generators.java

public class WithdrawGenerator extends Generator<Withdraw> {

    public WithdrawGenerator() {
        super(Withdraw.class);
    }

    @Override
    public Withdraw generate(SourceOfRandomness sourceOfRandomness, GenerationStatus generationStatus) {
        return new Withdraw(sourceOfRandomness.nextDouble(), new Date());
    }
}

public class AccountGenerator extends Generator<Account> {
    public AccountGenerator() {
        super(Account.class);
    }

    @Override
    public Account generate(SourceOfRandomness sourceOfRandomness, GenerationStatus generationStatus) {
        return new Account(sourceOfRandomness.nextDouble(),
                sourceOfRandomness.nextBoolean(),
                sourceOfRandomness.nextDouble());
    }
}