In Java, access specifiers are the keywords which are used to define the access scope of the method, class, or a variable.
There are four access specifiers in java.
Public – The classes, methods, or variables which are defined as public, can be accessed by any class or method.
Protected – Protected can be accessed by the class of the same package, or by the sub-class of this class, or within the same class.
Default – Default are accessible within the package only. By default, all the classes, methods, and variables are of default scope.
Private – The private class, methods, or variables defined as private can be accessed within the class only.