Trail: Learning the Java Language
Lesson: Classes and Objects
Classes and Objects
Classes
Declaring Classes
Declaring Member Variables
Defining Methods
Providing Constructors for Your Classes
Passing Information to a Method or a Constructor
Objects
Creating Objects
Using Objects
More on Classes
Returning a Value from a Method
Using the this Keyword
Controlling Access to Members of a Class
Understanding Instance and Class Members
Initializing Fields
Summary of Creating and Using Classes and Objects
Questions and Exercises
Questions and Exercises
Nested Classes
Inner Class Example
Summary of Nested Classes
Questions and Exercises
Enum Types
Questions and Exercises
Annotations
Questions and Exercises
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More on Classes
This section covers more aspects of classes that depend on using object references and the dot operator that you learned about in the preceding sections on objects:
  • Returning values from methods.
  • The this keyword.
  • Class vs. instance members.
  • Access control.
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