How do I use enums together with command line arguments?

2018-06-13 08:33:20

This question already has an answer here:

Lookup Java enum by string value 23 answers

Try:

public static void main(String[] args) {
    try {
        App argArg = App.valueOf(args[0]);
        ENV argENV = ENV.valueOf(args[1]);
    } catch(IllegalArgumentException e) {
        printHelp();
        System.exit(1);
    }
    ...
}

In printHelp() you can list all possible values with:

StringBuffer appParamHelp = new StringBuffer("Possible 'App' values are:");
for(App possibleAppVal : App.values) {
    appParamHelp.append(" ");
    appParamHelp.append(possibleAppVal.name());
}

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