public void setUserMatches(java.util.Collection<UserMatch> userMatches) {
        if (userMatches == null) {
            this.userMatches = null;
            return;
        }

        this.userMatches = new java.util.ArrayList<UserMatch>(userMatches);
    }
<p>
An array of UserID objects that matched the input face, along with the confidence in the match. The returned
structure will be empty if there are no matches. Returned if the SearchUsersByImageResponse action is successful.
</p>

@param userMatches
       An array of UserID objects that matched the input face, along with the confidence in the match. The
       returned structure will be empty if there are no matches. Returned if the SearchUsersByImageResponse
       action is successful.
aws-java-sdk-rekognition/src/main/java/com/amazonaws/services/rekognition/model/SearchUsersByImageResult.java