Introduction to Programming

Constructors

An object is an instance of a class used as the template for object creation. Each object is defined by its state and behavior. The object's state is defined by the values of its fields (also called properties), the object behavior by its methods. Since all Java objects are descendants of java.lang.Object, it is not possible to have an object without state and behavior because every object inherits its methods and some basic state from java.lang.Object. But when we talk about application code, classes, and objects this code creates, we mean the methods and state we define in order to build the functionality we want. In this sense, it is possible to have an object without methods. Such objects are usually called data objects, ...