How to convert list of enums into array of strings?

Question

I've had an array of enums like below:

enum CountryEnum {
   MADAGASCAR,
   LESOTHO,
   BAHAMAS,
   TURKEY,
   UAE
}

List<CountryEnum> countryList = new ArrayList<>();
countryList.add(CountryEnum.MADAGASCAR);
countryList.add(CountryEnum.BAHAMAS);

How to convert my countryList into String[]?

I've tried this way:

String[] countries = countryList.toArray(String::new);

but it returned me ArrayStoreException.

did you really get that error? or is the posted code wrong, missing the second [] like in String[] countries = countryList.toArray(String[]::new); — user16320675
– user16320675, Commented Jan 31, 2022 at 9:29

Georgii Lvov · Accepted Answer · 2022-01-31 09:32:50Z

5

It should work so:

 String[] strings = countryList.stream() // create Stream of enums from your list
                    .map(Enum::toString) // map each enum to desired string (here we take simple toString() for each enum)
                    .toArray(String[]::new); // collect it into string array

edited Jan 31, 2022 at 9:32

answered Jan 31, 2022 at 9:17

Georgii Lvov

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1 Comment

eis Over a year ago

the answer is correct, but it could benefit from some clarification as to why it is done this way

Dechire T · Accepted Answer · 2022-01-31 09:27:35Z

0

you can try this:

enum CountryEnum {
   MADAGASCAR("Madagascar"),
   LESOTHO("Lesotho"),
   BAHAMAS("Bahamas"),
   TURKEY("Turkey"),
   UAE("UAE");

    String country;
    CountryEnum(String country) {
        this.country = country;
    }
    
    public String getCountry() {
        return country;
    }
}

I added a constructor to be able to get (in String) enum's values. Now you can just use:

List<String> countryList = new ArrayList<>();
countryList.add(CountryEnum.MADAGASCAR.getCountry());
countryList.add(CountryEnum.BAHAMAS.getCountry());

👍 😀

answered Jan 31, 2022 at 9:27

Dechire T

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