// This example is from the book _Java Threads_ by Scott Oaks and Henry Wong. 
// Written by Scott Oaks and Henry Wong.
// Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or implied.

// Sample TargetNotify -- Chapter 4, p. 81.

public class TargetNotify {
    private Object Targets[] = null;

    public TargetNotify (int numberOfTargets) {
        Targets = new Object[numberOfTargets];

        for (int i = 0; i < numberOfTargets; i++) {
            Targets[i] = new Object();
        }
    }

    public void wait (int targetNumber) {
        synchronized (Targets[targetNumber]) {
            try {
                Targets[targetNumber].wait();
            } catch (Exception e) {}
        }
    }

    public void notify (int targetNumber) {
        synchronized (Targets[targetNumber]) {
            Targets[targetNumber].notify();
        }
    }
}