Multithread demo in Java.

MultithreadDemo.java

public class MultithreadDemo {
  public static void main(String[] args) {
    for (int i = 0; i < 10; i++) {
      Task task = new Task();
      task.start();
    }
  }
}

class Task extends Thread {
  public void run() {
    System.out.println("Thread: " + Thread.currentThread().getId() + " is running");
  }
}