new variant

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class Delete2 {
    public static void main(String args[]) {
        Integer[] inputArray = {1, 1, 3, 4, 4, 4, 4, 4, 5, 6, 7, 7};
        Set<Integer> list = new HashSet<>(Arrays.asList(inputArray));
        list.forEach(System.out::println);
    }
}