How can I make a java program wait X seconds without usingThread.sleep?
public class newClass{
public static void main(String[] args){
for(int i = 0; i < 10; i++){
//Wait X second
System.out.println("Hello");
}
}
}
Thanks for any help!!
I need the program won't freeze while it's counting
You can use Java's Timer and TimerTask class for this.
import java.util.Timer;
import java.util.TimerTask;
public class newClass extends TimerTask{
int i = 10;
static Timer timer;
@Override
public void run(){
System.out.println("hello");
i--;
if (i == 0)
timer.cancel();
}
public static void main(String[] args){
TimerTask timerTask = new newClass();
timer = new Timer(false);
timer.scheduleAtFixedRate(timerTask, 0, 5 * 1000);
}
}
And Timer works on its own thread in the background so it won't freeze up the rest of your program!
If your issue is that you do not want your program to freeze, consider using threads. This example might be similar to what you want to achieve: http://docs.oracle.com/javase/tutorial/essential/concurrency/simple.html.
It is a bad approach but you can use this:
public class newClass{
public static void main(String[] args){
int X = 5;
for(int i = 0; i < 10; i++){
long s = System.nanoTime();
while( (System.nanoTime() - s) / 1000000000 < X);
System.out.println("Hello");
}
}
}
You can also use
System.currentTimeMillis()
sleep() or wait() commands, so this is only a bad trick.What you are really looking for is a multi-thread implementation. That is what will allow you to continue interacting with one area of the application while waiting for another to finish processing.
Edit Ok, after further clarification in the comments, sounds like this is not what you are looking for. Perhaps you can register each child in a HashMap with the time that they started. Then monitor the map to see when time is up.
Seems like you want your program to start, and after X time has elapsed print "Hello" on the output stream?
Both options will give you exactly the same result, although option 2 is preferred, since you allow the CPU to do something else while your main thread is sleeping, and because using option 1 makes your intention with the program less clear.
wait()to benotifiedby whom?sleepdoes. So what is your issue?