Write a Java program to create multiple threads

The Java code defines two classes: MultipleThread and MyThread. The MultipleThread class is the main class, and the MyThread class implements the Runnable interface to define the behavior of the threads.

In the MultipleThread class, the main method creates three threads t1, t2, and t3, each associated with an instance of the MyThread class. Then, it starts the execution of all three threads using the start() method.

The MyThread class defines the run() method, which is executed when the threads start running. Inside the run() method, a loop runs five times, and in each iteration, it prints a message indicating that the thread with the specified ID is running.

Since multiple threads are running concurrently, the order of execution and the interleaving of their outputs are not guaranteed. The thread IDs are unique identifiers assigned by the JVM to each thread. The output will show different thread IDs for each thread, and the messages may appear in different orders for each run.

Source Code

public class MultipleThread
{
	public static void main(String[] args)
	{
		Thread t1 = new Thread(new MyThread());
		Thread t2 = new Thread(new MyThread());
		Thread t3 = new Thread(new MyThread());
 
		t1.start();
		t2.start();
		t3.start();
	}
}
class MyThread implements Runnable
{
	public void run()
	{
		int i = 0;
 
		for (i = 1; i <= 5; i++)
		{
			System.out.println("Thread " + Thread.currentThread().getId() + " is running");
		}
	}
}

Output

Thread 22 is running
Thread 21 is running
Thread 22 is running
Thread 23 is running
Thread 21 is running
Thread 22 is running
Thread 23 is running
Thread 21 is running
Thread 22 is running
Thread 23 is running
Thread 21 is running
Thread 22 is running
Thread 23 is running
Thread 21 is running
Thread 23 is running