The dangling inputs in the join prevent it from executing and thus block all activities succeeding it.
join中的悬空输入，会使join无法执行，并因此阻塞后面的所有活动。
In case of an exception, the catch block simply called the exception publisher, then returned the executing thread back to the thread pool.
如果发生了异常，这个catch块只是简单地调用异常发布程序，然后将正在执行的线程返回到线程池中。
As an example, consider any repetitive coding pattern, such as executing a block of code with a lock held.
以一个常见的编码模式为例，如执行带有Lock的代码块。
Thread 1 enters the if block, but is preempted by thread 2 before executing the line at //2.
线程1进入if代码块，但在执行 //2 处的代码行时被线程 2 预占。
When one thread is executing a synchronized block, any thread waiting to enter that block is stalled.
当一个线程正在执行一个同步块时，任何等待进入该块的线程都将被阻塞。
When one thread is executing a synchronized block, any thread waiting to enter that block is stalled.
当一个线程正在执行一个同步块时，任何等待进入该块的线程都将被阻塞。
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