How can you access the enum constants of an enum type using Java Reflection?

Java MCQ: How can you access the enum constants of an enum type using Java Reflection?

Answer:

Explanation:

The getEnumConstants() method in Java is used to access the enum constants of an enum type using reflection. This method is part of the Class class and returns an array of the enum constants in the order they are declared.

Here’s an example of how to use getEnumConstants() to retrieve enum constants:

enum Day {
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}

public class GetEnumConstantsExample {
    public static void main(String[] args) {
        Class<Day> enumClass = Day.class;
        Day[] constants = enumClass.getEnumConstants();
        for (Day day : constants) {
            System.out.println(day);
        }
    }
}

In this example, the getEnumConstants() method is used to obtain an array of the enum constants defined in the Day enum. The constants are then printed to the console. This method is useful when you need to work with enums dynamically, for example, when creating frameworks or libraries that operate on enums without knowing their specifics at compile-time.

Enum handling via reflection allows for more flexible and reusable code, particularly in scenarios where enum types are used in configuration, validation, or as part of an API.

Reference links:

https://www.rameshfadatare.com/learn-java-programming/
https://www.javaguides.net/p/java-tutorial-learn-java-programming.html