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Tip: Java Collections Performance, MAP

Improve Java performance with MAP.


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Improve Java performance with MAP.

              
                                 Add      Contains keys       Next           Data Structure
HashMap                          O(1)          O(1)            O(h/n)          Hash Table
EnumMap                          O(1)          O(1)            O(1)            Array
LinkedHashMap                    O(1)          O(1)            O(1)            Hash Table+Linked List
TreeMap                          O(log n)      O(log n)        O(log n)        Red-black tree
ConcurrentSkipListMap            O(log n)      O(log n)        O(1)            Skip List
ConcurrentHashMap                O(1)          O(1)            O(h/n)          Hash table
IdentityHashMap                  O(1)          O(1)            O(h/n)          Array
WeakHashMap                      O(1)          O(1)            O(h/n)          Hash table

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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