title: How to write and read a file with a HashMap?
body: <p>I have a <code>HashMap</code> with two Strings <code>Map&lt;String, String&gt; ldapContent = new HashMap&lt;String, String&gt;</code>.</p>
  
  <p>Now I want to save the <code>Map</code> in an external file to use the <code>Map</code> later without initializing it again...</p>
  
  <p>So how must I save the <code>Map</code> to use it later again?</p>