Java Visibility .

Java Visibility of Variables and Methods

• One of the most important aspects of object-oriented design is data hiding, or encapsulation.

Basic Access Modifiers:

• Without access modifier (default), the variables and methods of a class are accessible to members of the class itself and to other classes in the same package.
• Methods and variables (members) declared with a private modifier are accessible only within their class.
• Members declared with a public modifier are accessible from any class in any package.
• Members declared with a protected modifier are accessible by other classes in the package and sub-classes inside or outside the package.

Private, default, protected, and public visibility illustration: