A collection of formatted text fields and a button that displays the field values.
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Arrays;
import java.util.Date;
import java.util.StringTokenizer;
import javax.swing.InputVerifier;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultFormatter;
import javax.swing.text.DocumentFilter;
import javax.swing.text.InternationalFormatter;
import javax.swing.text.MaskFormatter;
/**
* A program to test formatted text fields
* @version 1.02 2007-06-12
* @author Cay Horstmann
*/
public class FormatTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
FormatTestFrame frame = new FormatTestFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A frame with a collection of formatted text fields and a button that displays the field values.
*/
class FormatTestFrame extends JFrame
{
public FormatTestFrame()
{
setTitle("FormatTest");
setSize(WIDTH, HEIGHT);
JPanel buttonPanel = new JPanel();
okButton = new JButton("Ok");
buttonPanel.add(okButton);
add(buttonPanel, BorderLayout.SOUTH);
mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout(0, 3));
add(mainPanel, BorderLayout.CENTER);
JFormattedTextField intField = new JFormattedTextField(NumberFormat.getIntegerInstance());
intField.setValue(new Integer(100));
addRow("Number:", intField);
JFormattedTextField intField2 = new JFormattedTextField(NumberFormat.getIntegerInstance());
intField2.setValue(new Integer(100));
intField2.setFocusLostBehavior(JFormattedTextField.COMMIT);
addRow("Number (Commit behavior):", intField2);
JFormattedTextField intField3 = new JFormattedTextField(new InternationalFormatter(
NumberFormat.getIntegerInstance())
{
protected DocumentFilter getDocumentFilter()
{
return filter;
}
private DocumentFilter filter = new IntFilter();
});
intField3.setValue(new Integer(100));
addRow("Filtered Number", intField3);
JFormattedTextField intField4 = new JFormattedTextField(NumberFormat.getIntegerInstance());
intField4.setValue(new Integer(100));
intField4.setInputVerifier(new FormattedTextFieldVerifier());
addRow("Verified Number:", intField4);
JFormattedTextField currencyField = new JFormattedTextField(NumberFormat
.getCurrencyInstance());
currencyField.setValue(new Double(10));
addRow("Currency:", currencyField);
JFormattedTextField dateField = new JFormattedTextField(DateFormat.getDateInstance());
dateField.setValue(new Date());
addRow("Date (default):", dateField);
DateFormat format = DateFormat.getDateInstance(DateFormat.SHORT);
format.setLenient(false);
JFormattedTextField dateField2 = new JFormattedTextField(format);
dateField2.setValue(new Date());
addRow("Date (short, not lenient):", dateField2);
try
{
DefaultFormatter formatter = new DefaultFormatter();
formatter.setOverwriteMode(false);
JFormattedTextField urlField = new JFormattedTextField(formatter);
urlField.setValue(new URL("http://java.sun.com"));
addRow("URL:", urlField);
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
try
{
MaskFormatter formatter = new MaskFormatter("###-##-####");
formatter.setPlaceholderCharacter('0');
JFormattedTextField ssnField = new JFormattedTextField(formatter);
ssnField.setValue("078-05-1120");
addRow("SSN Mask:", ssnField);
}
catch (ParseException exception)
{
exception.printStackTrace();
}
JFormattedTextField ipField = new JFormattedTextField(new IPAddressFormatter());
ipField.setValue(new byte[] { (byte) 130, 65, 86, 66 });
addRow("IP Address:", ipField);
}
/**
* Adds a row to the main panel.
* @param labelText the label of the field
* @param field the sample field
*/
public void addRow(String labelText, final JFormattedTextField field)
{
mainPanel.add(new JLabel(labelText));
mainPanel.add(field);
final JLabel valueLabel = new JLabel();
mainPanel.add(valueLabel);
okButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
Object value = field.getValue();
Class<?> cl = value.getClass();
String text = null;
if (cl.isArray())
{
if (cl.getComponentType().isPrimitive())
{
try
{
text = Arrays.class.getMethod("toString", cl).invoke(null, value)
.toString();
}
catch (Exception ex)
{
// ignore reflection exceptions
}
}
else text = Arrays.toString((Object[]) value);
}
else text = value.toString();
valueLabel.setText(text);
}
});
}
public static final int WIDTH = 500;
public static final int HEIGHT = 250;
private JButton okButton;
private JPanel mainPanel;
}
/**
* A filter that restricts input to digits and a '-' sign.
*/
class IntFilter extends DocumentFilter
{
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException
{
StringBuilder builder = new StringBuilder(string);
for (int i = builder.length() - 1; i >= 0; i--)
{
int cp = builder.codePointAt(i);
if (!Character.isDigit(cp) && cp != '-')
{
builder.deleteCharAt(i);
if (Character.isSupplementaryCodePoint(cp))
{
i--;
builder.deleteCharAt(i);
}
}
}
super.insertString(fb, offset, builder.toString(), attr);
}
public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)
throws BadLocationException
{
if (string != null)
{
StringBuilder builder = new StringBuilder(string);
for (int i = builder.length() - 1; i >= 0; i--)
{
int cp = builder.codePointAt(i);
if (!Character.isDigit(cp) && cp != '-')
{
builder.deleteCharAt(i);
if (Character.isSupplementaryCodePoint(cp))
{
i--;
builder.deleteCharAt(i);
}
}
}
string = builder.toString();
}
super.replace(fb, offset, length, string, attr);
}
}
/**
* A verifier that checks whether the content of a formatted text field is valid.
*/
class FormattedTextFieldVerifier extends InputVerifier
{
public boolean verify(JComponent component)
{
JFormattedTextField field = (JFormattedTextField) component;
return field.isEditValid();
}
}
/**
* A formatter for 4-byte IP addresses of the form a.b.c.d
*/
class IPAddressFormatter extends DefaultFormatter
{
public String valueToString(Object value) throws ParseException
{
if (!(value instanceof byte[])) throw new ParseException("Not a byte[]", 0);
byte[] a = (byte[]) value;
if (a.length != 4) throw new ParseException("Length != 4", 0);
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 4; i++)
{
int b = a[i];
if (b < 0) b += 256;
builder.append(String.valueOf(b));
if (i < 3) builder.append('.');
}
return builder.toString();
}
public Object stringToValue(String text) throws ParseException
{
StringTokenizer tokenizer = new StringTokenizer(text, ".");
byte[] a = new byte[4];
for (int i = 0; i < 4; i++)
{
int b = 0;
if (!tokenizer.hasMoreTokens()) throw new ParseException("Too few bytes", 0);
try
{
b = Integer.parseInt(tokenizer.nextToken());
}
catch (NumberFormatException e)
{
throw new ParseException("Not an integer", 0);
}
if (b < 0 || b >= 256) throw new ParseException("Byte out of range", 0);
a[i] = (byte) b;
}
if (tokenizer.hasMoreTokens()) throw new ParseException("Too many bytes", 0);
return a;
}
}
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