Synchronization?

[David Crow]

I've got two classes, Day and Hour, running in separate threads. At certain points within each, they will create an instance of a third class, TZ, and call one of its methods, retrieve(). The retrieve() method is synchronized, like:

public synchronized void retrieve()
{
Thread thread = new Thread(new Runnable()
{
@Override
public void run()
{
// do some lengthy work
}
});

thread.start();

}

The work in retrieve() only needs to be done once, by whichever of Day or Hour gets to it first. How can I accomplish this? Thanks. DC

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