How to Retrieve an Enum Value from a String in Java

How can I obtain an enum value from a string in Java?

public enum Blah {
    A, B, C, D
}

In Java, you can easily convert a string into its corresponding enum value using the `Enum.valueOf()` method. This method allows for type-safe access to enum constants based on their names, provided that the names in the string match those defined in the enum exactly (case-sensitive).

public static Blah getEnumValue(String value) {
    return Blah.valueOf(value);
} 

// Example usage:
String input = "A";
Blah enumValue = getEnumValue(input); // This will return Blah.A

Causes

• The input string might not match any enum constant's name exactly (case-sensitive).
• The enum type being referenced is not of the expected type for conversion.

Solutions

• Use the `Enum.valueOf()` method to retrieve the enum value from the string.
• Ensure that the input string matches the enum constant name exactly, including case sensitivity.

Mistake: Using a string that does not match any enum names.

Solution: Check the spelling and casing of the string. Use `toUpperCase()` or `toLowerCase()` if appropriate.

Mistake: Assuming `Enum.valueOf()` will handle null inputs gracefully.

Solution: Always check for null inputs before calling `Enum.valueOf()` to prevent `IllegalArgumentException`.