Java The Complete Reference, Seventh Edition

946 Part IV: Applying Java

gbag.setConstraints(targetLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(targetText, 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(compLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(compText, gbc);

gbc.gridwidth = GridBagConstraints.RELATIVE;

gbag.setConstraints(initialLab, gbc);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbag.setConstraints(initialText, gbc);

gbc.anchor = GridBagConstraints.CENTER;

gbag.setConstraints(doIt, gbc);

// Add all the components.

add(heading);

add(targetLab);

add(targetText);

add(periodLab);

add(periodText);

add(rateLab);

add(rateText);

add(compLab);

add(compText);

add(initialLab);

add(initialText);

add(doIt);

// Register to receive action events.

targetText.addActionListener(this);

periodText.addActionListener(this);

rateText.addActionListener(this);

compText.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