Java remove all null elements from list 2017-03-04 04:56
If there are more than one null elements in list list.remove() method can not remove all of them. Use list.removeAll() to remove them. Example code is like following.
public static void main(String[] args) {
List<String> list1 = new ArrayList<>();
list1.add(null);
list1.add(null);
list1.add("2");
list1.add("3");
list1.remove(null);
System.out.println(list1);//[null, 2, 3]
List<String> list2 = new ArrayList<>();
list2.add(null);
list2.add(null);
list2.add("2");
list2.add("3");
list2.removeAll(Collections.singletonList(null));
System.out.println(list2);//[2, 3]
}