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gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(rateLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(rateText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(compLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(compText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(initialLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(initialText, gbc); gbc.anchor = GridBagConstraints.CENTER; gbag.setConstraints(doIt, gbc); // Add all the components. add(heading); add(targetLab); add(targetText); add(periodLab); add(periodText); add(rateLab); add(rateText); add(compLab); add(compText); add(initialLab); add(initialText); add(doIt); // Register to receive action events targetText.addActionListener(this); periodText.addActionListener(this); rateText.addActionListener(this); compText.addActionListener(this); doIt.addActionListener(this); nf = NumberFormat.getInstance(); nf.setMinimumFractionDigits(2); nf.setMaximumFractionDigits(2); } /* User pressed Enter on a text field or pressed Compute. */
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9: Financial Applets and Servlets
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public void actionPerformed(ActionEvent ae) { repaint(); } public void paint(Graphics g) { double result = 0.0; String String String String targetStr periodStr rateStr = compStr = = targetText.getText(); = periodText.getText(); rateText.getText(); compText.getText();
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try { if(targetStr.length() != 0 && periodStr.length() != 0 && rateStr.length() != 0 && compStr.length() != 0) { targetValue = Double.parseDouble(targetStr); numYears = Double.parseDouble(periodStr); rateOfRet = Double.parseDouble(rateStr) / 100; compPerYear = Integer.parseInt(compStr); 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; b = (1 + rateOfRet/compPerYear); e = compPerYear * numYears; return targetValue / Math.pow(b, e); } }
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Finding the Initial Investment Needed for a Desired Annuity
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Another common financial calculation computes the amount of money that one must invest so that a desired annuity, in terms of a regular withdrawal, can be paid. For example, you might decide that you need $5,000 per month at retirement and that you will need that amount for 20 years. The question is how much will you need to invest to secure that annuity The answer can be found using the following formula: Initial Investment = ((regWD * wdPerYear) / rateOfRet) * wdPerYear * numYears (1 (1 / (rateOfRet / wdPerYear + 1) )) where rateOfRet specifies the rate of return, regWD contains the desired regular withdrawal, wdPerYear specifies the number of withdrawals per year, and numYears specifies the length of the annuity in years. The Annuity applet shown here computes the initial investment required to produce the desired annuity. The applet produced by this program is shown in Figure 9-4.
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/* Compute the initial investment necessary for a desired annuity. In other words, find the initial amount needed to allow the regular withdrawals of a desired amount over a period of time. */ import java.awt.*; import java.awt.event.*; import java.applet.*; import java.text.*;
9: Financial Applets and Servlets
/* <applet code="Annuity" width=340 height=260> </applet> */ public class Annuity extends Applet implements ActionListener { TextField regWDText, initialText, periodText, rateText, numWDText; Button doIt; double regWDAmount; double rateOfRet; double numYears; int numPerYear; NumberFormat nf; public void init() { // Use a grid bag layout. GridBagLayout gbag = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout(gbag); Label heading = new Label("Initial Investment Needed for " + "Regular Withdrawals"); regWDLab = new Label("Desired Withdrawal"); periodLab = new Label("Years"); rateLab = new Label("Rate of Return"); numWDLab = new Label("Number of Withdrawals per Year "); Label initialLab = new Label("Initial Investment Required"); regWDText = new TextField(16); periodText = new TextField(16); initialText = new TextField(16); rateText = new TextField(16); numWDText = new TextField(16); // Initial investment field for display only. initialText.setEditable(false); Label Label Label Label // // // // amount of each withdrawal rate of return length of time in years number of withdrawals per year
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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(regWDLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(regWDText, 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); 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(initialLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(initialText, gbc); gbc.anchor = GridBagConstraints.CENTER; gbag.setConstraints(doIt, gbc); // Add all the components. add(heading); add(regWDLab); add(regWDText);
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