title: How can I combine two HashMap objects containing the different types?
body: <p>I have two <code>HashMap</code> objects defined as:</p>
  
  <pre><code>Map&lt;String, String&gt; requestParams = new HashMap&lt;&gt;();
  Map&lt;String, Boolean&gt; requestParamForOauth = new HashMap&lt;&gt;();
  </code></pre>
  
  <p>How can I merge these two maps? </p>