Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

Polymorphism is one of the fundamental concepts in Object-Oriented Programming (OOP). It refers to the ability of a function, method, or object to take on multiple forms. Polymorphism in Java is ...

Method overloading in Java. ... or it could be widened into an Object. (Remember that every class in Java extends the Object class.) In that case, the JVM chooses to wided the ...

Just as primitive data values can be returned from methods, objects can also be returned. When an object is returned from a method, it's actually the reference (or address) of the object that is being ...