SynchronousQueue阻塞的地方是在put进去一个元素即阻塞，没办法继续执行，除非其他线程take该队列的元素。
而ArrayBlockingQueue设置容量为1阻塞的地方是在下一次put，也就是说，put一个元素之后还能继续往下执行代码。

public class Queue {

    public static void main(String[] args) throws InterruptedException {
        testSynchronousQueue();
        TimeUnit.SECONDS.sleep(10);
        System.out.println("=================");
        testBlockingQueue();
    }

    private static void testSynchronousQueue(){
        BlockingQueue<String> blockingDeque = new SynchronousQueue<>();
        new Thread(()->{
            try {
                System.out.println(Thread.currentThread().getName() + "put 1");
                blockingDeque.put("1");
                System.out.println(Thread.currentThread().getName() + "put 2");
                blockingDeque.put("2");
                System.out.println(Thread.currentThread().getName() + "put 3");
                blockingDeque.put("3");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();

        new Thread(()->{
            try {
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 1");
                blockingDeque.take();
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 2");
                blockingDeque.take();
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 3");
                blockingDeque.take();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
    }

    private static void testBlockingQueue(){
        BlockingQueue<String> blockingDeque = new ArrayBlockingQueue<>(1);
        new Thread(()->{
            try {
                System.out.println(Thread.currentThread().getName() + "put 1");
                blockingDeque.put("1");
                System.out.println(Thread.currentThread().getName() + "put 2");
                blockingDeque.put("2");
                System.out.println(Thread.currentThread().getName() + "put 3");
                blockingDeque.put("3");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();

        new Thread(()->{
            try {
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 1");
                blockingDeque.take();
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 2");
                blockingDeque.take();
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName() + "take 3");
                blockingDeque.take();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
    }
}