Java Enums
In Java, an enum (short for enumeration) is a special data type that allows a variable to be one of a predefined set of constants. This is useful when you know all possible values at compile time.
Why Use Enums?
● To define a fixed set of related constants.
● To enhance code readability and avoid errors from using arbitrary values.
● To ensure that the variable only holds valid values from the defined set.
Syntax:
enum EnumName {
CONSTANT1, CONSTANT2, CONSTANT3;
}
Example:
enum Day {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY;
}
public class Main {
public static void main(String[] args) {
Day today = Day.TUESDAY;
System.out.println(“Today is: ” + today);
}
}
Output:
Today is: TUESDAY
Tasks:
1. Define an enum for the months of the year and print out a specific month.
2. Write a Java program using an enum to represent traffic light signals (RED, YELLOW, GREEN) and display an appropriate message based on the signal.
3. Create an enum for different levels of a game (BEGINNER, INTERMEDIATE, ADVANCED) and assign it to a variable to print out the level.
Course Video
YouTube Reference :
The training covers Java enums, including their concepts, syntax, and practical applications.
Yes, it includes examples demonstrating how to define enums and use them in Java programs.
Yes, exercises involve creating enums for various scenarios to understand their usage.
Yes, it’s designed for beginners with clear explanations and step-by-step examples.
A Java IDE like Eclipse, IntelliJ IDEA, or an online compiler will suffice.
Yes, it covers how enums provide a way to define a set of named constants, enhancing code readability and reliability.
Yes, the training is self-paced and accessible online anytime.
Yes, it explains how to use enums in switch statements for control flow.
Yes, this Java Enums training is completely free on Iqra Technology Academy’s website.