import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.CountDownLatch;
import java.util.Random;

public class FinnHoyeste {
	private static final int ANT_TRAADER = 200;

	public static void main(String[] args) {
		
		CountDownLatch ferdig = new CountDownLatch(ANT_TRAADER);
		Tallmonitor monitor = new Tallmonitor();

		for (int i = 0; i < ANT_TRAADER; i ++){
			new Thread(new Tallgenerator(ferdig, monitor)).start();
		}

		// Barriere
		try {
			ferdig.await();
		} catch (InterruptedException ie) {}


		int hoyest = monitor.hentHoyeste();
		System.out.println("Det h?yeste tallet var: " + hoyest + ".");
	}
}

class Tallgenerator implements Runnable {
	private static int IDgenerator = 0;
	private int minID;
	private CountDownLatch ferdigSignal;
	private Tallmonitor minMonitor;
	
	private Random random = new Random();

	public Tallgenerator(CountDownLatch ferdig, Tallmonitor minMonitor) {
		minID = ++ IDgenerator;
		ferdigSignal = ferdig;
		this.minMonitor = minMonitor;
	}

	public void run() {
		// Tr?dens kode

		int generertTall = random.nextInt(250) * random.nextInt(250);


		minMonitor.settInnTall(generertTall);
		ferdigSignal.countDown();


	}
}

class Tallmonitor {

	private int hoyesteHittil = 0;
	private Lock lock = new ReentrantLock();


	public int hentHoyeste() {
		return hoyesteHittil;
	}

	public void settInnTall(int tall) {
		lock.lock();
		try {

			//System.out.println("Tallet er: " + tall);
			
			if (tall > hoyesteHittil) {
				hoyesteHittil = tall;
			}
			

		} finally {
			lock.unlock();
		}
	}
}