title: ConcurrentHashMap - adding items with the same Key
body: <p>I have a CuncurrentHasMap:</p>
  
  <pre><code>private static ConcurrentHashMap&lt;String, Object&gt; testParameters =
  new ConcurrentHashMap&lt;String, Object&gt;();
  </code></pre>
  
  <p>I am pushing (sometimes) objects with the same keys, those objects are TreeMaps of type TreeMap(string, MyPrivateClass).</p>
  
  <p>How to change this put method, so that objects with same key will be placed together and not be overridden?</p>
  
  <pre><code>public static void put(String key, Object object) {
  
          getTestParameters().put(key, object);
  }
  </code></pre>