Enum in java

Java restrict a variable to have only a few redefined variables

Enum constants are implicitly static and final

Advantages of enum:

• Main benefit of enum is: we can add new constants without breakng exisiting code
• Enum is type-safe because we can't assign anything else other than predefined Enum constants to an Enum variable.
• It has its own namespace
• It can be used inside the Switch statement
• We can create reference variable in enum
• Constants are always written in Capital Letters
• If enum is written outside the class, it should be declared as public or default

Rules

• enum cannot be overwritten in a method
• semicolon is optional for enum

Example

class Coffee1

{

 enum CofeeSize{BIG,HUGE,OVERWHELMING}

  CoffeeSize size;  //creating a reference variable

}

public class CoffeeTest

{

public static void main(String args[])

{

  Coffee1 c=new Coffee1();

 c.size=Coffee1.CoffeeSize.BIG;

 }

}

How to access Enum variables

Object.Reference variable=Classname.enumname.value

Ex: To access value BIG

 c.size=Coffee1.CoffeeSize.BIG;