Java The Complete Reference, Seventh Edition

954 Part IV: Applying Java

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(numWDLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(numWDText, gbc);

gbc.gridwidth = GridBagConstraints.RELATIVE;

gbag.setConstraints(maxWDLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(maxWDText, gbc);

gbc.anchor = GridBagConstraints.CENTER;

gbag.setConstraints(doIt, gbc);

// Add all the components.

add(heading);

add(orgPLab);

add(orgPText);

add(periodLab);

add(periodText);

add(rateLab);

add(rateText);

add(numWDLab);

add(numWDText);

add(maxWDLab);

add(maxWDText);

add(doIt);

// Register to receive action events.

orgPText.addActionListener(this);

periodText.addActionListener(this);

rateText.addActionListener(this);

numWDText.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;