title: Storing map in properties file
body: <p>I know that I can build a Map as below.</p>
  
  <pre><code>private static final ImmutableMap&lt;String,String&gt; WordMap = 
  ImmutableMap.&lt;String, String&gt;builder()
  .put("blah", "blahblah").put("blabla", "blahblahblah").build()
  </code></pre>
  
  <p>I'd like to store the values of my map in a config file.
  I'm already storing the values for a different hashset in the config file by doing
  <code>values=value1,value2,value3</code> and then<br>
  <code>new HashSet&lt;String&gt;(Arrays.asList(prop.getProperty(values).split(",")))</code></p>
  
  <p>I'd like to do something similar for my map. 
  Any tips?
  I'm using <code>java.util.Properties</code></p>