More efficient way to remove elements from an array list

Question

I have developed a array list something like this

ArrayList list = new ArrayList();
list.add(\"1\");
list.add(\"8\");
list.add(\"8\"         


        

Answer 1

Performance wise they should be similar. Have you tested? If you want to use the built in methods, you can do this with a similar performance.(to be confirmed by testing):

list.removeAll(Arrays.asList("8"));

Finally if you want a list without duplicates, use a Set as others have mentioned.