Modifier in java

Visibility Modifier

• Default : By defualt the class, data fields or variables and methods can accessed by any other class from the same package.
• Public :  class, data fields and methods are accessible to any class in any package
• Private : data fields and methods are accessible within declaring class
• Protected : A protected data or a protected method in a public class can be accessed by any class in the same package or its subclasses, even if the subclasses are in a different package.

Static Modifier :

Declaring property (methods or data fields) as a static,  allows to share the property with all instances of the class. Further details are discussed in my previous article “Instance and Static variables and Methods.”

Final Modifier :

final keyword can be used with class, data fields or variables and methods.

• Using final with class, it can’t be extended
• Using final with method, it can’t be overrident by any subclass
• Using final with variable or data field, it is a constant

Note :

• If you are designing a class from user point of view then make all data fields private and accessor methods public
• if you are designing a class from extender point of view then make all data fields and methods protected
• Get and set methods are used to read and change private properties or data fields.
• To protect data and hide internal details, use private modifier