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 ...

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 ...

In Constructors -- Level One, the DDATA class implicitly extended OBJECT.CLASS. In fact, any class without an explicit EXTENDS clause in the CLASS statement extends OBJECT.CLASS. To explicitly extend ...