access protection in java code example

Example 1: java protected

/* similar to private keyword, but also lets both:
  - subclasses
  - classes in same package
  access the variable, method or constructor */

class Superclass {
  protected int myNumber = 5;
}

class Subclass extends SuperClass {
  // has access to myNumber
}

class InAnotherPackage {
  // doesn't have access to myNumber
}

Example 2: access modifiers in java

In Java, access specifiers are the keywords which are used to define 
the access scope of the method, class, or a variable. 
  In Java, there are four access specifiers.
  
  * 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