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public void paint(Graphics g) { double result = 0.0; String String String String orgPStr = orgPText.getText(); periodStr = periodText.getText(); rateStr = rateText.getText(); numWDStr = numWDText.getText();
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try { if(orgPStr.length() != 0 && periodStr.length() != 0 && rateStr.length() != 0 && numWDStr.length() != 0) { principal = Double.parseDouble(orgPStr); numYears = Double.parseDouble(periodStr); rateOfRet = Double.parseDouble(rateStr) / 100; numPerYear = Integer.parseInt(numWDStr); result = compute(); maxWDText.setText(nf.format(result)); } showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); maxWDText.setText(""); } } // Compute the maximum regular withdrawals. double compute() { double b, e; double t1, t2; t1 = rateOfRet / numPerYear; b = (1 + t1); e = numPerYear * numYears; t2 = Math.pow(b, e) - 1; return principal * (t1/t2 + t1); } }
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9: Financial Applets and Servlets
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Figure 9-5
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Finding the Remaining Balance on a Loan
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Often you will want to know the remaining balance on a loan. This is easily calculated if you know the original principal, the interest rate, the loan length, and the number of payments made. To find the remaining balance, you must sum the payments, subtracting from each payment the amount allocated to interest, and then subtract that result from the principal. The RemBal applet, shown here, finds the remaining balance of a loan. The applet produced by this program is shown in Figure 9-6.
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// Find the remaining balance on a loan. import java.awt.*; import java.awt.event.*; import java.applet.*; import java.text.*; /* <applet code="RemBal" width=340 height=260> </applet> */ public class RemBal extends Applet implements ActionListener { TextField orgPText, paymentText, remBalText, rateText, numPayText;
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Button doIt; double double double double orgPrincipal; intRate; payment; numPayments; // // // // original principal interest rate amount of each payment number of payments made
/* Number of payments per year. You could allow this value to be set by the user. */ final int payPerYear = 12; NumberFormat nf; public void init() { // Use a grid bag layout. GridBagLayout gbag = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout(gbag); Label heading = new Label("Find Loan Balance "); Label Label Label Label Label orgPLab = new Label("Original Principal"); paymentLab = new Label("Amount of Payment"); numPayLab = new Label("Number of Payments Made"); rateLab = new Label("Interest Rate"); remBalLab = new Label("Remaining Balance");
orgPText = new TextField(16); paymentText = new TextField(16); remBalText = new TextField(16); rateText = new TextField(16); numPayText = new TextField(16); // Payment field for display only. remBalText.setEditable(false); doIt = new Button("Compute"); // Define the grid bag. gbc.weighty = 1.0; // use a row weight of 1
9: Financial Applets and Servlets
gbc.gridwidth = GridBagConstraints.REMAINDER; gbc.anchor = GridBagConstraints.NORTH; gbag.setConstraints(heading, gbc); // Anchor most components to the right. gbc.anchor = GridBagConstraints.EAST; gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(orgPLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(orgPText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(paymentLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(paymentText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(rateLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(rateText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(numPayLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(numPayText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(remBalLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(remBalText, gbc); gbc.anchor = GridBagConstraints.CENTER; gbag.setConstraints(doIt, gbc); // Add all the components. add(heading); add(orgPLab); add(orgPText); add(paymentLab); add(paymentText); add(numPayLab); add(numPayText);
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add(rateLab); add(rateText); add(remBalLab); add(remBalText); add(doIt); // Register to receive action events. orgPText.addActionListener(this); numPayText.addActionListener(this); rateText.addActionListener(this); paymentText.addActionListener(this); doIt.addActionListener(this); nf = NumberFormat.getInstance(); nf.setMinimumFractionDigits(2); nf.setMaximumFractionDigits(2); } /* User pressed Enter on a text field or pressed Compute. */ public void actionPerformed(ActionEvent ae) { repaint(); } public void paint(Graphics g) { double result = 0.0; String String String String orgPStr = orgPText.getText(); numPayStr = numPayText.getText(); rateStr = rateText.getText(); payStr = paymentText.getText();
try { if(orgPStr.length() != 0 numPayStr.length() != rateStr.length() != 0 payStr.length() != 0)
&& 0 && && {
orgPrincipal = Double.parseDouble(orgPStr); numPayments = Double.parseDouble(numPayStr); intRate = Double.parseDouble(rateStr) / 100; payment = Double.parseDouble(payStr);
9: Financial Applets and Servlets
result = compute(); remBalText.setText(nf.format(result)); } showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); remBalText.setText(""); } } // Compute the loan balance. double compute() { double bal = orgPrincipal; double rate = intRate / payPerYear; for(int i = 0; i < numPayments; i++) bal -= payment - (bal * rate); return bal; } }
Figure 9-6
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