Basic query in JAVA Threads....Please reply !!

Question

I have a class (say ABC) which extends Thread...This class basically
reads some file which provides some start-time and stop-time information..
File structure is like:-
===========================================
<Entry1>Starttime = A and Stoptime = B
===========================================
Logic is that thread sleeps till time A arrived, then do some operations (which are written
in it's run() method) till stoptime..
The object of ABC class is being constructed in some other class.
Now there is a change....File can have multiple entries like..
======================================
<Entry1>starttime = A and stoptime = B
<Entry2>starttime = X and stoptime = Z
<Entry3>starttime = A and stoptime = B
<Entryn>starttime = X and stoptime = Z
======================================
The start-time and stop-time of any two Entries can be same or different.
The operations should start executing at the defined time..
In this case, multiple threads are required, which can do the operations
mentioned in Entry1,2 etc.....But how should it be implemented..
My query is:-
1) Can I have a common-wrapper class, which reads the file and based on
the number of Entries, instantiates that much number of threads...
But how to do that....I am new to JAVA...Should that class be a simple
class...or should it also implement Thread/Runnable interface.....
Or can I implement it as ThreadGroup......
Please give soem suggestions....Thanks...

Answer 1

e.g.
        ScheduledExecutorService exec = Executors.newScheduledThreadPool(2);
        exec.schedule(new Runnable() {
            public void run() {
                runTask();
        }, delay, TimeUnit.MILLISECONDS);