Java线程类测试

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对java中的线程安全类及不安全的类进行测试~

  • 线程不安全类
    • StringBuilder -> StringBuffer
    • SimpleDateFormat -> JodaTime
  • 同步容器
    • ArrayList -> Vector,Stack
    • HashMap -> HashTable(key, value不能为null)
    • Collections.synchronizedXXX(List, Set, Map)
  • 并发容器
    • ArrayList -> CopyOnWriteArrayList
    • HashSet,TreeSet -> CopyOnWriteArraySet,ConcurrentSkipListSet
    • HashMap,TreeMap -> ConcurrentHashMap,ConcurrentSkipListMap
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//可以自行进行测试
public class ConcurrencyTest {
	
	//请求总数
	public static int clientTotal = 5000;
	//同时并发执行的线程数
	public static int threadTotal = 200;
	public static int count = 0;
    
	public static void main(String[] args) throws Exception {
		ExecutorService executorService = Executors.newCachedThreadPool();
		final Semaphore semaphore = new Semaphore(threadTotal);
		final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
		for (int i = 0; i < clientTotal; i++) {
			executorService.execute(() -> {
				try{
					semaphore.acquire();
					add();
					semaphore.release();
				} catch (Exception e){
					log.error("exception" , e);
				}
				countDownLatch.countDown();
			});
		}
		countDownLatch.await();
		executorService.shutdown();
		log.info("count:{}" , count);
		
	}
	
	private static void add(){
		count++;
	}
}