Different states of thread in Java
Upasana | November 21, 2020 | 2 min read | 33 views
A thread in JVM can have 6 different states as defined in Thread.State enum. At any given time, thread must be in any of these states.
- NEW
-
This state is for a thread which has not yet started.
- RUNNABLE
-
This state is for the currently running thread which is executing in java virtual machine, but it may be waiting for the other resources from operating system such as processor.
- BLOCKED
-
Thread state for a thread blocked waiting for a monitor lock. A thread in this state can be waiting for a monitor lock to enter a synchronized block/method or reenter a synchronized method after calling
Object.wait(). - WAITING
-
A thread is waiting due to calling on one of the method -
-
Object.wait with no timeout
-
Thread.join with no timeout
-
LockSupport.park
-
A Thread in this state is waiting for another thread to perform a particular action. For example, a thread that has called Object.wait() on an object is waiting for another thread to call Object.notify() or Object.notifyAll() on that object. A thread that has called Thread.join() is waiting for a specified thread to terminate.
- TIMED_WAITING
-
Thread state for a waiting thread with a specified waiting time. A thread is in the timed waiting state due to calling one of the following methods with a specified positive waiting time -
-
Thread.sleep
-
Object.wait with timeout
-
Thread.join with timeout
-
LockSupport.parkNanos
-
LockSupport.parkUntil
-
- TERMINATED
-
Thread state for a terminated thread. The thread has completed execution.
References
This content has been taken directly from the Java Docs - Thread.State enum.
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