Program/Source Code:

The source code to print the thread Id of a thread is given below. The given program is compiled and executed successfully.

// Java program to print the thread Id of a thread

class MyThread implements Runnable {
  public void run() {
    System.out.println("Thread Id: " + Thread.currentThread().getId());
  }
}

public class Main {
  public static void main(String[] args) {
    Thread t = new Thread(new MyThread());
    t.start();
  }
}

Output:

Thread Id: 10

Explanation:

In the above program, we created two classes MyThread and Main. To create MyThread class, we implemented the Runnable interface and override run() method. In the run() method, we get the id of thread using Thread.currentThread().getId() method.

The Main class contains a main() method. The main() method is the entry point for the program. Here, we created the object of the Thread class using the object of the MyThread class and started the thread and printed the thread id.