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

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9: Financial Applets and Servlets
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// Use a grid bag layout. GridBagLayout gbag = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout(gbag); Label heading = new Label("Future Value of an Investment"); amountLab = new Label("Principal"); periodLab = new Label("Years"); rateLab = new Label("Rate of Return"); futvalLab = new Label("Future Value of Investment"); Label compLab = new Label("Compounding Periods per Year "); amountText periodText futvalText rateText = compText = = new TextField(16); = new TextField(16); = new TextField(16); new TextField(16); new TextField(16); Label Label Label Label
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// Future value field for display only. futvalText.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(amountLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(amountText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(periodLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(periodText, gbc);
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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(futvalLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(futvalText, gbc); gbc.anchor = GridBagConstraints.CENTER; gbag.setConstraints(doIt, gbc); add(heading); add(amountLab); add(amountText); add(periodLab); add(periodText); add(rateLab); add(rateText); add(compLab); add(compText); add(futvalLab); add(futvalText); add(doIt); // Register to receive action events. amountText.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 amountStr periodStr rateStr = compStr = = amountText.getText(); = periodText.getText(); rateText.getText(); compText.getText();
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try { if(amountStr.length() != 0 && periodStr.length() != 0 && rateStr.length() != 0 && compStr.length() != 0) { principal = Double.parseDouble(amountStr); numYears = Double.parseDouble(periodStr); rateOfRet = Double.parseDouble(rateStr) / 100; compPerYear = Integer.parseInt(compStr); result = compute(); futvalText.setText(nf.format(result)); } showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); futvalText.setText(""); } } // Compute the future value. double compute() { double b, e; b = (1 + rateOfRet/compPerYear); e = compPerYear * numYears; return principal * Math.pow(b, e); } }
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Finding the Initial Investment Required to Achieve a Future Value
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Sometimes you will want to know how large an initial investment is required to achieve some future value. For example, if you are saving for your child s college education and you know that you will need $75,000 in five years, how much money do you need to invest at 7 percent to reach that goal The InitInv applet developed here can answer that question. The formula to compute an initial investment is shown here: Initial Investment = targetValue / (((rateOfRet / compPerYear) + 1)
compPerYear * numYears
where rateOfRet specifies the rate of return, targetValue contains the starting balance, compPerYear specifies the number of compounding periods per year, and numYears specifies the length of the investment in years. If you use an annualized rate of return for rateOfRet, then the number of compounding periods is 1. The following applet called InitInv uses the preceding formula to compute the initial investment require to reach a desired future value. The applet produced by this program is shown in Figure 9-3.
/* Compute the initial investment necessary for a specified future value. */ import java.awt.*; import java.awt.event.*; import java.applet.*; import java.text.*; /* <applet code="InitInv" width=340 height=240> </applet> */ public class InitInv extends Applet implements ActionListener { TextField targetText, initialText, periodText, rateText, compText; Button doIt; double targetValue; double rateOfRet; double numYears; int compPerYear; NumberFormat nf; public void init() { // Use a grid bag layout. // // // // original target value rate of return length of loan in years number of compoundings per year
9: Financial Applets and Servlets
GridBagLayout gbag = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout(gbag); Label heading = new Label("Initial Investment Needed for " + "Future Value"); targetLab = new Label("Desired Future Value "); periodLab = new Label("Years"); rateLab = new Label("Rate of Return"); compLab = new Label("Compounding Periods per Year"); Label initialLab = new Label("Initial Investment Required"); targetText = new TextField(16); periodText = new TextField(16); initialText = new TextField(16); rateText = new TextField(16); compText = new TextField(16); // Initial value field for display only. initialText.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(targetLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(targetText, gbc); gbc.gridwidth = GridBagConstraints.RELATIVE; gbag.setConstraints(periodLab, gbc); gbc.gridwidth = GridBagConstraints.REMAINDER; gbag.setConstraints(periodText, gbc); Label Label Label Label
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