What you need to know about Java wrapper classes

"Java wrapper classes enable seamless integration of primitive data types with object-oriented structures, allowing usage in collections, handling nulls, and supporting generics."

"Wrapper classes are immutable and final, created to wrap primitive values in objects, and each primitive type corresponds to a specific wrapper class."

Wrapper classes in Java allow primitive data types to integrate with object-oriented programming, enabling their use in collections and handling nulls. Introduced in Java 1.0, these classes have evolved significantly, with Java 5 adding autoboxing and unboxing, and Java 21 further enhancing their capabilities. Wrapper classes are immutable and final, providing utility methods for type conversion and consistent data handling. They play a crucial role in modern Java features like pattern matching and generics, ensuring smooth interaction between primitives and objects.

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