6.23

public class StoreController {
    private List<Store> stores = new ArrayList<>();
    @GetMapping("/{storeId}/products")
    public List<Product> getStoreProducts(@PathVariable Long storeId) {
        Store store = findStoreById(storeId);
        if (store != null) {
            return store.getProducts();
        }
        return new ArrayList<>();
    }
    @PostMapping
    public Store addStore(@RequestBody Store store) {
        store.setId(generateStoreId());
        stores.add(store);
        return store;
    }
    private Store findStoreById(Long storeId) {
        return stores.stream()
                .filter(store -> store.getId().equals(storeId))
                .findFirst()
                .orElse(null);
    }
    private Long generateStoreId() {
        return Long.valueOf(stores.size() + 1);
    }
}

SharedPreferences sharedPreferences = getSharedPreferences("user_data", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();

Gson gson = new Gson();
String couponsJson = gson.toJson(user.getCoupons());
editor.putString("user_coupons", couponsJson);
editor.apply();

public class TimeBasedActionManager {
    private Timer timer;
    private boolean isOpen = false;
    public void startTimedAction() {
        int openHour = 8;  // 8 AM
        int closeHour = 18; // 6 PM
        timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                Calendar calendar = Calendar.getInstance();
                int currentHour = calendar.get(Calendar.HOUR_OF_DAY);
                if (currentHour >= openHour && currentHour < closeHour) {
                    if (!isOpen) {
                        open();
                    }
                } else {
                    if (isOpen) {
                        close();
                    }
                }
            }
        }, 0, 60000);
    }

    private void open() {
        isOpen = true;
        System.out.println("Open at " + getCurrentTime());
    }
    private void close() {
        isOpen = false;
        System.out.println("Close at " + getCurrentTime());
    }
    private String getCurrentTime() {
        Calendar calendar = Calendar.getInstance();
        int currentHour = calendar.get(Calendar.HOUR_OF_DAY);
        int currentMinute = calendar.get(Calendar.MINUTE);
        return String.format("%02d:%02d", currentHour, currentMinute);
    }
    public static void main(String[] args) {
        TimeBasedActionManager actionManager = new TimeBasedActionManager();
        actionManager.startTimedAction();
    }
}