package singleton;

public class AppConfigSynchronized {

    private static AppConfigSynchronized instance;

    private AppConfigSynchronized() { /* load config */ }

    // synchronized: only one thread can execute this method at a time
    public static synchronized AppConfigSynchronized getInstance() {
        if (instance == null) {
            instance = new AppConfigSynchronized(); // safe — no other thread can be here
        }
        return instance;
    }
}