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Tip: Java Collections Performance, MAP

Improve Java performance with MAP.




Building the Right Environment to Support AI, Machine Learning and Deep Learning

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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