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Composition offers more benefits as compared to the previous solution, although at the cost of a slight performance penalty (refer to [OBJ01OBJ07-J. Understand how a superclass can affect a subclass] for details on how to implement composition). This allows the {{CompositeCollection}} class to use its own intrinsic lock in a way that is completely independent of the lock of the underlying list class. This provides consistent locking even when the underlying list is not thread-safe or when it changes its locking policy. \[[Goetz 06|AA. Java References#Goetz 06]\] |
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