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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

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     Commons-Collections contains implementations, enhancements and utilities
     that complement the Java Collections Framework.
  
  
     The Apache Commons Collections Framework component adds a significant
     amount of enhancements to the standard JDK collections. These enhancements
     come in the form of new interfaces, new implementations and utility classes.
  
  
     See also the {@code java.util} package for the standard Java collections.
  
     
  Main features
  
     Commons-Collections defines a number of key interfaces:
  
  
  
    Interface Description
  
  
    
      {@link org.apache.commons.collections.Bag}
    
    
      A new {@code Collection} subinterface that stores each object together
      with the number of occurrences. Methods are provided to get the number of
      occurrences, and to add and remove a certain number of that object.
    
  
  
    
      {@link org.apache.commons.collections.Buffer}
    
    
      A new {@code Collection} subinterface that allows objects to be removed
      in some well-defined order. Methods enable the next item to be peeked and removed.
    
  
  
    
      {@link org.apache.commons.collections.BidiMap}
    
    
      A new {@code Map} subinterface that allows lookup from key to value and
      from value to key with equal ease.
    
  
  
    
      {@link org.apache.commons.collections.OrderedMap}
    
    
      A new {@code Map} subinterface that is used when a map has an order, but is
      not sorted. Methods enable bidirectional iteration through the map.
    
  
  
    
      {@link org.apache.commons.collections.MapIterator}
    
    
      A new {@code Iterator} subinterface specially designed for maps. This iterator
      avoids the need for entrySet iteration of a map, and is simpler to use.
    
  
  
    
      {@link org.apache.commons.collections.ResettableIterator}
    
    
      A new {@code Iterator} subinterface that allows the iteration to be reset back
      to the start. Many iterators in this library have this functionality.
    
  
  
    
      {@link org.apache.commons.collections.Closure}

      {@link org.apache.commons.collections.Predicate}

      {@link org.apache.commons.collections.Transformer}

      {@link org.apache.commons.collections.Factory}

    
    
      A group of functor interfaces that provide plugin behavior to various
      collections and utilities.
    
  
  
  
     In addition to the interfaces, there are many implementations.
     Consult each subpackage for full details of these.

Interface	Description
{@link org.apache.commons.collections.Bag}	A new {@code Collection} subinterface that stores each object together with the number of occurrences. Methods are provided to get the number of occurrences, and to add and remove a certain number of that object.
{@link org.apache.commons.collections.Buffer}	A new {@code Collection} subinterface that allows objects to be removed in some well-defined order. Methods enable the next item to be peeked and removed.
{@link org.apache.commons.collections.BidiMap}	A new {@code Map} subinterface that allows lookup from key to value and from value to key with equal ease.
{@link org.apache.commons.collections.OrderedMap}	A new {@code Map} subinterface that is used when a map has an order, but is not sorted. Methods enable bidirectional iteration through the map.
{@link org.apache.commons.collections.MapIterator}	A new {@code Iterator} subinterface specially designed for maps. This iterator avoids the need for entrySet iteration of a map, and is simpler to use.
{@link org.apache.commons.collections.ResettableIterator}	A new {@code Iterator} subinterface that allows the iteration to be reset back to the start. Many iterators in this library have this functionality.
{@link org.apache.commons.collections.Closure} {@link org.apache.commons.collections.Predicate} {@link org.apache.commons.collections.Transformer} {@link org.apache.commons.collections.Factory}	A group of functor interfaces that provide plugin behavior to various collections and utilities.