Results 1 to 4 of 4
  1. #1
    saytri is offline Member
    Join Date
    Dec 2007
    Posts
    34
    Rep Power
    0

    Default making a count down timer using java

    I need to do a count down timer using java. Anyone got any idea of how to do it or where to find information about doing it? Thanks a lot. I appreciate a lot the help. :-)

  2. #2
    CaptainMorgan's Avatar
    CaptainMorgan is offline Moderator
    Join Date
    Dec 2007
    Location
    NewEngland, US
    Posts
    835
    Rep Power
    10

    Default

    Without any timer specifics included in your post, check this timer out from Sun. Appears possible through using the Timer class.

  3. #3
    saytri is offline Member
    Join Date
    Dec 2007
    Posts
    34
    Rep Power
    0

    Default

    I am doing a quiz, and i want that the questions are answered with a specific amount of time eg: in 50seconds (I don't know if this is called a count down timer). If the user is unable to answer the questions in this amount of time it will issue a message saying "Time Out".

  4. #4
    feniger is offline Member
    Join Date
    Dec 2007
    Posts
    17
    Rep Power
    0

    Default

    Here is a Countdown example applet I have if it helps you in any way:

    import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.Timer; // not java.util.Timer
    import java.text.NumberFormat;
    import java.net.*;

    /**
    * An applet that counts down from a specified time. When it reaches 00:00,
    * it optionally plays a sound and optionally moves the browser to a new page.
    * Place the mouse over the applet to pause the count; move it off to resume.
    * This class demonstrates most applet methods and features.
    **/
    public class Countdown extends JApplet implements ActionListener, MouseListener
    {
    long remaining; // How many milliseconds remain in the countdown.
    long lastUpdate; // When count was last updated
    JLabel label; // Displays the count
    Timer timer; // Updates the count every second
    NumberFormat format; // Format minutes:seconds with leading zeros
    Image image; // Image to display along with the time
    AudioClip sound; // Sound to play when we reach 00:00

    // Called when the applet is first loaded
    public void init() {
    // Figure out how long to count for by reading the "minutes" parameter
    // defined in a <param> tag inside the <applet> tag. Convert to ms.
    String minutes = getParameter("minutes");
    if (minutes != null) remaining = Integer.parseInt(minutes) * 60000;
    else remaining = 600000; // 10 minutes by default

    // Create a JLabel to display remaining time, and set some properties.
    label = new JLabel();
    label.setHorizontalAlignment(SwingConstants.CENTER );
    label.setOpaque(true); // So label draws the background color

    // Read some parameters for this JLabel object
    String font = getParameter("font");
    String foreground = getParameter("foreground");
    String background = getParameter("background");
    String imageURL = getParameter("image");

    // Set label properties based on those parameters
    if (font != null) label.setFont(Font.decode(font));
    if (foreground != null) label.setForeground(Color.decode(foreground));
    if (background != null) label.setBackground(Color.decode(background));
    if (imageURL != null) {
    // Load the image, and save it so we can release it later
    image = getImage(getDocumentBase(), imageURL);
    // Now display the image in the JLabel.
    label.setIcon(new ImageIcon(image));
    }

    // Now add the label to the applet. Like JFrame and JDialog, JApplet
    // has a content pane that you add children to
    getContentPane().add(label, BorderLayout.CENTER);

    // Get an optional AudioClip to play when the count expires
    String soundURL = getParameter("sound");
    if (soundURL != null) sound=getAudioClip(getDocumentBase(), soundURL);

    // Obtain a NumberFormat object to convert number of minutes and
    // seconds to strings. Set it up to produce a leading 0 if necessary
    format = NumberFormat.getNumberInstance();
    format.setMinimumIntegerDigits(2); // pad with 0 if necessary

    // Specify a MouseListener to handle mouse events in the applet.
    // Note that the applet implements this interface itself
    addMouseListener(this);

    // Create a timer to call the actionPerformed() method immediately,
    // and then every 1000 milliseconds. Note we don't start the timer yet.
    timer = new Timer(1000, this);
    timer.setInitialDelay(0); // First timer is immediate.
    }

