Usage of Enum and Switch Keyword in Java - GeeksforGeeks

28 Feb, 2022
An Enum is a unique type of data type in java which is generally a collection (set) of constants. More specifically, a Java Enum type is a unique kind of Java class. An Enum can hold constants, methods, etc. An Enum keyword can be used with if statement, switch statement, iteration, etc. 
enum constants are public, static, and final by default.
enum constants are accessed using dot syntax.
An enum class can have attributes and methods, in addition to constants.
You cannot create objects of an enum class, and it cannot extend other classes.
An enum class can only implement interfaces.
Example:
Java
// Java Program to show working of Enum// Keyword when declared outside the Class enum Days {    MONDAY,    TUESDAY,    WEDNESDAY,    THURSDAY,    FRIDAY,    SATURDAY,    SUNDAY;} public class temp {     // Driver method    public static void main(String[] args)    {        Days x = Days.FRIDAY;        System.out.println(x);    }}
FRIDAY
The Switch statement is helpful when a user has a number of choices and wants to perform a different task for each choice. The Switch statement allows the testing of a variable for equality against a list of values. Each value is known as a case. A switch Case statement is generally used with a break statement but it is optional. 
Example:
Java
// Java Program to show working// of Switch statement public class Example_Switch {     public static void main(String[] args)    {        // Declare a variable for switch statement        int num = 50;         // Switch keyword        switch (num) {        // Case statements        case 10:            System.out.println("10");            break;        case 20:            System.out.println("20");            break;        case 30:            System.out.println("30");            break;        // Default case statement        default:            System.out.println("Other than 10, 20 or 30");        }    }}
Other than 10, 20 or 30
We can use also use Enum keyword with Switch statement. We can use Enum in Switch case statement in Java like int primitive. Below are some examples to show working of Enum with Switch statement.
Example 1: Use of Enum with Switch statement when Enum is outside the main class
Java
// Java Program to show the// working of Enum keyword// with Switch statement // Enum keyword declared outside main classenum Cars {    BMW,    JEEP,    AUDI,    VOLKSWAGEN,    NANO,    FIAT;} // Main classpublic class Main {    public static void main(String args[])    {        // Declaring Enum variable        Cars c;        c = Cars.AUDI;        // Switch keyword        switch (c) {         // Case statements        case BMW:            System.out.println("You choose BMW !");            break;        case JEEP:            System.out.println("You choose JEEP !");            break;        case AUDI:            System.out.println("You choose AUDI !");            break;        case VOLKSWAGEN:            System.out.println("You choose VOLKSWAGEN !");            break;        case NANO:            System.out.println("You choose NANO !");            break;        case FIAT:            System.out.println("You choose FIAT !");         default:            System.out.println("NEW BRAND'S CAR.");            break;        }    }}
You choose AUDI !
In the above example, we show how the Enum keyword works along with Switch case statements when Enum is declared outside the main class.
Example 2: Use of Enum with Switch statement when Enum is within the main class
Java
// Java Program to Show// working of Enum keyword// with Switch statement // Main classpublic class MainClass {     // Declaring Enum keyword    // inside main class    enum Webseries {        GOT,        Breakingbad,        Lucifer,        Boys,        Mirzapur,        Moneyheist;    }    public static void main(String[] args)    {        // Declaring and Assigning choice to variable 'wb'        Webseries wb = Webseries.Mirzapur;         // Switch Keyword         switch (wb) {         // Case statements        case GOT:            System.out.println("Game of Thrones selected");            break;        case Breakingbad:            System.out.println("Breaking Bad selected");            break;        case Lucifer:            System.out.println("Lucifer selected");            break;        case Boys:            System.out.println("Boys selected");            break;        case Mirzapur:            System.out.println("Mirzapur selected");            break;        case Moneyheist:            System.out.println("Money Heist selected");            break;        default:            System.out.println("You are outdated !!!");            break;        }    }}
Mirzapur selected
In the above example, we show how the Enum keyword works along with Switch case statements when Enum is declared within main class.
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