AtomicInteger count = new AtomicInteger(0); public void incrementCount() { count.getAndIncrement(); } ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); public void addToMap(String key, Integer value) { map.put(key, value); } ExecutorService executor = Executors.newFixedThreadPool(10); public void executeTask(Runnable task) { executor.execute(task); }