String, StringBuffer, StringBuilder and all wrapper classes are final classes. ----- in addition to String object all wrapper class objects also immutable in java. some times Void class is also ...

Wrapper classes in Java convert primitive data types into objects. They are useful when working with Collections, Streams, Generics, and APIs that require objects instead of primitives ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...