Character is letter at java : <pre><code>public boolean isAnagram(ArrayList&lt;Character&gt; arr1, ArrayList&lt;Character&gt; arr2) {
    if( arr1 == null || arr2 == null || arr1.isEmpty() || arr2.isEmpty()){
        return false;// TODO
    }
    for( int i = 0; i &lt; arr1.size(); i++){
        if(arr1.get(i) == Character.isLetter()){
            Character.toLowerCase(arr1.get(i));
             return true;
        }
</code></pre>

<p>Thats a Part of my Code, and i do not understand what I should write into Character.isLetter(DONT KNOW)) --> ps. also do not know, wheater that Code works
I want that he Returns true, when i is a Letter.  </p>
