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/**
* @version 1.10 1999-10-14
* @author Cay Horstmann
*/
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class NumberFormatTest {
public static void main(String[] args) {
JFrame frame = new NumberFormatFrame();
frame.show();
}
}
class NumberFormatFrame extends JFrame {
public NumberFormatFrame() {
setSize(400, 200);
setTitle("NumberFormatTest");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
getContentPane().setLayout(new GridBagLayout());
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
updateDisplay();
}
};
JPanel p = new JPanel();
addCheckBox(p, numberCheckBox, cbGroup, listener, true);
addCheckBox(p, currencyCheckBox, cbGroup, listener, false);
addCheckBox(p, percentCheckBox, cbGroup, listener, false);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.NONE;
gbc.anchor = GridBagConstraints.EAST;
add(new JLabel("Locale"), gbc, 0, 0, 1, 1);
add(p, gbc, 1, 1, 1, 1);
add(parseButton, gbc, 0, 2, 1, 1);
gbc.anchor = GridBagConstraints.WEST;
add(localeCombo, gbc, 1, 0, 1, 1);
gbc.fill = GridBagConstraints.HORIZONTAL;
add(numberText, gbc, 1, 2, 1, 1);
locales = NumberFormat.getAvailableLocales();
for (int i = 0; i < locales.length; i++)
localeCombo.addItem(locales[i].getDisplayName());
localeCombo.setSelectedItem(Locale.getDefault().getDisplayName());
currentNumber = 123456.78;
updateDisplay();
localeCombo.addActionListener(listener);
parseButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
String s = numberText.getText();
try {
Number n = currentNumberFormat.parse(s);
if (n != null) {
currentNumber = n.doubleValue();
updateDisplay();
} else {
numberText.setText("Parse error: " + s);
}
} catch (ParseException e) {
numberText.setText("Parse error: " + s);
}
}
});
}
public void add(Component c, GridBagConstraints gbc, int x, int y, int w,
int h) {
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = w;
gbc.gridheight = h;
getContentPane().add(c, gbc);
}
public void addCheckBox(Container p, JCheckBox checkBox, ButtonGroup g,
ActionListener listener, boolean v) {
checkBox.setSelected(v);
checkBox.addActionListener(listener);
g.add(checkBox);
p.add(checkBox);
}
public void updateDisplay() {
Locale currentLocale = locales[localeCombo.getSelectedIndex()];
currentNumberFormat = null;
if (numberCheckBox.isSelected())
currentNumberFormat = NumberFormat.getNumberInstance(currentLocale);
else if (currencyCheckBox.isSelected())
currentNumberFormat = NumberFormat
.getCurrencyInstance(currentLocale);
else if (percentCheckBox.isSelected())
currentNumberFormat = NumberFormat
.getPercentInstance(currentLocale);
String n = currentNumberFormat.format(currentNumber);
numberText.setText(n);
}
private Locale[] locales;
private double currentNumber;
private JComboBox localeCombo = new JComboBox();
private JButton parseButton = new JButton("Parse");
private JTextField numberText = new JTextField(30);
private JCheckBox numberCheckBox = new JCheckBox("Number");
private JCheckBox currencyCheckBox = new JCheckBox("Currency");
private JCheckBox percentCheckBox = new JCheckBox("Percent");
private ButtonGroup cbGroup = new ButtonGroup();
private NumberFormat currentNumberFormat;
}
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