How to get different random numbers?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/9052519/non-repeating-random-number-array">Non repeating random number array</a>  </p>
</blockquote>



<p>I have a String array with many elements (as I haven't still finished the Application, I don't know exactly the number), maybe about 200. I would like to get 20 random elements of this array, but being certain that every random element occurs only once, like, I don't want to get in those 20 elements the 5th element (for example) twice. How can I do this?</p>
