title: HashMap<String, Object> How to replace 1 value of the Object?
body: <pre><code>Map&lt;String, Data&gt; map = new HashMap&lt;String,Data&gt;();
  map.put("jan", new Data("RED","M4A1",5,0,0));
  </code></pre>
  
  <p>How can I change the value RED of the Data object?, without getting all the information out of the map with the key and putting it back in, like this:</p>
  
  <pre><code>map.put("jan" new Data("Blue",
        map.get("jan").Brand,
        map.get("jan").Storage,
        map.get("jan").Sold,
        map.get("jan").Bought)); 
  </code></pre>
  
  <p>So how can i change 1 value of the Data Object instead of redo them all?</p>