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Showing content from https://www.tutorialspoint.com/java/lang/thread_getid.htm below:

Java Thread getId() Method

The Java Thread getId() method returns the identifier of this Thread. The thread ID is a positive long number generated when this thread was created.

The thread ID is unique and remains unchanged during its lifetime. When a thread is terminated, this thread ID may be reused.

Following is the declaration for java.lang.Thread.getId() method

public long getId()

NA

This method returns this thread's ID.

NA

The following example shows the usage of Java Thread getId() method. In this program, we've created a class ThreadDemo by implementing Runnable interface. In constructor, we've created a new thread with default name as Admin Thread and printed the same. Using start() method, thread is started. In run() method, using getId(), the id of the thread is printed. In main method, ThreadDemo object is created.

package com.tutorialspoint;

public class ThreadDemo implements Runnable {

   Thread t;
   ThreadDemo() {
    
      // thread created
      t = new Thread(this, "Admin Thread");
      
      // set thread priority
      t.setPriority(1);
      
      // print thread created
      System.out.println("thread  = " + t);
      
      // this will call run() function
      t.start();
   }

   public void run() {
      // returns the name of this Thread.
      System.out.println("Name = " + t.getName());
      // returns the id of this Thread.
      System.out.println("Id = " + t.getId());
   }

   public static void main(String args[]) {
      new ThreadDemo();
   }
} 

Let us compile and run the above program, this will produce the following result −

thread  = Thread[#21,Admin Thread,1,main]
Name = Admin Thread
Id = 21

The following example shows the usage of Java Thread getId() method. In this program, we've created a class ThreadDemo by extending Thread class. In constructor, we've created a new thread with default name as Admin Thread and printed the same. Using start() method, thread is started. In run() method, using getId(), the id of the thread is printed. In main method, ThreadDemo object is created.

package com.tutorialspoint;

public class ThreadDemo extends Thread {

   Thread t;
   ThreadDemo() {
    
      // thread created
      t = new Thread(this, "Admin Thread");
      
      // set thread priority
      t.setPriority(1);
      
      // print thread created
      System.out.println("thread  = " + t);
      
      // this will call run() function
      t.start();
   }

   public void run() {
      // returns the name of this Thread.
      System.out.println("Name = " + t.getName());
      // returns the id of this Thread.
      System.out.println("Id = " + t.getId());
   }

   public static void main(String args[]) {
      new ThreadDemo();
   }
} 

Let us compile and run the above program, this will produce the following result −

thread  = Thread[#22,Admin Thread,1,main]
Name = Admin Thread
Id = 22

java_lang_thread.htm

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