Java For Everyone Ep.8 - Java Map and HashMap

Welcome back to Java For Everyone! In Episode 7, we are diving deep into the Java Collection Framework. This is a jam-packed session where we move beyond simple ArrayLists and explore different ways to iterate, store unique elements, and utilize the factory methods introduced in Java 9. By the end of this video, you will have a solid understanding of when to use a List vs. a Set, how to traverse backwards using ListIterator, and how to write cleaner code with the List.of() and Set.of() methods. 📌 What You Will Learn in This Episode: ListIterator: How to traverse a list both forward and backward, and how to modify elements during iteration. forEach: The difference between a standard for-each loop and the forEach() method (Internal vs External Iteration). Java Set Interface: Understanding the mathematical concept of a Set and why duplicates are not allowed. HashSet Implementation: How HashSet works under the hood (hashing) and its performance benefits. Java 9 Factory Methods: How to create immutable Lists and Sets using List.of() and Set.of() (and the "gotchas" you need to watch out for). #java #coding #datastructures #algorithms #kenyajavausergroups