title: Can a progress bar be used in a class outside main?
body: <p>Right now, my main just calls a gui with 10 rows.  Based on how many of those rows have text, 1 of 9 classes is called (two rows must have text).  The called class performs calculations that I'd like to have the progress bar tied to.  Here is an example of one of the called classes (each class is similar, but different enough to warrant a new class.)  I believe the problem is a violation of EDT rules, but all the examples I've seen on them involve a main argument.  The frame appears when the code is run, but the progress bar doesn't update until all calculations are completed.</p>
  
  <pre><code>import java.awt.*;
  import java.awt.event.*;
  import javax.swing.*;
  
  public class twoLoan extends JFrame {
  
      static JFrame progressFrame;
      static JProgressBar progressBar;
      static Container pane;
      double amountSaved = 0;
      int i = 0;
  
      public void runCalcs(Double MP, Double StepAmt,
          Double L1, Double L2, Double C1, Double C2,
          Double IM1, Double IM2, Double M1Start, Double M2Start) {
  
          try {
              UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          } catch (Exception e) {
          }
  
          int iterations = (int) (MP - (M1Start * M2Start));
  
          //Create all components
          progressFrame = new JFrame("Calculation Progress");
          progressFrame.setSize(300, 100);
          pane = progressFrame.getContentPane();
          pane.setLayout(null);
          progressFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          progressBar = new JProgressBar(0, iterations);
  
          //Add components to pane
          pane.add(progressBar);
  
          //Position controls (X, Y, width, height)
          progressBar.setBounds(10, 10, 280, 20);
  
          //Make frame visible
          progressFrame.setResizable(false); //No resize
          progressFrame.setVisible(true);
  
          double M1 = M1Start;
          double M2 = M2Start;
  
          // Set MinLoop as maximum to start
          // Loan 1
          double N1 = (Math.log10(1 - IM1 * L1 / M1) * -1) / Math.log10(1 + IM1);
          double M1Sum = M1 * N1;
          // Loan 2
          double N2 = (Math.log10(1 - IM2 * L2 / M2) * -1) / Math.log10(1 + IM2);
          double M2Sum = M2 * N2;
          double minLoop = M1Sum + M2Sum;
          double MTotal = 0;
  
  
          // Define variables for mins
          double MP1 = 0;
          double MP2 = 0;
          double NP1 = 0;
          double NP2 = 0;
          double MP1Sum = 0;
          double MP2Sum = 0;
  
          while (M1 &lt;= MP - M2Start &amp;&amp; M2 &gt;= M2Start) {
              N1 = (Math.log10(1 - IM1 * L1 / M1) * -1) / Math.log10(1 + IM1);
              M1Sum = N1 * M1;
              N2 = (Math.log10(1 - IM2 * L2 / M2) * -1) / Math.log10(1 + IM2);
              M2Sum = N2 * M2;
              MTotal = M1Sum + M2Sum;
              if (MTotal &lt; minLoop) {
                  minLoop = MTotal;
                  MP1 = M1;
                  MP2 = M2;
                  NP1 = N1;
                  NP2 = N2;
                  MP1Sum = M1Sum;
                  MP2Sum = M2Sum;
              } // end if
              M1 = M1 + StepAmt;
              M2 = MP - M1;
              // Reset monthly sums
              M1Sum = 0;
              M2Sum = 0;
              i++;
              progressBar.setValue(i);
              progressBar.repaint();
              if (i &gt;= iterations) {
                  progressFrame.dispose();
              }
          } // end while
  
          // if there's a value for current payments, calculate amount saved
          if (C1 &gt; 0) {
              double CN1 = (Math.log10(1 - IM1 * L1 / C1) * -1) / Math.log10(1 + IM1);
              double CT1 = CN1 * C1;
  
              double CN2 = (Math.log10(1 - IM2 * L2 / C2) * -1) / Math.log10(1 + IM2);
              double CT2 = CN2 * C2;
  
              double CTotal = CT1 + CT2;
              amountSaved = CTotal - minLoop;
          }
  
      } // end method runCalcs
  
      //Workbook wb = new HSSFWorkbook();
      public double savedReturn() {
          return amountSaved;
      }
  } // end class twoLoans  
  </code></pre>