data-class-move-method-before.java

public class BankAccount
{
    public BankAccount(int accountAge, int creditScore, AccountInterest accountInterest)
    {
        AccountAge = accountAge;
        CreditScore = creditScore;
        AccountInterest = accountInterest;
    }
    
    public int AccountAge { get; private set; }
    public int CreditScore { get; private set; }
    public AccountInterest AccountInterest { get; private set; }

    public double CalculateInterestRate()
    {
        if (CreditScore > 800)
            return 0.02;

        if (AccountAge > 10)
            return 0.03;

        return 0.05;
    }
}

public class AccountInterest
{
    public BankAccount Account { get; private set; }

    public AccountInterest(BankAccount account)
    {
        Account = account;
    }

    public double InterestRate
    {
        get { return Account.CalculateInterestRate(); }
    }

    public bool IntroductoryRate
    {
        get { return Account.CalculateInterestRate() < 0.05; }
    }
}