Modifiers Types

A modifier is a keyword placed in a class, method or variable declaration that changes how it operates.
Java has long list of modifiers. Given below the two categories of access modifier :

• Java Access Modifier
• Non Access Modifier

Java Access Modifier
Java has a number of access modifier to control access for classes, variables, methods and constructors. Following are the four types :

• default - No need of access modifier, It is automatically visible to the package.
• private - It is used to set the visibility to class level.
• public - for setting visibility inside and outside package.
• protected - for setting visibility to the package and all subclasses 

Non Access Modifiers :

• Java has a variety of non access modifier, some are given below :
• The static modifier is used to create static class methods and variables.
• The final modifier is used to prevent variables from being modified. It behaves like constant. It is also used to prevent overloading and inheritance.
• The abstract modifier is used to create abstract classes and methods.
• The synchronized and volatile modifiers are used for threads.