Word Tearing Example

package com.j256;

public class WordTearingExample {

    private static final int NUM_THREADS = 100;
    private static final int ITERS = 100000000;

    public static void main(String[] args) {
        Thread[] threads = new Thread[NUM_THREADS];
        byte[] counts = new byte[NUM_THREADS];
        for (int i = 0; i < NUM_THREADS; ++i) {
            threads[i] = new Thread(new Inner(counts, i));
            threads[i].start();
        }
    }

    private static class Inner implements Runnable {

        private final byte[] counts;
        private final int id;

        public Inner(byte[] counts, int id) {
            this.counts = counts;
            this.id = id;
        }

        public void run() {
            for (int i = 0; i < ITERS; i++) {
                if (counts[id] != (byte) i) {
                    System.err.println("Word-Tearing found: " + "counts[" + id + "] = " + counts[id] + ", should be "
                            + i);
                    return;
                }
                // NOTE: no synchronization
                counts[id] = (byte) (i + 1);
            }
        }
    }
}