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ArrayList is an implementation of List, backed by an array. All optional
operations including adding
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A Map is a data structure consisting of a set of keys and values in which each
key is mapped to a si
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A PriorityQueue holds elements on a priority heap, which orders the elements
according to their natu
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
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Operations on java.lang.String that arenull safe.
* IsEmpty/IsBlank - checks if a String contains
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