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Preset Examples:

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Source Snippet: 1233 chars

package demo;

// 1. Relazioni di interfaccia e contratti
interface PaymentMethod {
    boolean process(double amount);
}

// 2. Ereditarietà e classi astratte (IsA / Implements)
abstract class BaseAccount implements PaymentMethod {
    protected String accountId;
    
    public BaseAccount(String id) {
        this.accountId = id;
    }
}

// 3. Classe concreta con classe annidata (NestedIn)
class CreditCard extends BaseAccount {
    private SecurityToken token;

public CreditCard(String id, String rawSecret) {
        super(id);
        this.token = new SecurityToken(rawSecret);
    }

@Override
    public boolean process(double amount) {
        return token.validate();
    }

// Inner class statica
    static class SecurityToken {
        private String secret;
        public SecurityToken(String secret) { this.secret = secret; }
        public boolean validate() { return secret != null; }
    }
}

// 4. Servizio che usa e istanzia i componenti (Instantiates / Calls)
class CheckoutService {
    public void executeCheckout(PaymentMethod method, double total) {
        CreditCard fallback = new CreditCard("CC-99", "secret-key");
        method.process(total);
        fallback.process(total);
    }
}