//
//
// Countdown Applet
//
// Counts down to a paricular time/date
//
// Written by : David Reilly
// Release details : Public domain source/binary
// Last modification date : November 21, 1997
//
import java.applet.*;
import java.awt.*;
import java.util.Date;
// Countdown class
public class Countdown extends Applet implements Runnable
{
// m_Countdown is the Thread object for the applet
private Thread m_Countdown = null;
// m_Date is the date to which applet will countdown
private Date m_Date;
// String which shall be displayed to user
private String countString;
// PARAMETER SUPPORT:
private String m_CountdownDate = "January 1, 2000";
private final String PARAM_CountdownDate = "CountdownDate";
// Countdown Class Constructor
public Countdown()
{
super();
}
// Returns applet information
public String getAppletInfo()
{
return "Name: Countdown\r\n" +
"Author: David Reilly\r\n" +
"Created with Microsoft Visual J++ Version 1.1";
}
// PARAMETER SUPPORT
// The getParameterInfo() method returns an array of strings describing
// the parameters understood by this applet.
public String[][] getParameterInfo()
{
String[][] info =
{
{ PARAM_CountdownDate, "String", "Date to which applet will countdown" },
};
return info;
}
// Initialise applet
public void init()
{
// The following code retrieves the value of each parameter
// specified with the tag and stores it in a member
// variable.
String param;
// CountdownDate: Date to which applet will countdown
param = getParameter(PARAM_CountdownDate);
if (param != null)
m_CountdownDate = param;
// Calculate date
m_Date = new Date(m_CountdownDate);
// Set background to white
setBackground(Color.white);
// Set foreground to red
setForeground(Color.red);
// Set font
setFont ( new Font("Arial", Font.PLAIN, 15) );
// Resize if available
resize(300, 100);
// Start new thread to calculate date
start();
}
// Countdown Paint Handler
public void paint(Graphics g)
{
FontMetrics fm = g.getFontMetrics();
int strWidth = fm.stringWidth(countString);
int appletWidth = size().width;
g.drawString(countString, (appletWidth - strWidth) / 2, 20);
}
// Start method to launch thread
public void start()
{
// Check to see if thread still active
if (m_Countdown == null)
{
// Create new thread
m_Countdown = new Thread(this);
// Start thread
m_Countdown.start();
}
}
// Stop method to stop thread
public void stop()
{
// Check to see if thread still active
if (m_Countdown != null)
{
// Stop thread
m_Countdown.stop();
// Clear thread, so garbage collection can "clean up"
m_Countdown = null;
}
}
// Run method to recalculate the countdown string
public void run()
{
for (;;)
{
try
{
Date currentDate = new Date();
if (m_Date.after(currentDate))
{
// Calculate difference in dates
long numericalDifference = m_Date.getTime() - currentDate.getTime();
// Divide by 1000 to find number of seconds difference
numericalDifference = numericalDifference / 1000;
// Get seconds
int seconds = (int) numericalDifference % 60;
// Get minutes
numericalDifference = numericalDifference / 60;
int minutes = (int) numericalDifference % 60;
// Get hours
numericalDifference = numericalDifference / 60;
int hours = (int) numericalDifference % 24;
// Get days
numericalDifference = numericalDifference / 24;
int days = (int) numericalDifference % 365;
// Get days
numericalDifference = numericalDifference / 365;
int years = (int) numericalDifference;
// Generate date string
countString = seconds + " seconds, " +
minutes + " minutes, " +
hours + " hours, " +
days + " days, " +
years + " years remain until target.";
}
else
countString = "Countdown reached!";
// Repaint applet canvas
repaint();
// Sleep for a second
Thread.sleep(1000);
}
catch (InterruptedException e)
{
// If we're interrupted, then stop thread
stop();
}
}
}
}
