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    <p>The code does the following things:</p> <p>It set a constant named <code>DEFAULT_PRIOR</code> (java equivalent would be a static final variable) to an array containing the number 2 five times. In java:</p> <pre><code>static final int[] DEFAULT_PRIOR = {2,2,2,2,2}; </code></pre> <p>It defines a two-argument method named score where the second argument defaults to <code>DEFAULT_PRIOR</code>. In java this can be achieved with overloading:</p> <pre><code>float score(int[] votes) { return score(votes, DEFAULT_PRIOR); } </code></pre> <p>Inside the score method, it does the following:</p> <pre><code>posterior = votes.zip(prior).map { |a, b| a + b } </code></pre> <p>This creates an array posterior, where each element is the sum of the corresponding element in votes and the corresponding element in prior (i.e. <code>posterior[i] = votes[i] + prior[i]</code>).</p> <pre><code>sum = posterior.inject { |a, b| a + b } </code></pre> <p>This sets sum to be the sum of all elements in <code>posterior</code>.</p> <pre><code>posterior. map.with_index { |v, i| (i + 1) * v }. inject { |a, b| a + b }. to_f / sum </code></pre> <p>This bit multiplies each element in posterior with its index plus one and then sums that. The result is converted to a float and then divided by <code>sum</code>.</p> <p>In java you would iterate over posterior with <code>for</code>-loop (not foreach) and in each iteration add <code>(i + 1) * posterior[i]</code> (where <code>i</code> is the index of the <code>for</code>-loop) to a variable <code>tmp</code>, which you set to 0 before the loop. Then you would cast <code>tmp</code> to <code>float</code> and divide it by <code>sum</code>.</p>
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    1. COthanks for that. Can u show how the last bit looks like in java? I'm lost trying to write that part. Thank you for the hep anyway. very much appreciated
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    2. CO@Farouk: Added one paragraph at the end.
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    3. COI think it may be misleading that you say its static.
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