我不知道你在哪里读到的执行IO时，线程处于BLOCKED状态。 BLOCKED州文档说：

I don't know where you read that a thread is in the BLOCKED state when doing IO. The BLOCKED state documentation says:

线程状态被阻塞等待监视器锁定。处于阻塞状态的线程正在等待监视器锁定以在调用Object.wait之后输入同步块/方法或重新输入同步块/方法。

Thread state for a thread blocked waiting for a monitor lock. A thread in the blocked state is waiting for a monitor lock to enter a synchronized block/method or reenter a synchronized block/method after calling Object.wait.

所以，不，一个线程在执行IO时不处于阻塞状态（除非当然读取或写入强制它等待对象的监视器。）

So, no, a thread is not in a blocked state while doing IO (unless of course reading or writing forces it to wait on an object's monitor).