Java provides HashSet and TreeSet implementations. For maps, you have the choice between HashMap and TreeMap implementations. A LinkedHashMap retains insertion order.

Understanding the Internal Working of HashMap in Java Java’s HashMap is a highly efficient data structure used for storing key-value pairs. It is part of Java’s java.util package and is widely used in ...

Java Collections Framework provides a set of interfaces and classes to store and manipulate groups of objects. Collections make it easier to work with groups of objects, such as lists, sets, and maps.

This module takes you on an extended tour of the Collections Framework, first introduced with the Java 2 platform, Standard Edition, version 1.2. The Collections Framework provides a well-designed set ...

Proposal for enhancing the Java programming language would define interfaces for sequenced collections, sequenced sets, and sequenced maps.