Java 101: Classes and objects in Java

Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This tutorial teaches you how to declare classes, describe attributes via fields, describe behaviors via methods, initialize objects via constructors, and instantiate objects from classes and access their members. Along the way, you’ll also learn about setters and getters, method overloading, setting access levels for fields, constructors, and methods, and more. Note that code examples in this tutorial compile and run under Java 12.