Removing null elements from List in Java

In this tutorial lets see how to remove null elements from the given list by using java Collections. Basic we could think iterating through List and to delete all null elements. But by using Collections class it makes easy to remove all null elements. Lets see simple example to delete null elements from list.
Removing null elements from List in Java


public static void main(String[] args) {
 
 final List<Integer> list = new ArrayList<Integer>();
 Collections.addAll(list, 1,2,null,3,4,null,5,6,null,7,8,null,9);
 
 System.out.println("LIST SIZE : "+list.size()+ " - " + list);
 
 list.removeAll(Collections.singleton(null));
 
 System.out.println("LIST SIZE : "+list.size()+ " - " + list);
}



OUTPUT:


LIST SIZE : 13 - [1, 2, null, 3, 4, null, 5, 6, null, 7, 8, null, 9]
LIST SIZE : 9 - [1, 2, 3, 4, 5, 6, 7, 8, 9]


No comments :

Post a Comment