Java Enums: Defining Enum Types with Custom Fields and Methods

Intermediate13 min read•Updated: 2026-10-22

🏷️ Java Enums: Fields, Constructors, and Methods

Introduction

Unlike enums in C/C++ which are merely named integers, a Java Enum is a full-fledged class. Enums provide type-safe constants and can contain fields, constructors, and methods.

💻 Rich Enum Implementation

1public enum CourseLevel {
  BEGINNER("Level 1: Core Fundamentals", 2499.0),
  INTERMEDIATE("Level 2: OOP & Collections", 3499.0),
  ADVANCED("Level 3: Concurrency & Architecture", 4499.0);
5 
  private final String description;
  private final double fee;
8 
  // Enum constructor is private by default
  CourseLevel(String desc, double price) {
      this.description = desc;
      this.fee = price;
  }
14 
  public String getDescription() { return description; }
  public double getFee() { return fee; }
17 
  public static void main(String[] args) {
      // Iterating through all enum values:
      for (CourseLevel level : CourseLevel.values()) {
          System.out.printf("[%s] %s - Fee: ₹%,.2f%n", 
              level.name(), level.getDescription(), level.getFee());
      }
24 
      // Clean usage in Switch statements:
      CourseLevel selected = CourseLevel.INTERMEDIATE;
      switch (selected) {
          case BEGINNER -> System.out.println("Starting your journey!");
          case INTERMEDIATE -> System.out.println("Diving into OOP & Collections!");
          case ADVANCED -> System.out.println("Mastering Enterprise Architecture!");
      }
  }
33}

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Modern Java Records (Java 14+) for Immutable Data Modeling

Java Enums: Defining Enum Types with Custom Fields and Methods

Intermediate13 min read•Updated: 2026-10-22

Study Materials

🏷️ Java Enums: Fields, Constructors, and Methods

Introduction

Unlike enums in C/C++ which are merely named integers, a Java Enum is a full-fledged class. Enums provide type-safe constants and can contain fields, constructors, and methods.

💻 Rich Enum Implementation

1public enum CourseLevel {
  BEGINNER("Level 1: Core Fundamentals", 2499.0),
  INTERMEDIATE("Level 2: OOP & Collections", 3499.0),
  ADVANCED("Level 3: Concurrency & Architecture", 4499.0);
5 
  private final String description;
  private final double fee;
8 
  // Enum constructor is private by default
  CourseLevel(String desc, double price) {
      this.description = desc;
      this.fee = price;
  }
14 
  public String getDescription() { return description; }
  public double getFee() { return fee; }
17 
  public static void main(String[] args) {
      // Iterating through all enum values:
      for (CourseLevel level : CourseLevel.values()) {
          System.out.printf("[%s] %s - Fee: ₹%,.2f%n", 
              level.name(), level.getDescription(), level.getFee());
      }
24 
      // Clean usage in Switch statements:
      CourseLevel selected = CourseLevel.INTERMEDIATE;
      switch (selected) {
          case BEGINNER -> System.out.println("Starting your journey!");
          case INTERMEDIATE -> System.out.println("Diving into OOP & Collections!");
          case ADVANCED -> System.out.println("Mastering Enterprise Architecture!");
      }
  }
33}

Next Lesson

Modern Java Records (Java 14+) for Immutable Data Modeling

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
Package Scope and Information Hiding	Modern Java Records (Java 14+) for Immutable Data Modeling

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next