Thread Priority

    In Java, each thread can be assigned a priority, which affects the order in which it is scheduled for running.

      The priority of a thread can be set using the setPriority() method as:

Threadname.setPriority(intNumber);

   The intNumber is an integer value to which the thread’s priority is set. Thread class defines several priority constants:

MIN_PRIORITY=1

NORM_PRIORITY=5

MAX_PRIORITY=10

    The default priority of a thread is NORM_PRIORITY.

    If a higher priority thread arrives, then the currently running thread will be preempted by the incoming thread thus forcing the current thread to move to the Runnable state.

    Example:

class A extends Thread

{

public void run()

 {

for(int i=1;i<=3;i++)

System.out.println("Thread A is executing");

 }

}

class B extends Thread

{

public void run()

 {

for(int j=1;j<=3;j++)

System.out.println("Thread B is executing");

 }

}

class C extends Thread

{

public void run()

 {

for(int k=1;k<=3;k++)

System.out.println("Thread C is executing");

 }

}

classThreadpriority

{

public static void main(String args[])

 {

  A a= new A();

  B b=new B();

  C c=new C();

a.setPriority(Thread.MIN_PRIORITY);

a.start();

b.setPriority(a.getPriority()+1);

c.setPriority(Thread.MAX_PRIORITY);

b.start();

c.start();

 }

}

Output:

Thread C is executing

Thread C is executing

Thread C is executing

Thread B is executing

Thread A is executing

Thread B is executing

Thread B is executing

Thread A is executing

Thread A is executing