Java The Complete Reference, Seventh Edition

Chapter 32: Financial Applets and Servlets 949

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("Initial Investment Needed for " +

"Regular Withdrawals");

JLabel regWDLab = new JLabel("Desired Withdrawal ");

JLabel periodLab = new JLabel("Years ");

JLabel rateLab = new JLabel("Rate of Return ");

JLabel numWDLab =

new JLabel("Number of Withdrawals per Year ");

JLabel initialLab =

new JLabel("Initial Investment Required ");

regWDText = new JTextField(10);

periodText = new JTextField(10);

initialText = new JTextField(10);

rateText = new JTextField(10);

numWDText = new JTextField(10);

// Initial investment field for display only.

initialText.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(regWDLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;