Apache Commons - Alternative to Java collection

Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.

  • Bag interface for collections that have a number of copies of each object
  • Buffer interface for collections that have a well defined removal order, like FIFOs
  • BidiMap interface for maps that can be looked up from value to key as well and key to value
  • MapIterator interface to provide simple and quick iteration over maps
  • Type checking decorators to ensure that only instances of a certain type can be added
  • Transforming decorators that alter each object as it is added to the collection
  • Composite collections that make multiple collections look like one
  • Ordered maps and sets that retain the order elements are added in, including an LRU based map
  • Identity map that compares objects based on their identity (==) instead of the equals method
  • Reference map that allows keys and/or values to be garbage collected under close control
  • Many comparator implementations
  • Many iterator implementations
  • Adapter classes from array and enumerations to collections
  • Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure



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