Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.

Depending upon the use case, you can leave the content in the HashSet and use that component to keep the data set unique. You could also use the List.of method to hold the HashSet elements in a List ...

Take advantage of high-performance HashSet collections for storing unique elements to speed up searches in your applications.

The use of the Java Streams API to find duplicates. The use of the frequency method in Java’s Collections class. Brute-force Java duplicate finder A brute-force approach to solve this problem involves ...