Java Threading Synchronization example

PingPong.java

public class PingPong {
	// state variable identifying whose turn it is.
	private String whoseTurn = null;

	public synchronized boolean hit(String opponent) {

		String x = Thread.currentThread().getName();

		if (x.compareTo(whoseTurn) == 0) {
			System.out.println("PING! (" + x + ")");
			whoseTurn = opponent;
			notifyAll();
		} else {
                       try { 	wait(2500); } 
                       catch (InterruptedException e) {	}
                }
       }
}