Simple Date Format Demo

       
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import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class SimpleDateFormatDemo extends JPanel {

  static JFrame frame;
  JLabel result;
  String currentPattern;
  Date today;
  LocaleGroup availableLocales;

  public SimpleDateFormatDemo() {

    today = new Date();
    availableLocales = new LocaleGroup();

    String[] patternExamples = { "dd MMMMM yyyy", "dd.MM.yy", "MM/dd/yy",
        "yyyy.MM.dd G 'at' hh:mm:ss z", "EEE, MMM d, ''yy", "h:mm a",
        "H:mm:ss:SSS", "K:mm a,z", "yyyy.MMMMM.dd GGG hh:mm aaa" };

    currentPattern = patternExamples[0];

    // 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("Current Date and Time", 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 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);
    localePanel.setAlignmentX(Component.CENTER_ALIGNMENT);
    resultPanel.setAlignmentX(Component.CENTER_ALIGNMENT);

    add(patternPanel);
    add(Box.createVerticalStrut(10));
    add(localePanel);
    add(Box.createVerticalStrut(10));
    add(resultPanel);

    setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

    reformat();

  } // 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 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;
    }
  }

  /** Formats and displays today's date. */
  public void reformat() {
    SimpleDateFormat formatter = new SimpleDateFormat(currentPattern,
        availableLocales.getCurrent());
    try {
      String dateString = formatter.format(today);
      result.setForeground(Color.black);
      result.setText(dateString);
    } catch (IllegalArgumentException iae) {
      result.setForeground(Color.red);
      result.setText("Error: " + iae.getMessage());
    }
  }

  public static void main(String s[]) {
    WindowListener l = new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    };

    frame = new JFrame("Date Formatting Demo");
    frame.addWindowListener(l);
    frame.getContentPane().add("Center", new SimpleDateFormatDemo());
    frame.pack();
    frame.setVisible(true);
  }
}

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Simple Date Format Demo : Date Format « Data Type « Java

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