Data structures missing from the Java APIs. Includes:

• Array views - wrappers which expose an array (or pair of arrays in the case of ArrayMapView) as a List implementation, see:
  • ArrayMapView and constructor class ArrayMapViewHandle
  • ArrayView and constructor class ArrayViewHandle
• Bag - unordered list with O(1) index removal performance, see:
  • Bag
  • MultiBag - treat a single internal array as multiple sub-lists
• BiTypeList - a list containing two data element types with strongly typed access to elements in the list
• Pair collections - non-unique maps, with list, sorted list, and bag implementations, see:
  • PairBag
  • PairList
  • SortedPairList
• Circular buffers - see:
  • CircularArray
  • CircularByteArray
• ByteBufferArray - Combines the ability to resize a ByteArrayOutputStream with the indexed position access of a ByteBuffer and the read/write methods of a DataOutput stream
• SimpleByteBuffer - A container for a data array, offset, and length, with methods for adjusting the offset and length. The call must manually handle the data.
• FrequencyMap - for tracking and incrementing/decrementing occurrences of distinct key values
• PropertyMap - for easily loading and saving Java '.properties' files and automatically parsing boolean, int, float, hexadecimal int, String, Color, File, and Path properties.

Take a look at the unit tests in twg2.collections.util.tests package for examples of how the APIs can be used.