Immutable Collections Factory Methods: List.of, Set.of, Map.of
Immutable collections factory methods List.of(), Set.of() and Map.of() in Java 25, with null and duplicate rules, copyOf(), toList() and Arrays.asList().
Why Strings Are Immutable in Java: Reasons and Examples
Learn why Strings are immutable in Java, how the final String class enforces it, and how the string pool, hash caching, threads and security depend on it.
Immutable Class in Java: Rules, Examples and Records
Learn how to create an immutable class in Java with final fields, defensive copies and List.copyOf(), plus records, unmodifiable views and thread safety.