import java.util.*; import java.util.stream.Collectors; public class Program { public static void main (String[] args) { ArrayList sequencia = new ArrayList<>(); sequencia.add(2); sequencia.add(11); sequencia.add(12); sequencia.add(13); sequencia.add(14); sequencia.add(14); System.out.println(sequencia.stream().distinct().collect(Collectors.toList()).toString()); } } //https://pt.stackoverflow.com/q/265506/101