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HomeJavajavaTutorialHow do the Big-O complexities of Java Collection Framework implementations impact performance?

How do the Big-O complexities of Java Collection Framework implementations impact performance?

Java Collections Framework: A Comprehensive Guide to Big-O Implementations

In the Java Collections Framework, each collection has its distinct performance characteristics determined by its underlying data structure. Understanding the Big-O complexities of these operations can guide effective selection and optimization of data structures.

List Implementations

Operation ArrayList LinkedList CopyOnWrite-ArrayList
get O(1) O(n) O(1)
add O(1) O(1) O(n)
contains O(n) O(n) O(n)
next O(1) O(1) O(1)
remove(0) O(n) O(1) O(n)
iterator.remove O(n) O(1) O(n)

Set Implementations

Operation HashSet LinkedHashSet CopyOnWriteArraySet EnumSet TreeSet ConcurrentSkipListSet
add O(1) O(1) O(n) O(1) O(log n) O(log n)
contains O(1) O(1) O(n) O(1) O(log n) O(log n)
next O(h/n) O(1) O(1) O(1) O(log n) O(1)

Map Implementations

Operation HashMap LinkedHashMap IdentityHashMap EnumMap TreeMap ConcurrentHashMap ConcurrentSkipListMap
get O(1) O(1) O(1) O(1) O(log n) O(1) O(log n)
containsKey O(1) O(1) O(1) O(1) O(log n) O(1) O(log n)
next O(h/n) O(1) O(h/n) O(1) O(log n) O(h/n) O(1)

Queue Implementations

Operation PriorityQueue ConcurrentLinkedQueue ArrayBlockingQueue LinkedBlockingQueue PriorityBlockingQueue DelayQueue LinkedList ArrayDeque LinkedBlockingDeque
offer O(log n) O(1) O(1) O(1) O(log n) O(log n) O(1) O(1) O(1)
peek O(1) O(1) O(1) O(1) O(1) O(1) O(1) O(1) O(1)
poll O(log n) O(1) O(1) O(1) O(log n) O(log n) O(1) O(1) O(1)
size O(1) O(n) O(1) O(1) O(1) O(1) O(1) O(1) O(1)

Additional Resources

  • [Java Generics and Collections](https://www.apress.com/gp/book/9781430214919)
  • [Collections Overview](https://docs.oracle.com/javase/8/docs/api/java/util/package-summary.html)
  • [Annotated Outline](https://docs.oracle.com/javase/8/docs/api/java/util/package-tree.html)

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