How to Check if an Enum Contains a Constant by Name in Java?

How can I check if a Java Enum contains a constant with a specified name?

public static boolean contains(String enumName) {
    for (MyEnum constant : MyEnum.values()) {
        if (constant.name().equals(enumName)) {
            return true;
        }
    }
    return false;
}

In Java, Enums are a powerful feature that allows you to define a set of named constants. Sometimes, you may need to check if an Enum contains a specific constant based on its name. This can be useful for validating input or ensuring that only specific values are processed in a program.

public static boolean contains(String enumName) {
    try {
        MyEnum.valueOf(enumName);
        return true;
    } catch (IllegalArgumentException e) {
        return false;
    }
}

Causes

• Typo in the constant name when checking for existence.
• Using incorrect Enum class type while performing the check.
• Necessary imports missing or not having a proper package structure.

Solutions

• Utilize the `Enum.valueOf()` method to check for existence of a constant.
• Implement a custom method that iterates over the Enum values and matches against the provided name.
• Consider using exception handling to catch invalid names when using `Enum.valueOf()`.

Mistake: Not using the correct case when checking enum names.

Solution: Enum names are case-sensitive; ensure that the casing of the string matches the Enum definition.

Mistake: Forgetting to handle potential exceptions when using `Enum.valueOf()`.

Solution: Always enclose `Enum.valueOf()` in a try-catch block to handle `IllegalArgumentException`.