/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.applet.Applet;import java.awt.*;import java.awt.event.*;import com.sun.java.swing.*;import com.sun.java.swing.border.*;import java.util.*;import java.text.*;public class DecimalFormatDemo extends JPanel {    static JFrame frame;    JLabel result;    NumberFormat inputFormatter;    String currentPattern;    double currentNumber = 123.45;    LocaleGroup availableLocales;    public DecimalFormatDemo() {         availableLocales = new LocaleGroup();        inputFormatter = NumberFormat.getNumberInstance();              String[] patternExamples = {                  "##.##",                  "###,###.##",                 "##,##,##.##",                 "#",                 "000,000.0000",                 "##.0000",                 "'hello'###.##"                 };        currentPattern = patternExamples[0];        // Set up the UI for entering a number.        JLabel numberLabel = new JLabel("Enter the number to format:");        numberLabel.setAlignmentX(Component.LEFT_ALIGNMENT);        JTextField numberField = new JTextField();        numberField.setEditable(true);        numberField.setAlignmentX(Component.LEFT_ALIGNMENT);        NumberListener numberListener = new NumberListener();        numberField.addActionListener(numberListener);           // Set up the UI for selecting a pattern.        JLabel patternLabel1 = new JLabel("Enter the pattern string or");        JLabel patternLabel2 = new JLabel("select one from the list:");        patternLabel1.setAlignmentX(Component.LEFT_ALIGNMENT);        patternLabel2.setAlignmentX(Component.LEFT_ALIGNMENT);            JComboBox patternList = new JComboBox(patternExamples);        patternList.setSelectedIndex(0);        patternList.setEditable(true);        patternList.setAlignmentX(Component.LEFT_ALIGNMENT);        PatternListener patternListener = new PatternListener();        patternList.addActionListener(patternListener);         // Set up the UI for selecting a locale.        JLabel localeLabel = new JLabel("Select a Locale from the list:");        localeLabel.setAlignmentX(Component.LEFT_ALIGNMENT);        JComboBox localeList = new JComboBox(availableLocales.getStrings());        localeList.setSelectedIndex(0);        localeList.setAlignmentX(Component.LEFT_ALIGNMENT);        LocaleListener localeListener = new LocaleListener();        localeList.addActionListener(localeListener);        // Create the UI for displaying result.        JLabel resultLabel = new JLabel("Result", JLabel.LEFT);        resultLabel.setAlignmentX(Component.LEFT_ALIGNMENT);        result = new JLabel(" ");        result.setForeground(Color.black);        result.setAlignmentX(Component.LEFT_ALIGNMENT);        result.setBorder(BorderFactory.createCompoundBorder(             BorderFactory.createLineBorder(Color.black),             BorderFactory.createEmptyBorder(5,5,5,5)        ));            // Lay out everything        JPanel numberPanel = new JPanel();        numberPanel.setLayout(new GridLayout(0, 1));        numberPanel.add(numberLabel);        numberPanel.add(numberField);            JPanel patternPanel = new JPanel();        patternPanel.setLayout(new BoxLayout(patternPanel, BoxLayout.Y_AXIS));        patternPanel.add(patternLabel1);        patternPanel.add(patternLabel2);        patternPanel.add(patternList);        JPanel localePanel = new JPanel();        localePanel.setLayout(new BoxLayout(localePanel, BoxLayout.Y_AXIS));        localePanel.add(localeLabel);        localePanel.add(localeList);        JPanel resultPanel = new JPanel();        resultPanel.setLayout(new GridLayout(0, 1));        resultPanel.add(resultLabel);        resultPanel.add(result);            setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));        patternPanel.setAlignmentX(Component.CENTER_ALIGNMENT);        numberPanel.setAlignmentX(Component.CENTER_ALIGNMENT);        localePanel.setAlignmentX(Component.CENTER_ALIGNMENT);        resultPanel.setAlignmentX(Component.CENTER_ALIGNMENT);            add(numberPanel);        add(Box.createVerticalStrut(10));        add(patternPanel);        add(Box.createVerticalStrut(10));        add(localePanel);        add(Box.createVerticalStrut(10));        add(resultPanel);            setBorder(BorderFactory.createEmptyBorder(10,10,10,10));           reformat();        numberField.setText(result.getText());    } // constructor    /** Listens to the pattern combo box. */    class PatternListener implements ActionListener {         public void actionPerformed(ActionEvent e) {        JComboBox cb = (JComboBox)e.getSource();        String newSelection = (String)cb.getSelectedItem();        currentPattern = newSelection;        reformat();        }    }    /** Listens to the number field. */    class NumberListener implements ActionListener {         public void actionPerformed(ActionEvent evt) {           JTextField inputField = (JTextField)evt.getSource();           try {              Number value = inputFormatter.parse(inputField.getText());              currentNumber = value.doubleValue();              reformat();           }           catch (ParseException pe) {              result.setForeground(Color.red);              result.setText("Illegal Number: " + pe.getMessage());           }        }    }    /** Listens to the locale combo box. */    class LocaleListener implements ActionListener {        public void actionPerformed(ActionEvent e) {        JComboBox cb = (JComboBox)e.getSource();        int index = cb.getSelectedIndex();        availableLocales.setCurrent(index);        reformat();        }    }    /** Manages information about locales for this application. */    class LocaleGroup {        Locale currentLocale;        Locale[] supportedLocales = {           Locale.US,            Locale.GERMANY,            Locale.FRANCE           // Add other locales here, if desired.        };        public LocaleGroup() {           currentLocale = supportedLocales[0];           }         public void setCurrent(int index) {           currentLocale = supportedLocales[index];        }        public Locale getCurrent() {           return currentLocale;        }        public String[] getStrings() {           String[] localeNames = new String[supportedLocales.length];           for (int k = 0; k < supportedLocales.length; k++) {              localeNames[k] = supportedLocales[k].getDisplayName();           }           return localeNames;        }    }    /** Reformats the input number and displays result. */    public void reformat() {         try {             NumberFormat nf =                 NumberFormat.getNumberInstance(availableLocales.getCurrent());             DecimalFormat df = (DecimalFormat)nf;             df.applyPattern(currentPattern);             result.setForeground(Color.black);             result.setText(df.format(currentNumber));         }         catch (IllegalArgumentException iae) {             result.setForeground(Color.red);             result.setText("Illegal Pattern: " + iae.getMessage());         }    }    public static void main(String s[]) {         WindowListener l = new WindowAdapter() {             public void windowClosing(WindowEvent e) {System.exit(0);}         };          frame = new JFrame("DecimalFormat Demo");         frame.addWindowListener(l);         frame.getContentPane().add("Center", new DecimalFormatDemo());         frame.pack();         frame.setVisible(true);    }}