Several states of java threads

The status of the java thread: 1. New; 2. Ready; 3. Running; 4. Waiting; 5. Timing waiting; 6. Termination. Detailed introduction: 1. New, when a thread is created, it is in the new state. The thread object has been created, but it has not been started. In this state, the thread has not started to perform tasks; 2. Ready, when the thread has been When started and not waiting for resources or executing tasks, it is in the ready state and the thread is ready to run, but whether it is actually executed depends on the scheduling of the operating system; 3. Running, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Threads in Java can be in different states during their life cycle. According to the life cycle of threads and Java specifications, threads mainly have the following states:

1. New (New): When a thread is created, it is in the new state. At this point, the thread object has been created, but it has not been started. In this state, the thread has not yet started executing tasks.

2. Ready (Runnable): When a thread has been started and is not waiting for resources or executing tasks, it is in the ready state. At this point, the thread is ready to run, but whether it actually executes depends on the operating system's scheduling. In Java, a thread is started by calling the start() method of the thread object to make it enter the ready state.

3. Running: When a thread obtains CPU resources and performs tasks, it is in a running state. In this state, the thread is executing the code in its run() method. Only one thread can be in the running state, and other threads need to wait or compete for resources.

4. Waiting: When a thread is blocked by another thread, waiting for a certain condition to be established or to obtain the monitor lock of an object, it is in a waiting state. At this point, the thread is waiting for an event to occur before it can continue execution. In Java, a thread is put into a waiting state by calling the wait() method of the Thread class.

5. Timed Waiting: When a thread waits for another thread to perform a specific operation or waits for a specified time to continue execution, it is in a timed waiting state. In Java, the thread enters the scheduled waiting state by calling the sleep() method of the Thread class or using the tool class in the java.util.concurrent package.

6. Terminated: When a thread completes its execution task or terminates abnormally, it is in a terminated state. At this point, the thread is no longer running and cannot be started again. In Java, a thread is terminated by calling the interrupt() method of the Thread class or using an exception.

The above are the main states of Java threads, which describe the different stages of the thread in its life cycle. Understanding these states is important for understanding and controlling the behavior of multithreaded programs. In actual programming, it is necessary to select appropriate states and mechanisms according to specific needs and scenarios to achieve multi-threaded collaborative work.

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