title: Formatting Double into a String in iReport
body: <p>I'm doing a report, that I need to join 4 variables in one.
  If I treat the variables separately I can format them with no problem.
  But when I merge them into a String, the double value comes as 0.0 instead of 0.00</p>
  
  <p>How can I make it comes as the original, 0.00?
  The code right now looks like this:</p>
  
  <pre><code>$F{someDoubleField} + "a string" + $F{anotherDoubleField} + "another string"
  </code></pre>
  
  <p>It prints:</p>
  
  <pre><code>0.0 a string 0.0 another string
  </code></pre>
  
  <p>instead of:</p>
  
  <pre><code>0.00 a string 0.00 another string
  </code></pre>
  
  <p>Remember that iReport uses Java, so maybe, Java code can help me out.</p>