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 ...

In Java, polymorphism results in code that is more concise and easier to maintain. This tutorial provides an overview of the four types of Java polymorphism, but our focus is subtype polymorphism.

Object fields of reference type point from one Java heap location to another. The target address of a Java reference is always the start of an object header (which is mandatory in current versions ...

double trouble = 99; char broiled = ‘a’; boolean flag = true; Primitive types represent the simplest, most direct way to represent data in code. Even the most complicated classes in Java can be ...

Constructors play a key role in all object-oriented programming languages, and Java is no exception. Every class a Java developer creates needs a constructor. Constructors perform numerous important ...