import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

class Scratch {
    public static void main(String[] args) {
        String[] shops = {"DE", "CH", "AT", "NL", "FR", "DK", "ES", "IT", "EN", "SE", "NO", "FI", "PT", "BE", "LU", "RO", "GR", "CZ", "PL", "HU"};

        List<String> shopList = Arrays.asList(shops);
        Collections.shuffle(shopList);
        String result = shopList.stream().limit(5).collect(Collectors.joining("+"));
        System.out.println(result);
    }
}

if () {
Intent int = new Intent();
startActivity(int);
 } else {
//do something
}