Delay

[Ramandeep]

Hi, does any one know if there is a delay function in Java you know like the one you get in Turbo Pascal

Delay (1000);

I don't want to write a loop which iterates for a long time to produce the delay because that speed depends on PC processor, and I want the speed to be consistent across different PCs

Also is there a beep feature in Java?

THANKS IN ADVANCE

[Dillinger4]

try using threads in your program.

The wait() and notify() methods are not of the thread
class but of the Object class. Every Java Object has
a lock associated with it. Every object can maintain a
list of waiting threads.


When a thread calls the wait() method of an Object, it is added to a list of waiting threads for that object and
stops running. When another thread calls the notify()
method of the same object() the object wakes up one
of the waiting threads and alloes it to continue running.

sleep can also be used:

public static void sleep(long millis) throws
InterruptedException;

public static void sleep(long millis, int nanos) throws InterruptedException;

[billrogers]

To get a beep you should need to get the toolkit, try this....


Toolkit.getDefaultToolkit().beep();

[Ramandeep]

Well I haven't got as far as thread yet. I new to Java so need somthing a bit simpler. The program I'm coding runs under the DOS command prompt and thus is not a GUI program so the answers I need have to work under DOS.

billrogers, I haven't as yet tried you answer but would it work under dos?

[Dillinger4]

As far as i know threads will run under DOS.


class threadtest{
public static void main(String[] args){

for(int i = 0; i <= 9; i++){
System.out.println("loop " + i);
}

Thread t = new sleeper();

try{
t.sleep(5000);
sleeper.imsleepy();

}catch(InterruptedException e) {System.err.println(e);}

}
}

class sleeper extends Thread{

public static void imsleepy(){
System.out.println("Im sleepy method just slept for 5 seconds!");
}
}

[Dillinger4]

you can also use the Timer and TimerTask class of the java.util package..

class TimerTest{
public static void main(String[] args){

// format the time
final java.text.DateFormat timeFmt = java.text.DateFormat.getTimeInstance(java.text.DateFormat.MEDIUM);

// define the time display task

TimerTask displayTime = new TimerTask(){
public void run() {System.out.println(timeFmt.format(new Date())); }
};

// create a timer object to run task

Timer timer = new Timer();
timer.schedule(displayTime, 0, 1000);

// to stop the time-display task

displayTime.cancel();
}
}

[parksie]

Java can't run under DOS without some severe trickery either.

[billrogers]

Java runs under dos just fine

[VirtuallyVB]

Do you mean a DOS shell from within Windows or a standalone DOS like version 6.2 or less? I have no problems developing from DOS, sometimes I prefer it to a full blown IDE, but I'm using a DOS shell from within Windows.

[parksie]

I mean actually booting into DOS, rather than DOS/Windows.

[billrogers]

why would you do that?? What do you gain from it?

[parksie]

I don't know. I was just giving factual answers to the question of whether Java would run under DOS.

[wey97]

You don't need all this code:

class threadtest{ 
public static void main(String[] args){ 

for(int i = 0; i <= 9; i++){ 
System.out.println("loop " + i); 
} 

Thread t = new sleeper(); 

try{ 
t.sleep(5000); 
sleeper.imsleepy(); 

}catch(InterruptedException e) {System.err.println(e);} 

} 
} 

class sleeper extends Thread{ 

public static void imsleepy(){ 
System.out.println("Im sleepy method just slept for 5 seconds!"); 
} 
}

Or all of this:

class TimerTest{ 
public static void main(String[] args){ 

// format the time 
final java.text.DateFormat timeFmt = java.text.DateFormat.getTimeInstance(java.text.DateFormat.MEDIUM); 

// define the time display task 

TimerTask displayTime = new TimerTask(){ 
public void run() {System.out.println(timeFmt.format(new Date())); } 
}; 

// create a timer object to run task 

Timer timer = new Timer(); 
timer.schedule(displayTime, 0, 1000); 

// to stop the time-display task 

displayTime.cancel(); 
} 
}

This is all you need:

try{Thread.sleep(1000);} 
catch (InterruptedException e){}

The program will pause for 1 sec.
In an applet or console (DOS) program.

[Dillinger4]

Yes while you are right........ The purpose was to show how the
java.util.Timer and java.utilTimerTask class work... We all know that a task can ususlly be accomplished with less code but it sometimes lacks a clear understanding.

[parksie]

Firstly, just re-read the thread from the top. The answer (sleep) was given very early on, and everything else was an explanation of using threads.

[Dillinger4]

No need to get upset...... Obviously he didnt ask how the java.util.Timer and java.util.TimerTask class work but what's so bad about pointing out another alternative? And since you obviously read the entire post to see that he didnt ask about the
"java.util.Timer and java.util.TimerTask classes" then you must of noticed that the answer sleep was given early on as parksie so kindly pointed out.