package threads;
import java.util.Random;

public class DataRace extends Thread {
	static int common = 0;
	
	public void run() {
		int local = common;
		if (new Random().nextInt(1001) > 500) {
			try {
				Thread.sleep(new Random().nextInt(2000));
			} catch(InterruptedException e) {}
		}
		local = local + 1;
		common = local; 
	}
	
	public static void main(String[] args) {
		int threadNumber = 3;
		Thread array[] = new Thread[threadNumber];
		
		for (int i = 0; i < 3; i++) 
			(array[i] = new DataRace()).start();
		
		try {
			for (int i=0; i < 3; i++) 
				array[i].join();
		} catch (InterruptedException e) {
			System.out.println(e.getMessage());
			e.printStackTrace();
		}
		
		System.out.println("Common Value: " + common); // may not be 3
	}
}