remove first object from list java code example

Example 1: python remove first element from list

>>> l = [1, 2, 3, 4, 5]
>>> l
[1, 2, 3, 4, 5]
>>> l.pop(0)
1
>>> l
[2, 3, 4, 5]

Example 2: java 8 retrieve all list from object into single list and ignore duplicates

public void
  givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
    List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
    List<Integer> listWithoutDuplicates = listWithDuplicates.stream()
     .distinct()
     .collect(Collectors.toList());
}