Access Modifiers for Classes or Interfaces in Java

Access modifiers in Java are used to control the visibility of the variables, classes and methods within a class or package. There are different types of access modifiers that are used to define the accessibility in different ways. The access modifiers strictly enforce the level of accessibility and these are defined by different keywords.

Example: Access modifiers with interface and classes.

This is a public method.
Method in the private interface.
This is a private method.
This is a protected method.
This is a package-private method.

Explanation:

• Only one top-level class (Geeks) is declared public to match the file name Geeks.java, while Display and AccessModifiers remain package-private, which is valid in Java.
• The program demonstrates all access modifiers: public, protected, private and default (package-private) within the AccessModifiers class.
• Display interface uses a default method, introduced in Java 8, allowing interfaces to contain method implementations.
• The demonstrateAccess() method showcases internal access to private, protected and package-private methods from within the same class.
• AccessModifiers implements the Display interface and the main() method uses polymorphism to call interface and class methods.

Different Access Modifiers

1. public Access Modifier

The public modifier provides the highest access among all the modifiers. We can access it anywhere in the package. The public modifier allows to use the variable, methods and class to acess in the same package.

Example: Demonstration of public access modifier in Java.

Hello Geeks

2. protected Access Modifier

The protected modifier in Java allows the class, method and variable to Accessible within the same package and subclasses.

Example: Demonstrating the protected modifier in Java.

This is the protected method.

3. private Access Modifier

The private access modifier is used with method, class and variable and if the it can be only accessible in the class where it is defined.

Example: Demonstrating the private access modifier.

Private variable having message: Hello Geeks

4. default Access Modifier

When the modifier is not define then it automatically specified default method or package private. The default having the accessibility within the same package. If the the variable, method or class having no modifier then it considered as defualt modifier

Example: Demonstrating the default modifier in Java

This method having defualt modifier.

Access Modifiers Accessibility Level For Classes And Interface