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copied!<p>Thanks for the help. I started with trying to use the first response, but I couldn't get the bar to run concurrently, and it ran when the program finished. I'm sure it would work, but I wasn't able to figure it out. Using trashgod's response and some other examples, I was able to get it to work using <code>SwingWorker</code>. Unfortunately, I don't totally understand how it works, but I'll take it for now.</p> <p>The gui and method to run the calculations are called in another class first:</p> <pre><code>iterations = (int) (MPay - (M1Start + M2Start)); twoLoan myLoan = new twoLoan(); myLoan.createGui(iterations); myLoan.runCalcs(MPay, Step, L1, L2, C1, C2, IM1, IM2, M1Start, M2Start); </code></pre> <p>Then it runs as follows:</p> <pre><code>public class twoLoan extends JFrame { JFrame progressFrame; JProgressBar progressBar; JLabel label = new JLabel("Calculating...");; Container pane; double amountSaved = 0; int i = 0; int iterations; public void createGui(int iterations) { //Create all components progressFrame = new JFrame("Calculation Progress"); progressFrame.setSize(300, 100); pane = progressFrame.getContentPane(); pane.setLayout(null); label = new JLabel("Calculating..."); label.setBounds(115, 35, 200, 25); progressBar = new JProgressBar(0, iterations); progressBar.setBounds(10, 10, 280, 20); progressBar.setStringPainted(true); //Add components to pane pane.add(progressBar); pane.add(label); //Make frame visible progressFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); progressFrame.setResizable(false); //No resize progressFrame.setLocationRelativeTo(null); progressFrame.setVisible(true); } public void runCalcs (double MP, double StepAmt, double L1, double L2, double C1, double C2, double IM1, double IM2, double M1Start, double M2Start) { progressBar.setIndeterminate(false); TwoWorker task = new TwoWorker(MP, StepAmt, L1, L2, C1, C2, IM1, IM2, M1Start, M2Start); task.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent e) { if ("progress".equals(e.getPropertyName())) { progressBar.setIndeterminate(false); progressBar.setValue((Integer) e.getNewValue()); } } }); task.execute(); } //end method runCalcs public class TwoWorker extends SwingWorker<Double, Double> { private final double MP, StepAmt,L1, L2, C1, C2, IM1, IM2, M1Start, M2Start; public TwoWorker(double MPa, double StepAmta, double L1a, double L2a, double C1a, double C2a, double IM1a, double IM2a, double M1Starta, double M2Starta) { MP = MPa; StepAmt = StepAmta; L1 = L1a; L2 = L2a; C1 = C1a; C2 = C2a; IM1 = IM1a; IM2 = IM2a; M1Start = M1Starta; M2Start = M2Starta; } @Override protected Double doInBackground() { 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 <= MP - M2Start && M2 >= 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 < minLoop) { minLoop = MTotal; MP1 = M1; MP2 = M2; NP1 = N1; NP2 = N2; MP1Sum = M1Sum; MP2Sum = M2Sum; } // end if i++; progressBar.setValue(i); M1 = M1 + StepAmt; M2 = MP - M1; // Reset monthly sums M1Sum = 0; M2Sum = 0; } // end while System.out.printf("MP1 = %.2f\n", MP1); System.out.printf("MP2 = %.2f\n", MP2); System.out.printf("NP1 = %.2f\n", NP1); System.out.printf("NP2 = %.2f\n", NP2); System.out.printf("MP1Sum = %.2f\n", MP1Sum); System.out.printf("MP2Sum = %.2f\n", MP2Sum); System.out.printf("MTotal = %.2f\n", minLoop); System.out.printf("i = %d\n",i); System.out.printf("M1Start = %.2f\n", M1Start); System.out.printf("M2Start = %.2f\n", M2Start); System.out.printf("MP= %.2f\n",MP); // if there's a value for current payments, calculate amount saved if( C1 > 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 if return null; } // end doInBackGround @Override protected void done() { label.setBounds(133, 35, 200, 25); label.setText("Done!"); } } // end TwoWorker public double savedReturn() { return amountSaved; } } // end class twoLoans </code></pre>

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