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 ...

You can start creating methods in the Service class now that you have the underlying enumeration and structure. The Service class is on the designer already, so you can start adding methods to it. The ...

This method is used by hash-based Java collection classes, such as the java.util package’s HashMap, HashSet, and Hashtable classes to ensure that objects are properly stored and retrieved.

Objects should be declared either as generic objects (with the OBJECT keyword) or as specific class objects. You can use dot notation with an object only if it is declared as an object. Using specific ...