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public class MainActivity extends AppCompatActivity 
        implements ForceUpdateChecker.OnUpdateNeededListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ForceUpdateChecker.with(this).onUpdateNeeded(this).check();
    }

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public class ForceUpdateChecker {

    private static final String TAG = ForceUpdateChecker.class.getSimpleName();

    public static final String KEY_UPDATE_REQUIRED = "force_update_required";
    public static final String KEY_CURRENT_VERSION = "force_update_current_version";
    public static final String KEY_UPDATE_URL = "force_update_store_url";

    private OnUpdateNeededListener onUpdateNeededListener;
    private Context context;

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public class App extends Application {

    private static final String TAG = App.class.getSimpleName();

    @Override
    public void onCreate() {
        super.onCreate();

        final FirebaseRemoteConfig firebaseRemoteConfig = FirebaseRemoteConfig.getInstance();

sembozdemir

public class App extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        Timber.plant(BuildConfig.DEBUG
                ? new Timber.DebugTree()
                : new CrashReportingTree());

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try {
    // throw exception
    throwException();
} catch (Exception e) {
    Timber.e(e.getMessage);
}

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try {
    // throw exception
    throwException();
} catch (Exception e) {
    // Crashlytics
    Crashlytics.logException(e);

    // Firebase Crash Reporting
    FirebaseCrash.logcat(Log.ERROR, TAG, e.getMessage());
    FirebaseCrash.report(e);

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public class RandomGenerator {
    private OnNumberGeneratedListener listener;

    public RandomGenerator() {
    }

    public OnNumberGeneratedListener getListener() {
        return listener;
    }

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public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        RandomGenerator randomGenerator = new RandomGenerator();
        randomGenerator.setListener(new OnNumberGeneratedListener() {
            @Override
            public void onNumberGenerated(int number) {
                System.out.println(number);

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public interface OnNumberGeneratedListener {
    void onNumberGenerated(int number);
}

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public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        RandomGenerator randomGenerator = new RandomGenerator();
        while(true) {
            scanner.nextLine();
            int number = randomGenerator.getNumber();
            System.out.println(number);
        }