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    <p>As @tafa said, it seems to me an interface would be a good choice. Based on your signature for <code>average</code>, I came up with the below.</p> <p><strong>AveragableValue</strong></p> <pre><code>public interface AveragableValue&lt;T&gt; extends Value { public T average(T value); } </code></pre> <p><strong>NumberValue</strong></p> <pre><code>public class NumberValue implements AveragableValue&lt;NumberValue&gt; { private int _n; public NumberValue(int n) { this._n = n; } @Override public void doSomething() { // from Value interface } @Override public NumberValue average(NumberValue value) { return new NumberValue((this._n + value._n) / 2); } } </code></pre> <p>Then you can have your collection be of type <code>AveragableValue</code>. Already in your code you must have some kind of <code>if/else</code> clause somewhere to differentiate <code>NumberValue</code> and <code>StringValue</code> to figure out whether to call <code>average</code> or not. So I don't see how this would be more complicated. The hierarchy make sense - <code>AveragableValue</code>s are a subtype of <code>Value</code>, and a <code>NumberValue</code> is a type of <code>AveragableValue</code>.</p> <p>However, that signature for <code>average</code> doesn't look right. It only takes 2 values (<code>this</code> and the argument) and averages them. You then lose the total count of things that have been averaged before. So assuming integers as the values (as I did), something like this:</p> <pre><code>(new NumberValue(4)).average(new NumberValue(8)).average(new NumberValue(12)); </code></pre> <p>would give you the value <code>9</code> instead of <code>8</code>. Is this what you want? It makes it bad for many calculations done iteratively, as you may be doing with collections.</p> <p>If you show us some of your code - how these classes are used, the collections holding them, how you are doing averaging right now - I can maybe give a better answer.</p>
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