Lesson: Classes and Objects
With the knowledge you now have of the basics of the Java programming language, you can learn to write your own classes. In this lesson, you will find information about defining your own classes, including declaring member variables, methods, and constructors.
You will learn to use your classes to create objects, and how to use the objects you create.
This lesson also covers nesting classes within other classes, and enumerations
This section shows you the anatomy of a class, and how to declare fields, methods, and constructors.
This section covers creating and using objects. You will learn how to instantiate an object, and, once instantiated, how to use the
dot operator to access the object's instance variables and methods.
This section covers more aspects of classes that depend on using object references and the
dot operator that you learned about in the preceding section: returning values from methods, the
this keyword, class vs. instance members, and access control.
Static nested classes, inner classes, anonymous inner classes, local classes, and lambda expressions are covered. There is also a discussion on when to use which approach.
This section covers enumerations, specialized classes that allow you to define and use sets of constants.