Once compare
has been called, the FixedOrderComparator is locked and attempts to modify it yield an UnsupportedOperationException.
Instances of FixedOrderComparator are not synchronized. The class is not thread-safe at construction time, but it is thread-safe to perform multiple comparisons after all the setup operations are complete.
This class is Serializable from Commons Collections 4.0. @since 3.0 @version $Id: FixedOrderComparator.java 1479344 2013-05-05 15:48:01Z tn $
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