import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class Resource {
  private String name;
  private Semaphore semaphore;
  private Lock lock;
  public Resource(String name) {
    this.name = name;
    this.semaphore = new Semaphore(1);
    this.lock = new ReentrantLock();
  }
  public void use() throws InterruptedException {
    semaphore.acquire();
    try {
      lock.lock();
      try {
        System.out.println(name + " is being used by thread " + Thread.currentThread().getName());
        Thread.sleep(1000);
      } finally {
        lock.unlock();
      }
    } finally {
      semaphore.release();
    }
  }
}
class UserThread extends Thread {
  private Resource resource;
  public UserThread(Resource resource) {
    this.resource = resource;
  }
  @Override
  public void run() {
    try {
      resource.use();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
}
public class Main {
  public static void main(String[] args) {
    Resource resource = new Resource("Khushi Patil");
    UserThread user1 = new UserThread(resource);
    UserThread user2 = new UserThread(resource);
    user1.setName("Thread 1");
    user2.setName("Thread 2");
    user1.start();
    user2.start();
  }
}