From : http://java.boot.by/scjp-tiger/
Determine the effect upon object references and primitive values when they are passed into methods that perform assignments or other modifying operations on the parameters.
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Determine the effect upon object references and primitive values when they are passed into methods that perform assignments or other modifying operations on the parameters.

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Given an example of a class and a command-line, determine the expected runtime behavior.  Home  Given a code example, recognize the point at which an object becomes eligible for garbage collection, and determine what is and is not guaranteed by the garbage collection system. Recognize the behaviors of System.gc and finalization.