Handy utilities for things I wish were in Java's collections api.

• Delegating collections
• Observable collections
• Invertible Map (BiMap)
• Boxes
  • Object T
  • int
  • long
  • float
  • double
  • char
• Trees
  • Treated as additions to Map<K, Tree<K,V>>
• Tuples
  • Pair
• Lambdas that throw Throwable
• Common utilities for List, Map, and Set types with features such as:
  • Creating singleton collections
  • Creating disjoint & intersection collection of two input collections