Java Thread wait() => blocked?

Question

According to Java thread state info calling wait() will result a thread to go in BLOCKED state. However this piece of code will result (after being called) in a Thread in WA

Answer 1

Just as a reminder, you should always call wait() inside a while loop waiting on the condition for entering the synchronized region/critical section. This is because Java has "spurious wakeups" (essentially, a thread can wakeup at any moment for no reason).