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

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 ...

Java records are a new language feature that reduces verbosity and enables optimized runtime performance. This Java records tutorial shows how they work.