eh?

gistfile1.txt

public class myE {

	static int counter = 0;

 
	public static void main(String[] args) throws InterruptedException {

		if (args.length < 1) {

			throw new IllegalArgumentException("Usage: Ex1q9 N");

		}

		Integer numberOfThreads = Integer.valueOf(args[0]);

 
		Thread[] threads = new Thread[numberOfThreads];

 
		long start = System.currentTimeMillis();

 
		for (int i = 0; i < numberOfThreads; i++) {

			threads[i] = new Thread(new Runnable() {

				//@Override
				public void run() {

					for (int j = 0; j < 10000; j++) {

						int localCounter = counter;

						localCounter += 1;

						counter = localCounter;

					}
				}

			});
			threads[i].start();

		}
 
		for (Thread thread : threads) {

			thread.join();

		}
 
		long duration = System.currentTimeMillis() - start;

		System.out.println(String.format("counter=%d duration=%d", counter, duration));

	}
}