Java Thread setPriority() method

The setPriority() method of thread class is used to change the thread’s priority. Every thread has a priority which is represented by the integer number between 1 to 10.

Thread class provides 3 constant properties:

public static int MIN_PRIORITY: It is the maximum priority of a thread. The value of it is 1.
public static int NORM_PRIORITY: It is the normal priority of a thread. The value of it is 5.
public static int MAX_PRIORITY: It is the minimum priority of a thread. The value of it is 10.

We can also set the priority of thread between 1 to 10. This priority is known as custom priority or user defined priority.

Syntax

Parameter

a: It is the priority to set this thread to.

Return

It does not return any value.

Exception

IllegalArgumentException: This exception throws if the priority is not in the range MIN_PRIORITY to MAX_PRIORITY.

SecurityException: This exception throws if the current thread cannot modify this thread.

Example 1: Maximum Priority Thread

  public class JavaSetPriorityExp1 extends Thread  {        public void run()      {            System.out.println(“Priority of thread is: “+Thread.currentThread().getPriority());        }        public static void main(String args[])      {            // creating one thread           JavaSetPriorityExp1 t1=new JavaSetPriorityExp1();            // print the maximum priority of this thread          t1.setPriority(Thread.MAX_PRIORITY);            // call the run() method          t1.start();        }    }  

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Output:

Priority of thread is: 10

Example 2: Minimum Priority Thread

  public class JavaSetPriorityExp2 extends Thread  {        public void run()      {            System.out.println(“Priority of thread is: “+Thread.currentThread().getPriority());        }        public static void main(String args[])      {            // creating one thread           JavaSetPriorityExp2 t1=new JavaSetPriorityExp2();            // print the minimum priority of this thread          t1.setPriority(Thread.MIN_PRIORITY);            // This will call the run() method          t1.start();        }    }  

Test it Now

Output:

Priority of thread is: 1

Example 3: Normal Priority Thread

  public class JavaSetPriorityExp3 extends Thread  {        public void run()      {            System.out.println(“Priority of thread is: “+Thread.currentThread().getPriority());        }        public static void main(String args[])      {            // creating one thread           JavaSetPriorityExp3 t1=new JavaSetPriorityExp3();            // print the normal priority of this thread          t1.setPriority(Thread.NORM_PRIORITY);            // starting the thread           t1.start();        }    }  

Test it Now

Output:

Priority of thread is: 5

Example 4: User define Priority Thread

  public class JavaSetPriorityExp4 extends Thread  {        public void run()      {            System.out.println(“running…”);        }        public static void main(String args[])      {            // creating one thread           JavaSetPriorityExp4 t1=new JavaSetPriorityExp4();            JavaSetPriorityExp4 t2=new JavaSetPriorityExp4();          // set the priority          t1.setPriority(4);          t2.setPriority(7);          // print the user defined priority           System.out.println(“Priority of thread t1 is: ” + t1.getPriority()); //4          System.out.println(“Priority of thread t2 is: ” + t2.getPriority()); //7          // this will call the run() method          t1.start();      }  }  

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Output:

Priority of thread t1 is: 4  Priority of thread t2 is: 7  running...

Example 5: When priority is greater than 10

  public class JavaSetPriorityExp5 extends Thread  {        public void run()      {            System.out.println(“running…”);        }        public static void main(String args[])      {            // creating one thread           JavaSetPriorityExp5 t1=new JavaSetPriorityExp5();            JavaSetPriorityExp5 t2=new JavaSetPriorityExp5();          // set the priority          t1.setPriority(12);          t2.setPriority(7);          // print exception because priority of t1 is greater than 10          System.out.println(“Priority of thread t1 is: ” + t1.getPriority());           System.out.println(“Priority of thread t2 is: ” + t2.getPriority());           // call the run() method          t1.start();      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.IllegalArgumentException  at java.lang.Thread.setPriority(Thread.java:1089)  at JavaSetPriorityExp5.main(JavaSetPriorityExp5.java:13)

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Java Thread setPriority() Method with Examples

Java Thread setPriority() method

Syntax

Parameter

Return

Exception

Example 1: Maximum Priority Thread

Example 2: Minimum Priority Thread

Example 3: Normal Priority Thread

Example 4: User define Priority Thread

Example 5: When priority is greater than 10

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