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Can you use a switch statement around an enum in Java?
Enumeration (enum) in Java is a datatype which stores a set of constant values. You can use enumerations to store fixed values such as days in a week, months in a year etc.
enum Days {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}You can also define an enumeration with custom values to the constants declared. But you need to have an instance variable, a constructor and getter method to return values.
Using enumeration with switch
A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case
Syntax
switch(expression) {
case value :
// Statements
break;
case value :
// Statements
break;
// You can have any number of case statements.
default :
// Statements
}With the switch statement you can use int, char or, enum types. Usage of any other types generates a compile time error.
Example
Let us create an enum with 5 constants representing models of 5 different scoters with their prices as values, as shown below −
enum Scoters {
//Constants with values
ACTIVA125(80000), ACTIVA5G(70000), ACCESS125(75000), VESPA(90000), TVSJUPITER(75000);
//Instance variable
private int price;
//Constructor to initialize the instance variable
Scoters(int price) {
this.price = price;
}
//Static method to display the price
public static void getPrice(int model){
Scoters constants[] = Scoters.values();
System.out.println("Price of: "+constants[model]+" is "+constants[model].price);
}
}Following Java program retrieves the prices of all the vehicles using switch case.
public class EnumExample {
Scoters sc;
public EnumExample(Scoters sc) {
this.sc = sc;
}
public void displayPrice() {
switch (sc) {
case Activa125:
Scoters.getPrice(0);
break;
case Activa5G:
Scoters.getPrice(1);
break;
case Access125:
Scoters.getPrice(2);
break;
case Vespa:
Scoters.getPrice(3);
break;
case TVSJupiter:
Scoters.getPrice(4);
break;
default:
System.out.println("Model not found");
break;
}
}
public static void main(String args[]) {
EnumExample activa125 = new EnumExample(Scoters.ACTIVA125);
activa125.displayPrice();
EnumExample activa5G = new EnumExample(Scoters.ACTIVA5G);
activa5G.displayPrice();
EnumExample access125 = new EnumExample(Scoters.ACCESS125);
access125.displayPrice();
EnumExample vespa = new EnumExample(Scoters.VESPA);
vespa.displayPrice();
EnumExample tvsJupiter = new EnumExample(Scoters.TVSJUPITER);
tvsJupiter.displayPrice();
}
}Output
Price of: ACTIVA125 is 80000 Price of: ACTIVA5G is 70000 Price of: ACCESS125 is 75000 Price of: VESPA is 90000 Price of: TVSJUPITER is 75000
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