Strange Coder

Java provides atomic classes such as AtomicInteger, AtomicLong, AtomicBoolean and AtomicReference. Objects of these classes represent the atomic variable of int, long, boolean, and object reference respectively which can be atomically updated.

class Counter extends Thread {

    // Atomic counter Variable
    AtomicInteger count;

    // Constructor of class
    Counter()
    {
        count = new AtomicInteger();
    }

    // method which would be called upon
    // the start of execution of a thread
    public void run()
    {

        int max = 1_000_00_000;

        // incrementing counter total of max times
        for (int i = 0; i < max; i++) {
            count.addAndGet(1);
        }
    }
}

public class AtomicCounter {
    public static void main(String[] args)
            throws InterruptedException
    {
        // Instance of Counter Class
        Counter c = new Counter();

        // Defining Two different threads
        Thread first = new Thread(c, "First");
        Thread second = new Thread(c, "Second");

        // Threads start executing
        first.start();
        second.start();

        // main thread will wait for both
        // threads to complete execution
        first.join();
        second.join();

        // Printing final value of count variable
        System.out.println(c.count);
    }