gbc.gridwidth = GridBagConstraints.REMAINDER;
gbag.setConstraints(paymentText, gbc);
gbc.anchor = GridBagConstraints.CENTER;
gbag.setConstraints(doIt, gbc);
// Add all the components.
add(heading);
add(amountLab);
add(amountText);
add(periodLab);
add(periodText);
add(rateLab);
add(rateText);
add(paymentLab);
add(paymentText);
add(doIt);
// Register to receive action events.
amountText.addActionListener(this);
periodText.addActionListener(this);
rateText.addActionListener(this);
doIt.addActionListener(this);
// Create a number format.
nf = NumberFormat.getInstance();
nf.setMinimumFractionDigits(2);
nf.setMaximumFractionDigits(2);
}
/* User pressed Enter on a text field or
pressed Compute. Display the result if all
fields are completed. */
public void actionPerformed(ActionEvent ae) {
double result = 0.0;
String amountStr = amountText.getText();
String periodStr = periodText.getText();
String rateStr = rateText.getText();
try {
if(amountStr.length() != 0 &&
periodStr.length() != 0 &&
rateStr.length() != 0) {
principal = Double.parseDouble(amountStr);
numYears = Double.parseDouble(periodStr);
intRate = Double.parseDouble(rateStr) / 100;
result = compute();
paymentText.setText(nf.format(result));
}
showStatus(""); // erase any previous error message
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