Java Collections Performance, MAP

Improve Java performance with MAP.

                                               Add      Contains keys       Next           Data StructureHashMap                          O(1)          O(1)            O(h/n)          Hash TableEnumMap                          O(1)          O(1)            O(1)            ArrayLinkedHashMap                    O(1)          O(1)            O(1)            Hash Table+Linked ListTreeMap                          O(log n)      O(log n)        O(log n)        Red-black treeConcurrentSkipListMap            O(log n)      O(log n)        O(1)            Skip ListConcurrentHashMap                O(1)          O(1)            O(h/n)          Hash tableIdentityHashMap                  O(1)          O(1)            O(h/n)          ArrayWeakHashMap                      O(1)          O(1)            O(h/n)          Hash table
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