How to Get Index of an Item in Java Set

Date: 2024-02-12

Java Sets, unlike Lists, don't have an indexOf() method because they are unordered collections of unique elements. Attempting to find an element by index directly is impossible. The article explores workarounds: a custom getIndexInSet() method iterating through the Set, a custom IndexedLinkedHashSet class, and using Apache Commons Collections' ListUtils.indexOf() method (treating the Set as a List). The contains() method is the most efficient way to check for an element's existence.

Read more: https://examples.javacodegeeks.com/find-java-set-element-by-index/