title: How to set empty string in JComboBox even if data available?
body: <p>I have a combo box. The values are populating in combo box from DB. But I want to display empty.</p>
  
  <p>Only when I selecting, it should be displayed in the drop down.</p>
  
  <p>Example:</p>
  
  <pre><code>Select Item:   
  ""
  Book
  Library
  Notebook
  Computer
  </code></pre>
  
  <p>Here Book, Library will come from database. But I need to display first time empty string. I have tried:</p>
  
  <pre><code>combo.setSelectedItem("");
  </code></pre>
  
  <p>But it's always displaying "Book" only.</p>
  
  <p>How would I do this?</p>