Special Characters in Java Enums

Question

Currently attempting to have special characters, primarily '.' a number, however, it seems enums require letters only. Is there a way to use special characters? Currently trying to make a file saver and many file types have numbers in them, an example being:

public enum FileType {

    7z(".7z"),
    ace(".ace"),
    apk(".apk"),
    bz2(".bz2"),
    crx(".crx"),
    dd(".dd"),
    deb(".deb"),
    gz(".gz"),
    gzip(".gzip"),
    jar(".jar"),
    rar(".rar"),
    rpm(".rpm"),
    sit(".sit"),
    sitx(".sitx"),
    snb(".snb"),
    tar(".tar"),
    tar.gz(".tar.gz"),
    tqz(".tqz"),
    zip(".zip"),
    zipx(".zipx");

    public final String FILESUFFIX;

    FileType(String FileSuffix) {
        this.FILESUFFIX = FileSuffix;
    }

    public String getSuffix() {
        return FILESUFFIX;
    }
}

I have looked throughout StackOverflow, however, I haven't found a way that suited me. I do not understand how to do 'maps' or the other fancy stuff, so is there an alternate way to simple get something like mp4 to be an Enum?

Answer 1

this value declared in the enum 7z is invalid same as you can not declare a variable with the name 7z since that will be an invalid java identifier https://docs.oracle.com/cd/E19798-01/821-1841/bnbuk/index.html

alternative to that you can play with underscores,and something better is use UPPER_CASE

public enum FileType {

    _7Z(".7z"),
    _ACE(".ace"),
    _APK(".apk"),
    _BZ2(".bz2"),
    _CRX(".crx"),
    etc etc

Answer 2

Enum identifiers follow the same rules as other Java identifiers:

The only allowed characters for identifiers are all alphanumeric characters([A-Z],[a-z],[0-9]), ‘$‘(dollar sign) and ‘_‘ (underscore).

Identifiers should not start with digits([0-9]). For example “123geeks” is a not a valid java identifier.

Java identifiers are case-sensitive

From your example, mp4 is a valid identifier, but 7z is not (because it starts with a number)

Note: by convention, enum identifiers are typically all uppercase.