Thread states in Java

Thread state

A thread can exist in a number of different states. The various states of a thread are shown in the picture below:

All the states of the thread are briefly discussed below:

i. Blocked:

A thread is said to be blocked that has suspended execution because it is waiting to acquire a lock.

ii. New:

A thread that hasn’t begun execution.

iii. Runnable:

A thread that either is currently executing or will execute when it gains access to CPU.

iv. Terminated:

A thread that has completed execution.

v. Timed-waiting:

A thread that has suspended execution for a specified period of time such as it has called sleep. This state is also entered when a timed version of wait or join is called.

vi. Waiting:

A thread that has suspended execution because it is waiting for some action to occur. For example, it is waiting because of a call to a non-timed out version of wait or join.

We can obtain the current state of the thread by calling the getstate() method defined by thread.

Thread.State getstate()

It returns a value of type thread state that indicate the state of the thread at the time at which the call is made.