title: Concatenating two hashmaps without removing common entires from both the maps
body: <p>I have two hashmaps, in particular vocabs of two languages say english and german.I would like to concatenate both these map to return a single map.I tried :</p>
  
  <pre><code> hashmap.putall()
  </code></pre>
  
  <p>But, removed some of the entries which are common in both maps and replace it by single entry only.But i want to keep both the vocabs intact just concatenate those. Is there any method to do it? if not any other way to do. I would prefer any methods in hashmap.</p>
  
  <p>[EDIT]</p>
  
  <p>To make more clear, lets see two maps </p>
  
  <pre><code>      at the 500    um die 500
        0   1   2     0   1   2
  </code></pre>
  
  <p>resutls into </p>
  
  <pre><code>  at the  500 um die 500
    0   1    2   3  4   5               
  </code></pre>