Java AtomicLong 类

import java.util.concurrent.atomic.AtomicLong;

public class TestThread {

   static class Counter {
      private AtomicLong c = new AtomicLong(0);

      public void increment() {
         c.getAndIncrement();
      }

      public long value() {
         return c.get();
      }
   }

   public static void main(final String[] arguments) throws InterruptedException {
      final Counter counter = new Counter();

      //1000 threads
      for(int i = 0; i < 1000 ; i++) {

         new Thread(new Runnable() {

            public void run() {
               counter.increment();
            }
         }).start();
      }
      Thread.sleep(6000);                     
      System.out.println("Final number (should be 1000): " + counter.value());
   }
}