title: Difference between array.length and array[0].length in a multi-dimensional array?
body: <p>When I create a new multi-dimensional array (in this case an array of objects)</p>
  
  <pre><code>public Block[][] block = new Block[50][70];
  </code></pre>
  
  <p>What is the difference between:</p>
  
  <pre><code>block.length
  </code></pre>
  
  <p>and</p>
  
  <pre><code>block[0].length
  </code></pre>
  
  <p>and then what is</p>
  
  <pre><code>block[1].length
  </code></pre>