Remove duplicates from List using Guava

Question

How can we remove duplicates from List with the help of Guava api?

Currently I am following this:

private List removeDuplic         


        

Answer 1

I love Louis' answer for the simplicity of it (and because it's the only answer that doesn't require 2 full iterations), but unfortunately in the real world, you often encounter situations where null does occur. Here's a slightly longer null-safe version:

ImmutableSet.copyOf(
    Iterables.filter(
        list, Predicates.not(Predicates.isNull()))).asList();

Or, with static imports:

copyOf(filter(list, not(isNull()))).asList();

Of course you need to be aware of the fact that all null Values will be lost from the List.