SynchronousQueue 同步队列

SynchronousQueue 同步队列

• 没有容量，
  进去一个元素，必须等待取出来之后，才能再往里面放一个元素！
  put、take

• public class Test01 {
      /**
       * 同步队列
       * 和其他的BlockingQueue 不一样， SynchronousQueue 不存储元素
       * put了一个元素，必须从里面先take取出来，否则不能在put进去值！
       */
      public static void main(String[] args) throws InterruptedException {
          SynchronousQueue<String> synchronousQueue = new SynchronousQueue<>();
          new Thread(() -> {
              try {
                  System.out.println(Thread.currentThread().getName() + "put 1");
                  synchronousQueue.put("1");
                  System.out.println(Thread.currentThread().getName() + "put 2");
                  synchronousQueue.put("2");
                  System.out.println(Thread.currentThread().getName() + "put 3");
                  synchronousQueue.put("3");
              } catch (Exception e) {
                  e.printStackTrace();
              }
  
          }, "小明").start();
  
          new Thread(() -> {
              try {
                  TimeUnit.SECONDS.sleep(3);
                  System.out.println(Thread.currentThread().getName() + "take" + synchronousQueue.take());
                  TimeUnit.SECONDS.sleep(3);
                  System.out.println(Thread.currentThread().getName() + "take" + synchronousQueue.take());
                  TimeUnit.SECONDS.sleep(3);
                  System.out.println(Thread.currentThread().getName() + "take" + synchronousQueue.take());
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }, "小红").start();
      }
  }