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

The Java code defines two classes: PrintThreadID and MyThread. The PrintThreadID class is the main class, and the MyThread class implements the Runnable interface to define the behavior of a custom thread.

In the PrintThreadID class, the main method creates a new thread t by passing an instance of MyThread to its constructor. The code then starts the thread's execution using the start() method.

The MyThread class defines the run() method, which is executed when the t thread starts running. Inside the run() method, the code retrieves the ID of the current thread using Thread.currentThread().getId() and then prints it to the console.

When you run this code, it will print the ID of the thread executing the run() method, which is the ID of the newly created t thread. The thread ID is a unique identifier assigned by the JVM to each thread. The ID is a positive long integer, and the value can vary based on the platform and the JVM implementation.

Source Code

public class PrintThreadID
{
	public static void main(String[] args)
	{
		Thread t = new Thread(new MyThread());
		t.start();
	}
}
class MyThread implements Runnable
{
	public void run()
	{
		System.out.println("Thread ID : " + Thread.currentThread().getId());
	}
}

Output

Thread ID : 21