Java Wrapper Classes: Autoboxing, Unboxing and Pitfalls
Java wrapper classes explained with autoboxing and unboxing, valueOf() vs parseInt(), the Integer cache, == and null pitfalls, and examples on Java 25.
Integer Cache in Java: Wrapper Class Caching (-128 to 127)
How the Integer cache in Java works, why 127 == 127 but 128 does not, cache ranges of all wrapper classes, AutoBoxCacheMax and the equals() fix.