double principal;
//
original principal
double rateOfRet;
//
rate of return
double numYears;
//
length of investment in years
int compPerYear;
//
number of compoundings per year
NumberFormat nf;
public void init() {
try {
SwingUtilities.invokeAndWait(new Runnable () {
public void run() {
makeGUI(); // initialize the GUI
}
});
} catch(Exception exc) {
System.out.println("Can't create because of "+ exc);
}
}
// Set up and initialize the GUI.
private void makeGUI() {
// Use a grid bag layout.
GridBagLayout gbag = new GridBagLayout();
GridBagConstraints gbc = new GridBagConstraints();
setLayout(gbag);
JLabel heading = new
JLabel("Future Value of an Investment");
JLabel
amountLab = new JLabel("Principal ");
JLabel
periodLab = new JLabel("Years ");
JLabel
rateLab = new JLabel("Rate of Return ");
JLabel
futvalLab =
new JLabel("Future Value of Investment ");
JLabel compLab =
new JLabel("Compounding Periods per Year ");
amountText
= new JTextField(10);
periodText
= new JTextField(10);
futvalText
= new JTextField(10);
rateText =
new JTextField(10);
compText =
new JTextField(10);
// Future value field for display only.
futvalText.setEditable(false);
doIt = new JButton("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);
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