Thread.State

Thread.State is of type enum and represents the states of a thread.

Below Example shows the different states of a thread in Java

   

class ThreadState{
 public static void main(String args[]){
  for(Thread.State c : Thread.State.values())
   System.out.println(c);
   }
}

Output

NEW
RUNNABLE
BLOCKED
WAITING
TIMED_WAITING
TERMINATED

State	Description
NEW	It is the state where thread is created and not yet started
RUNNABLE	A thread in the runnable state is executing in the Java virtual machine but it may be waiting for other resources from the operating system such as processor.
BLOCKED	It is the state, where a thread is blocked to acquire a monitor lock
WAITING	A thread is in waiting state by calling wait() or join() methods with no time outs, I.e, with no parameters passing to them
TIMED_WAITING	A thread is in the timed waiting state due to calling one of the methods sleep, wait, join with a specified positive waiting time
TERMINATED	Thread completes execution or stopped.

Thread.state has two methods

1. public static Thread.State[] values()

Returns the array contains the all enum constants of this type.

2. public static Thread.State valueOf(String name)

Method returns the enum constant with the specified String.

Example

class ThreadState{
 public static void main(String args[]){
  Thread.State const1 = Thread.State.valueOf("NEW");
  Thread.State const2 = Thread.State.valueOf("RUNNABLE");
  Thread.State const3 = Thread.State.valueOf("TERMINATED");

  System.out.println("const1 is " + const1);
  System.out.println("const2 is " + const2);
  System.out.println("const3 is " + const3);
 }
}

Output

const1 is NEW
const2 is RUNNABLE
const3 is TERMINATED

   

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