public ACL withUserNames(java.util.Collection<String> userNames) {
        setUserNames(userNames);
        return this;
    }
<p>
The list of user names that belong to the ACL.
</p>

@param userNames
       The list of user names that belong to the ACL.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-memorydb/src/main/java/com/amazonaws/services/memorydb/model/ACL.java