public ReactionForComment withReactionUsers(String... reactionUsers) {
        if (this.reactionUsers == null) {
            setReactionUsers(new java.util.ArrayList<String>(reactionUsers.length));
        }
        for (String ele : reactionUsers) {
            this.reactionUsers.add(ele);
        }
        return this;
    }
<p>
The Amazon Resource Names (ARNs) of users who have provided reactions to the comment.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setReactionUsers(java.util.Collection)} or {@link #withReactionUsers(java.util.Collection)} if you want
to override the existing values.
</p>

@param reactionUsers
       The Amazon Resource Names (ARNs) of users who have provided reactions to the comment.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-codecommit/src/main/java/com/amazonaws/services/codecommit/model/ReactionForComment.java