    // Free up any resources we hold; called when the applet is done
    public void destroy() { if (image != null) image.flush(); }

    // The browser calls this to start the applet running
    // The resume() method is defined below.
    public void start() { resume(); } // Start displaying updates

    // The browser calls this to stop the applet. It may be restarted later.
    // The pause() method is defined below
    public void stop() { pause(); } // Stop displaying updates

    // Return information about the applet
    public String getAppletInfo() {
    return "Countdown applet Copyright (c) 2003 by David Flanagan";
    }

    // Return information about the applet parameters
    public String[][] getParameterInfo() { return parameterInfo; }

    // This is the parameter information. One array of strings for each
    // parameter. The elements are parameter name, type, and description.
    static String[][] parameterInfo = {
    {"minutes", "number", "time, in minutes, to countdown from"},
    {"font", "font", "optional font for the time display"},
    {"foreground", "color", "optional foreground color for the time"},
    {"background", "color", "optional background color"},
    {"image", "image URL", "optional image to display next to countdown"},
    {"sound", "sound URL", "optional sound to play when we reach 00:00"},
    {"newpage", "document URL", "URL to load when timer expires"},
    };

    // Start or resume the countdown
    void resume() {
    // Restore the time we're counting down from and restart the timer.
    lastUpdate = System.currentTimeMillis();
    timer.start(); // Start the timer
    }

    // Pause the countdown
    void pause() {
    // Subtract elapsed time from the remaining time and stop timing
    long now = System.currentTimeMillis();
    remaining -= (now - lastUpdate);
    timer.stop(); // Stop the timer
    }

    // Update the displayed time. This method is called from actionPerformed()
    // which is itself invoked by the timer.
    void updateDisplay() {
    long now = System.currentTimeMillis(); // current time in ms
    long elapsed = now - lastUpdate; // ms elapsed since last update
    remaining -= elapsed; // adjust remaining time
    lastUpdate = now; // remember this update time

    // Convert remaining milliseconds to mm:ss format and display
    if (remaining < 0) remaining = 0;
    int minutes = (int)(remaining/60000);
    int seconds = (int)((remaining&#37;60000)/1000);
    label.setText(format.format(minutes) + ":" + format.format(seconds));

    // If we've completed the countdown beep and display new page
    if (remaining == 0) {
    // Stop updating now.
    timer.stop();
    // If we have an alarm sound clip, play it now.
    if (sound != null) sound.play();
    // If there is a newpage URL specified, make the browser
    // load that page now.
    String newpage = getParameter("newpage");
    if (newpage != null) {
    try {
    URL url = new URL(getDocumentBase(), newpage);
    getAppletContext().showDocument(url);
    }
    catch(MalformedURLException ex) { showStatus(ex.toString()); }
    }
    }
    }

    // This method implements the ActionListener interface.
    // It is invoked once a second by the Timer object
    // and updates the JLabel to display minutes and seconds remaining.
    public void actionPerformed(ActionEvent e) { updateDisplay(); }

    // The methods below implement the MouseListener interface. We use
    // two of them to pause the countdown when the mouse hovers over the timer.
    // Note that we also display a message in the statusline
    public void mouseEntered(MouseEvent e) {
    pause(); // pause countdown
    showStatus("Paused"); // display statusline message
    }
    public void mouseExited(MouseEvent e) {
    resume(); // resume countdown
    showStatus(""); // clear statusline
    }
    // These MouseListener methods are unused.
    public void mouseClicked(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    }
    have a good one - Day I mean...

Similar Threads

  1. Replies: 0
    Last Post: 04-04-2008, 02:46 PM
  2. Making connect 4 in java
    By zoe in forum New To Java
    Replies: 1
    Last Post: 08-07-2007, 06:10 AM
  3. Making a Java web calendar
    By toby in forum Enterprise JavaBeans (EJB)
    Replies: 1
    Last Post: 08-07-2007, 06:05 AM
  4. Help with timer in java
    By barney in forum Advanced Java
    Replies: 1
    Last Post: 08-01-2007, 10:24 AM
  5. Problem with timer in java
    By paul in forum Advanced Java
    Replies: 3
    Last Post: 07-26-2007, 10:18 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •