import java.util.concurrent.atomic.AtomicInteger; public class NoLockSynchronization { private static AtomicInteger counter = new AtomicInteger(0); public void update() { while (true) { int actual = counter.get(); int newValue = actual + 1; while (!counter.compareAndSet(actual, newValue)); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } public void print() { while (true) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(counter.get()); } } public static void main(String[] args) throws InterruptedException { NoLockSynchronization nls = new NoLockSynchronization(); Thread t1 = new Thread(() -> { nls.update(); }); Thread t2 = new Thread(() -> { nls.update(); }); Thread t3 = new Thread(() -> { nls.print(); }); t1.start(); t2.start(); t3.start(); t1.join(); t2.join(); t3.join(); } }