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    <blockquote> <p>Why is it 21? I thought it would be 22.</p> </blockquote> <p>The example is wrong. It will be 22.</p> <blockquote> <p>I tried thePieces[0][0][0].length but got an error that I did not understand? </p> </blockquote> <p>This requires a little explanation. When you say:</p> <pre><code>int[][][] thePieces = { ... } </code></pre> <p>You are declaring a variable called thePieces to be an array of arrays of arrays of ints. That sounds funny. Anyway, thePieces.length is valid, because thePieces is an array of some sort. When you dereference the array, like so:</p> <pre><code>thePieces[index] </code></pre> <p>You get an array of arrays of ints, which you can call length on, because it is an array of something. SO:</p> <pre><code>thePieces[index0][index1] </code></pre> <p>is an array of ints, which you can call length on (I hope you see a pattern by now).</p> <pre><code>thePieces[index0][index1][index2] </code></pre> <p>Gives you a plain-old int, which does not have a length property.</p> <blockquote> <p>I ran my piece code and got 2. I have no idea why it is two. Is it because I have two sets at the third level? I expected to get four because of the four sets of points.</p> </blockquote> <p>You call:</p> <pre><code>System.out.println(thePieces[0][0].length); </code></pre> <p>Which prints 2 because thePieces[0] points to this array:</p> <pre><code>{ //square {0,0}, {1,0}, {1,1}, {0,1} } </code></pre> <p>which would return 4 (if you called thePieces[0].length). However, thePieces[0][0] points to:</p> <pre><code>{0, 0} </code></pre> <p>which has length of 2.</p>
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    1. POHow do I reference multi-dimensional arrays?
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    1. COI understand now I think. If I used [][][] I have no length but a value because that is the reference to a specific item in the array of arrays of arrays. I could use (I am guessing) int myInt = thePieces[0][1][0] but not .length for the reasons you stated. In fact, it's the only way to get a value and all other ways besides the [][][] must use length (or maybe something else meaningful for arrays) because they are only pointing to an array at some level (array of array of array, array of array, array).
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