Java8-Atomic

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import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.atomic.AtomicInteger;import java.util.stream.IntStream;public class Atomic1 {    private static final int NUM_INCREMENTS = 1000;    private static AtomicInteger atomicInt = new AtomicInteger(0);    public static void main(String[] args) {        testIncrement();        testAccumulate();        testUpdate();    }    private static void testUpdate() {        atomicInt.set(0);        ExecutorService executor = Executors.newFixedThreadPool(2);        IntStream.range(0, NUM_INCREMENTS)                .forEach(i -> {                    Runnable task = () ->                            atomicInt.updateAndGet(n -> n + 2);                    executor.submit(task);                });        ConcurrentUtils.stop(executor);        System.out.format("Update: %d\n", atomicInt.get());    }    private static void testAccumulate() {        atomicInt.set(0);        ExecutorService executor = Executors.newFixedThreadPool(2);        IntStream.range(0, NUM_INCREMENTS)                .forEach(i -> {                    Runnable task = () ->                            atomicInt.accumulateAndGet(i, (n, m) -> n + m);                    executor.submit(task);                });        ConcurrentUtils.stop(executor);        System.out.format("Accumulate: %d\n", atomicInt.get());    }    private static void testIncrement() {        atomicInt.set(0);        ExecutorService executor = Executors.newFixedThreadPool(2);        IntStream.range(0, NUM_INCREMENTS)                .forEach(i -> executor.submit(atomicInt::incrementAndGet));        ConcurrentUtils.stop(executor);        System.out.format("Increment: Expected=%d; Is=%d\n", NUM_INCREMENTS, atomicInt.get());    }}
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