Java The Complete Reference, Seventh Edition

Chapter 32: Financial Applets and Servlets 933

}
}

// 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("Compute Monthly Loan Payments");

JLabel amountLab = new JLabel("Principal ");

JLabel periodLab = new JLabel("Years ");

JLabel rateLab = new JLabel("Interest Rate ");

JLabel paymentLab = new JLabel("Monthly Payments ");

amountText = new JTextField(10);

periodText = new JTextField(10);

paymentText = new JTextField(10);

rateText = new JTextField(10);

// Payment field for display only.

paymentText.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);

// 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);

gbc.gridwidth = GridBagConstraints.RELATIVE;

gbag.setConstraints(rateLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(rateText, gbc);

gbc.gridwidth = GridBagConstraints.RELATIVE;

gbag.setConstraints(paymentLab, gbc);