NullpointerException?
<p>I created a new binary tree with a root 5 for instance
and the child nodes are null by default</p>

<p>but when i assign  </p>

<pre><code>     tree.root.left.data = 6;
</code></pre>

<p>a nullpointerException error comes up,  </p>

<p>how would i solve such a thing</p>
