if else statement return a string, error. : <p>why do i get an error, is it because im missing a return after the if checks? could i resolve it by setting one last return to null </p>

<pre><code>public static String whoWins(rockPaperScissors user, rockPaperScissors computer){

    if(user == ROCK &amp;&amp; computer == SCISSORSS){
        return "user wins";
    }
    if(user == PAPER &amp;&amp; computer == ROCK){
        return " user wins";
    }
    if(user == SCISSORSS &amp;&amp; computer == PAPER){
        return "user wins";
    }
    if(computer == ROCK &amp;&amp; user == SCISSORSS){
        return "computer wins";
    }
    if(computer == PAPER &amp;&amp; user == ROCK){
        return "computer wins";
    }
    if (computer == SCISSORSS &amp;&amp; user == PAPER){
        return "computer wins";
    }
}
</code></pre>
