Package
org.apache.commons.collections.set
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This package contains implementations of the Set and SortedSet interfaces.

The implementations are in the form of direct implementations and decorators. A decorator wraps another implementation of the interface to add some specific additional functionality.

The following implementations are provided in the package:

  • CompositeSet - a set that combines multiple sets into one
The following decorators are provided in the package:
  • Synchronized - synchronizes method access for multi-threaded environments
  • Unmodifiable - ensures the collection cannot be altered
  • Predicated - ensures that only elements that are valid according to a predicate can be added
  • Typed - ensures that only elements that are of a specific type can be added
  • Transformed - transforms each element added
  • ListOrdered - ensures that insertion order is retained
  • MapBackedSet - a set formed by decorating a Map
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