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import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.stream.IntStream;public class Synchronized2 { private static final int NUM_INCREMENTS = 10000; private static int count = 0; public static void main(String[] args) { testSyncIncrement(); } private static void testSyncIncrement() { count = 0; ExecutorService executor = Executors.newFixedThreadPool(2); IntStream.range(0, NUM_INCREMENTS) .forEach(i -> executor.submit(Synchronized2::incrementSync)); ConcurrentUtils.stop(executor); System.out.println(count); } private static void incrementSync() { synchronized (Synchronized2.class) { count = count + 1; } }} 转载地址：http://jgigx.baihongyu.com/