Java.lang.Thread.getId() Method

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Description

The java.lang.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.

Declaration

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

public long getId()

Parameters

  • NA

Return Value

This method returns this thread's ID.

Exception

  • NA

Example

The following example shows the usage of java.lang.Thread.getId() method.

package com.tutorialspoint;

import java.lang.*;

public class ThreadDemo implements Runnable {

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

   public void run() {
      // returns the identifier of this Thread.
      System.out.println("Name = " + t.getName());
      System.out.print("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[Admin Thread,1,main]
Name = Admin Thread
Id = 8



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