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parallel counting in Java using AtomicInteger

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.TimeUnit;

class ParallelCounterExample {
   public static void main(String[] args) throws InterruptedException {
      int threads = 2000;
      ExecutorService executor = Executors.newFixedThreadPool(threads);
      final AtomicInteger atomi = new AtomicInteger();
      for(int i=0; i<threads; i++) {
         executor.execute( new Runnable() {
            public void run() {
      executor.awaitTermination(1, TimeUnit.SECONDS);
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