New Collection APIs in Java-6!!

New interfaces:

• Deque
• BlockingDeque
• NavigableSet  
• NavigableMap

 New Classes

• ArrayDeque
• LinkedBlockingDeque
• ConcurrentSkipListSet
• ConcurrentSkipListMap
• AbstractMap.SimpleEntry
• AbstractMap.SimpleImmutableEntry

Updated classes of java 6

• LinkedList
• TreeSet  
• TreeMap
• Collections

Classes are modified to implement the new interfaces in the existing classes.LinkedList is modified to implement Deque. TreeSet is modified to implement NavigableSet.TreeMap is modified to implement NavigableMap.In Collections 2 new methods newSetFromMap and asLifoQueue are added.