Bigdecimal error cannot find Symbol

Question

Given an amount in R$ convert it into dollar.

Well, based on this context, the teacher requested that we use the object orientation paradigm. Before I should clarify that I use to order ide Bluej to solve the problem, according to my teacher he is better for didactic purposes, I created a class Cambio and a class Main, that is leased the methods that receives the amount, the exchange rate and the conversion, this initializes system so to speak contained the method main.

exchange class:

public class Cambio
{
    private float amount;
    private double conversion;
    private float exchange;

    /**
     * Construtor
     */
    public Cambio(float amount, float exchange)
    {
        setAmount(amount);
        setExchange(exchange);
        conversion = 0;
    }

    /**
     * Método modificador: quantia.
     */
    public void setAmount(float amount)
    {
        this.amount = amount;
    }

    /**
     * Método modificador: taxa.
     */
    public void setExchange(float exchange)
    {
        this.exchange = exchange;
    }

    /**
     * Metodo acessador: quantia
     */
    public float getAmount()
    {
        return this.amount;
    }

    /**
     * Metodo acessador: taxa
     */
    public float getExchange()
    {
        return this.exchange;
    }

    /**
     * Metodo modificador: calcula o cambio.
     */
    public double getConversion()
    {
        BigDecimal bd = new BigDecimal(d).setScale(2, RoundingMode.HALF_EVEN);

        conversion = (float)this.amount / (float)this.exchange;

        return df.doubleValue(conversion);
    }
}

Main class:

public class Main
{
    public static void main(String[] args)
    {
        Scanner read = new Scanner(System.in);

        System.out.print("Digite a quantia: ");
        float amount = read.nextFloat();

        System.out.print("Digite a taxa cambial: ");
        float exchange = read.nextFloat();

        Cambio cb = new Cambio(amount, exchange);

        System.out.println("A valor em dolar: USS$" + cb.getConversion());
    }
}

I am using the class to format the values BigDecimal. Make a mistake and don’t compile:

cannot find Symbol (Bigdecimal class)

On the line:

BigDecimal bd = new BigDecimal(d).setScale(2, RoundingMode.HALF_EVEN);

As far as I understand reading the Bluej documentation I’m calling an object that doesn’t exist. I’ve used the BigDecimal to format values in double in another exercise.

Answer 1

This code uses a variable called d on the line

BigDecimal bd = new BigDecimal(d).setScale(2, RoundingMode.HALF_EVEN);

this variable is not declared anywhere in the code. Surely this causes the problem. You have to see what you want to use there. Whether the method should receive a parameter or pick up a class member.

On the line

df.doubleValue(conversion);

has another undeclared variable in use. Maybe in this case it was to be bd in place of df.

I put in the Github for future reference.

Work with float and double for monetary value does not work. But this is another problem.

Playing random codes doesn’t work either. The code needs to make some sense, it needs to have a minimum of coherence with what exists.