Several states of Java threads

One. Thread state type
1. New state: A new Thread object was created.
2. Ready state (Runnable): After the thread object is created, other threads call the object's start () method. The state of the thread is located in a pool of running threads that becomes operational and waits for the CPU to be used.
3. Running state (Running): The ready state of the thread gets the CPU and executes the program code.
4. Blocking state (Blocked): The blocking state is a temporary stop for a thread that has abandoned the CPU usage for some reason. Until the thread is in a ready state, the opportunity to go to the running state is reached. There are three types of blocking:
(i), waiting for blocking: The running thread executes the wait () method, and the JVM puts the thread into the waiting pool.
(ii), synchronous blocking: When a running thread acquires a synchronization lock on an object, the JVM puts the thread into the lock pool if the synchronization lock is occupied by another thread.
(iii), other blocking: The running thread executes the sleep () or join () method, or when an I/O request is made, the JVM will place the thread in a blocked state. When the sleep () state times out, join () waits for the thread to terminate or time out, or the I/O process finishes, the thread is re-entered in a ready state.
5. Death status (Dead): The thread finishes executing or exits the run () method because of an exception, and the thread ends the life cycle.
Two. Thread state diagram

Several states of Java threads