title: How to read the second column in a large file
body: <p>I have a huge file with millions of columns, splited by space, but it only has a limited number of rows:</p>
  
  <p>examples.txt:</p>
  
  <pre><code>1 2 3 4 5 ........
  3 1 2 3 5 .........
  l 6 3 2 2 ........
  </code></pre>
  
  <p>Now, I just want to read in the second column:</p>
  
  <pre><code>2
  1
  6
  </code></pre>
  
  <p>How do I do that in java with high performance.</p>
  
  <p>Thanks</p>
  
  <p>Update: the file is usually 1.4G containing hundreds of rows.</p>