MultiThreadedApp.java

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class SharedResource {
    private int count = 0;
    private final Lock lock = new ReentrantLock();

    public void increment() {
        lock.lock();
        try {
            count++;
            System.out.println(Thread.currentThread().getName() + " incremented count to: " + count);
        } finally {
            lock.unlock();
        }
    }

    public void decrement() {
        lock.lock();
        try {
            count--;
            System.out.println(Thread.currentThread().getName() + " decremented count to: " + count);
        } finally {
            lock.unlock();
        }
    }

    public int getCount() {
        return count;
    }
}

class IncrementThread extends Thread {
    private final SharedResource resource;

    public IncrementThread(SharedResource resource) {
        this.resource = resource;
    }

    public void run() {
        for (int i = 0; i < 5; i++) {
            resource.increment();
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

class DecrementThread extends Thread {
    private final SharedResource resource;

    public DecrementThread(SharedResource resource) {
        this.resource = resource;
    }

    public void run() {
        for (int i = 0; i < 5; i++) {
            resource.decrement();
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

public class MultiThreadedApp {
    public static void main(String[] args) {
        SharedResource resource = new SharedResource();
        Thread t1 = new IncrementThread(resource);
        Thread t2 = new DecrementThread(resource);
        
        t1.start();
        t2.start();
        
        try {
            t1.join();
            t2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
        System.out.println("Final count: " + resource.getCount());
    }
}