visual basic barcode program 9: Financial Applets and Servlets in Java

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9: Financial Applets and Servlets
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add(periodLab); add(periodText); add(rateLab); add(rateText); add(numWDLab); add(numWDText); add(initialLab); add(initialText); add(doIt); // Register to receive text field action events. regWDText.addActionListener(this); periodText.addActionListener(this); rateText.addActionListener(this); numWDText.addActionListener(this); doIt.addActionListener(this); nf = NumberFormat.getInstance(); nf.setMinimumFractionDigits(2); nf.setMaximumFractionDigits(2); } // User pressed Enter on a text field. public void actionPerformed(ActionEvent ae) { repaint(); } public void paint(Graphics g) { double result = 0.0; String String String String regWDStr = regWDText.getText(); periodStr = periodText.getText(); rateStr = rateText.getText(); numWDStr = numWDText.getText();
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try { if(regWDStr.length() != 0 && periodStr.length() != 0 && rateStr.length() != 0 && numWDStr.length() != 0) { regWDAmount = Double.parseDouble(regWDStr); numYears = Double.parseDouble(periodStr); rateOfRet = Double.parseDouble(rateStr) / 100; numPerYear = Integer.parseInt(numWDStr);
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result = compute(); initialText.setText(nf.format(result)); } showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); initialText.setText(""); } } // Compute the required initial investment. double compute() { double b, e; double t1, t2; t1 = (regWDAmount * numPerYear) / rateOfRet; b = (1 + rateOfRet/numPerYear); e = numPerYear * numYears; t2 = 1 - (1 / Math.pow(b, e)); return t1 * t2; } }
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The Annuity applet
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9: Financial Applets and Servlets
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Another annuity calculation computes the maximum annuity (in terms of a regular withdrawal) available from a given investment over a specified period of time. For example, if you have $500,000 in a retirement account, how much can you take out each month for 20 years, assuming a 6 percent rate of return The formula that computes the maximum withdrawal is shown here: Maximum Withdrawal = principal * ( ( (rateOfRet / wdPerYear) / wdPerYear * numYears ( 1 + ((rateOfRet / wdPerYear) + 1) ))+ (rateOfRet / wdPerYear) ) where rateOfRet specifies the rate of return, principal contains the value of the initial investment, wdPerYear specifies the number of withdrawals per year, and numYears specifies the length of the annuity in years. The MaxWD applet shown here computes the maximum periodic withdrawals that can be made over a specified length of time for an assumed rate of return. The applet produced by this program is shown in Figure 9-5.
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/* Compute the maximum annuity that can be withdrawn from an investment over a period of time. */ import java.awt.*; import java.awt.event.*; import java.applet.*; import java.text.*; /* <applet code="MaxWD" width=340 height=260> </applet> */ public class MaxWD extends Applet implements ActionListener { TextField maxWDText, orgPText, periodText, rateText, numWDText; Button doIt; double principal; double rateOfRet; double numYears; int numPerYear; NumberFormat nf; public void init() { // Use a grid bag layout. // // // // initial principal annual rate of return length of time in years number of withdrawals per year
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GridBagLayout gbag = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout(gbag); Label heading = new Label("Maximum Regular Withdrawals"); Label Label Label Label orgPLab = new Label("Original Principal"); periodLab = new Label("Years"); rateLab = new Label("Rate of Return"); numWDLab = new Label("Number of Withdrawals per Year"); Label maxWDLab = new Label("Maximum Withdrawal"); maxWDText = new TextField(16); periodText = new TextField(16); orgPText = new TextField(16); rateText = new TextField(16); numWDText = new TextField(16); // Max withdrawal field for display only. maxWDText.setEditable(false); doIt = new Button("Compute"); // Define the grid bag. gbc.weighty = 1.0; // use a row weight of 1 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(periodLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(periodText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(rateLab, gbc);
9: Financial Applets and Servlets
gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(rateText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(numWDLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(numWDText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(maxWDLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(maxWDText, gbc); gbc.anchor = GridBagConstraints.CENTER; gbag.setConstraints(doIt, gbc); // Add all the components. add(heading); add(orgPLab); add(orgPText); add(periodLab); add(periodText); add(rateLab); add(rateText); add(numWDLab); add(numWDText); add(maxWDLab); add(maxWDText); add(doIt); // Register to receive action events. orgPText.addActionListener(this); periodText.addActionListener(this); rateText.addActionListener(this); numWDText.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(); }
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