title: How to include duplicate keys in HashMap?
body: <p>I need linked and  multiple keys in key set. I tried this:</p>
  
  <pre><code>LinkedHashMap&lt;Integer, String&gt; map = new LinkedHashMap&lt; Integer,String&gt;();
  
  map.put( -1505711364,"4");
  map.put(294357273, "15"); map.put(-1593134417, "28"); map.put(-1231165758, "45");
  map.put(121046798, "58");
  map.put(294357273, "71"); map.put(-1593134417, "82"); map.put(-1231165758, "95");
  map.put(121046798, "108");
  </code></pre>
  
  <p>I need duplicate keys which is order preserved. What is the way to do this??</p>