Play with concurrency: draw a thread state transition diagram

Thread state transition

The simple thread state is shown below

Java Thread There is an enumeration inner class inside the thread State, Defined Java The state of the thread language

1. NEW（ Initialization status ）
2. RUNNABLE （ Can run / Running state ）
3. BLOCKED（ Blocked state ）
4. WAITING （ Wait indefinitely ）
5. TIMED_WAITING（ Sometimes it's time to wait ）
6. TERMINATED（ Termination status ）

Java The blocking state at the operating system level is subdivided into BLOCK,WAITING,TIMED_WAITING Three states

NEW： New state , The state in which a thread is created but not started . There are three ways to create threads

1. Inherit Thread class
2. Realization Runnable Interface
3. Realization Callable Interface

The most common way we use it is by implementing interfaces ,Runnable and Callable The differences between interfaces are as follows

1. Runnable Unable to get return value , and Callable Can get the return value
2. Runnable Can't throw exception , and Callable You can throw an exception

RUNNABLE（ Ready state ）： call start After running the state before
RUNNING（ Running state ）： The thread is running
BLOCKED（ Blocked state ）： Enter the following state , There are several situations

1. BLOCK（ Synchronous blocking ）： The lock is occupied by another thread , Waiting to enter synchronized Method or code block
2. WAITING（ Active blocking ）： perform Object.wait(),Thread.join() etc.
3. TIMED_WAITING（ Waiting for a jam ）： perform Object.wait(long),Thread.sleep(long) etc.

DEAD（ Termination status ）： Thread execution completed
Finally, various methods are added to the thread state diagram

The functions of various methods in the figure will be analyzed in detail in subsequent chapters

Reference blog

[1]https://blog.csdn.net/pange1991/article/details/53860651