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efraibo axellbrendow raphitz xxhachimanxx linojulio beneditocarvalho lucasalvesdacosta maxflpcoelho2021 lucasbonadio israeljunior97 rodrigo-92-srb stbranca rodpro-br jeanmaki2002 choco02 elianecoelho gustavobastos1998 rochalarissa hainnersm guimarcos titanpolo evandroserikawa fabricioclecio clovis897 taisandrade raqueljcosta rafaelor20 daviascarv monteironeto cinthiatech arthurcristian luiztava gbrbm davy-404 viiparente dayvidsonveiga tml45 alexandrelalaina caverin kelvya luismendes070 katymilla mayconlimaaguiar bittenks cleaps-tech mmmeireles15 jeanherrman debsalbino matheusdelnero carlasampaios17 edsonbmj tthaissiqueira niedson-solino jhonatanmeireles savionasc lucenaleandro gitkezia anaelisabraz katiak2022 jessikaraw thiagordi nivadinho bergingit osnyneto nayaramenezes lucas-teodoro rooseveltlemos lucassmiranda mylla200 jobdev-hub cleysoncassio jorgevieirareis1 edumarcal marqueserick andersonmeurer tiagowilsonrft jncard evandroorlandini alefaggravo tauraedu rayannecristinar lytuanne edi-2 netopaiva henriquebena nickunger99 jardeljbastos paulowear rafaellafn leonardozaramello moisescs llucasgerald otaviogrocha bruna-quinto-marsiaj gabriel-fc arthurtb8 srtazuzza helengmarques joabdeferreira stephenroque

private Singleton() {
    // Construtor privado para impedir a criação de instâncias diretas.
}

public static Singleton getInstance() {
    if (instance == null) {
        instance = new Singleton();
    }
    return instance;
}

public CreditCardPayment(String cardNumber) {
    this.cardNumber = cardNumber;
}

@Override
public void pay(int amount) {
    System.out.println("Pagamento de $" + amount + " com cartão de crédito " + cardNumber);
}

public PayPalPayment(String email) {
    this.email = email;
}

@Override
public void pay(int amount) {
    // Lógica para pagamento com PayPal
    System.out.println("Pagamento de $" + amount + " com PayPal usando o email " + email);
}