ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
set.add("apple");
set.add("banana");
set.add("orange");
NonBlockingHashMapLongToObject<String> map = new NonBlockingHashMapLongToObject<>();
map.put(1L, "apple");
map.put(2L, "banana");
map.put(3L, "orange");
int[] arr = {5, 2, 9, 1, 7};
QuickSort.sort(arr);
for (int num : arr) {
}
AtomicCounter counter = new AtomicCounter();
counter.increment();
counter.increment();
counter.decrement();
