title: Shuffling numbers in a map and selecting one.
body: <p>I have a group of fixed numbers from 1 to 5. These are added into a Map as follows:</p>
  
  <pre><code>map.put(1, 1);
  map.put(2, 2);
  map.put(3, 3);
  map.put(4, 4);
  map.put(5, 5);
  </code></pre>
  
  <p>From that I randomly take two numbers that I remove from the <code>Map&lt;Integer, Integer&gt;</code> leaving three numbers.</p>
  
  <pre><code>map.remove(Rwiner);
  map.remove(Rsec);
  </code></pre>
  
  <p>This would leave me three numbers like 2,1,4. I want to pick out a random number from that. What should i do?</p>