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Editorial Team
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Asked: 2026-05-21T11:56:43+00:00

Is there a better way to do this so I don’t have to have

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Is there a better way to do this so I don’t have to have 50 “.add()”s in there? Like a comma separated list or something (like JavaScript arrays).

private static final Set<String> validStates = new HashSet<String>();

validStates.add("AL");
validStates.add("AK");
validStates.add("AZ");
validStates.add("AR");
validStates.add("CA");
validStates.add("CO");
validStates.add("CT");
validStates.add("DE");
validStates.add("DC");
validStates.add("FL");
validStates.add("GA");
validStates.add("HI");
validStates.add("ID");
validStates.add("IL");
validStates.add("IN");
validStates.add("IA");
validStates.add("KS");
validStates.add("KY");
validStates.add("LA");
validStates.add("ME");
validStates.add("MD");
validStates.add("MA");
validStates.add("MI");
validStates.add("MN");
validStates.add("MS");
validStates.add("MO");
validStates.add("MT");
validStates.add("NE");
validStates.add("NV");
validStates.add("NH");
validStates.add("NJ");
validStates.add("NM");
validStates.add("NY");
validStates.add("NC");
validStates.add("ND");
validStates.add("OH");
validStates.add("OK");
validStates.add("OR");
validStates.add("PA");
validStates.add("RI");
validStates.add("SC");
validStates.add("SD");
validStates.add("TN");
validStates.add("TX");
validStates.add("UT");
validStates.add("VT");
validStates.add("VA");
validStates.add("WA");
validStates.add("WV");
validStates.add("WI");
validStates.add("WY");

Something like:

validStates.add("AL", "AK", "...");
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1 Answer

  1. Editorial Team

    You can use Set#of() for this.

    validStates = Set.of("AL", "AK", "..");

    In case you’re not on Java 9 yet, then you could use Stream#of() instead.

    validStates = Stream.of("AK", "AL", "..").collect(Collectors.toSet());

    In case you’re even not on Java 8 yet, then use the HashSet constructor taking a Collection in combination with Arrays#asList().

    validStates = new HashSet<String>(Arrays.asList("AL", "AK", ".."));

    It makes however more sense to have them in some properties file or in a DB which you load by one or two lines of code so that you don’t need to hardcode them all in Java.

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