locking to protect static or instance variables from concurrent access problems.

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Recognize the states in which a thread can exist, and identify ways in which a thread can transition from one state to another.  Home  Given a scenario, write code that makes appropriate use of wait, notify, or notifyAll.