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Read a file of reminders, sleep until each is due, beep. Java code example - Click here to copy ->>>
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/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*/
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*/
import java.io.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
/**
* Read a file of reminders, sleep until each is due, beep.
* Much of this logic has been uperceded by java.util.Timer, which is used
* in the non-Old version of this program.
* @author Ian F. Darwin, http://www.darwinsys.com/
* @version $Id: ReminderServiceOld.java,v 1.2 2004/02/09 03:33:46 ian Exp $
*/
public class ReminderServiceOld {
class Item {
Date due;
String message;
Item(Date d, String m) {
due = d;
message = m;
}
}
ArrayList l = new ArrayList();
public static void main(String[] argv) throws IOException {
ReminderServiceOld rs = new ReminderServiceOld();
rs.load();
rs.run();
}
protected void load() throws IOException {
BufferedReader is = new BufferedReader(
new FileReader("ReminderService.txt"));
SimpleDateFormat formatter =
new SimpleDateFormat ("yyyy MM dd hh mm");
String aLine;
while ((aLine = is.readLine()) != null) {
ParsePosition pp = new ParsePosition(0);
Date date = formatter.parse(aLine, pp);
if (date == null) {
message("Invalid date in " + aLine);
continue;
}
String mesg = aLine.substring(pp.getIndex());
l.add(new Item(date, mesg));
}
}
public void run() {
System.out.println("ReminderServiceOld: Starting at " + new Date());
while (!l.isEmpty()) {
Date d = new Date();
Item i = (Item)l.get(0);
long interval = i.due.getTime() - d.getTime();
if (interval > 0) {
System.out.println("Sleeping until " + i.due);
try {
Thread.sleep(interval);
} catch (InterruptedException e) {
System.exit(1); // unexpected intr
}
message(i.due + ": " + i.message);
} else
message("MISSED " + i.message + " at " + i.due);
l.remove(0);
}
System.exit(0);
}
void message(String message) {
System.out.println("\007" + message);
JOptionPane.showMessageDialog(null,
message,
"Timer Alert", // titlebar
JOptionPane.INFORMATION_MESSAGE); // icon
}
}
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References.
The list of classes which were used on this page you can find below. The
links to Java API contain official SUN documentation about all used classes.
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