title: Getting multiple datasets from JFreeChart
body: <p>I am using JFreeChart to have 2 datasets on the same graph. I am trying to do a comparison between how similar the points are on the graph and therefore I need access to the 2 datasets I put into the chart previously, but for some reason I can't seem to extract this information.</p>
  
  <p>Here is how the data is input:</p>
  
  <pre><code> private static IntervalXYDataset createDataset()
   {
       DefaultXYDataset completeDataset = new DefaultXYDataset();
  
       //populate with simulated data
       double[][] sim = new double[2][simData.size()];
       for(int i = 0; i &lt; simData.size(); i++){
           sim[0][i] = simData.get(i).getOne();
           sim[1][i] = simData.get(i).getTwo();
       }
  
       //populated with known experimental data         
       double[][] exp = new double[2][expData.size()];
       for(int i = 0; i &lt; expData.size(); i++){
           exp[0][i] = expData.get(i).getOne();
           exp[1][i] = expData.get(i).getTwo();
       }
  
       completeDataset.addSeries("Simulated", sim);
       completeDataset.addSeries("Experimental", exp);
  
       XYBarDataset dataset = new XYBarDataset(completeDataset, .1);
  
       return dataset; 
   }
  </code></pre>
  
  <p>The data is stored as a Pair initially, but this I know the data is input as the graph shows it correctly. How can I return the two series in this dataset?</p>