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Java Java Objects Delivering the MVP Applying a Discount Code

michael lee
michael lee
5,179 Points

What am I doing Wrong?

cannot understand what I am missing, please help I'm stuck in the first Challenge

Order.java
public class Order {
  private String itemName;
  private int priceInCents;
  private String discountCode;

  public Order(String itemName, int priceInCents) {
    this.itemName = itemName;
    this.priceInCents = priceInCents;
  }

  public String normalizeDiscountCode(String discountCode){
  this.discountCode = discountCode;
    discountCode = discountCode.toUpperCase();
    return discountCode;
  }

  public String getItemName() {
    return itemName;
  }

  public int getPriceInCents() {
    return priceInCents;
  }

  public String getDiscountCode() {
    return discountCode;
  }

  public void applyDiscountCode(String discountCode) {
    this.discountCode = discountCode;
    discountCode = discountCode.normalizeDiscountCode(discountCode);
  }
}
Example.java
public class Example {

  public static void main(String[] args) {
    // This is here just for example use cases.

    Order order = new Order(
            "Yoda PEZ Dispenser",
            600);

    // These are valid.  They are letters and the $ character only
    order.applyDiscountCode("abc");
    order.getDiscountCode(); // ABC

    order.applyDiscountCode("$ale");
    order.getDiscountCode(); // $ALE


    try {
      // This will throw an exception because it contains numbers
      order.applyDiscountCode("ABC123");
    } catch (IllegalArgumentException iae) {
      System.out.println(iae.getMessage());  // Prints "Invalid discount code"
    }
    try {
      // This will throw as well, because it contains a symbol.
      order.applyDiscountCode("w@w");
    }catch (IllegalArgumentException iae) {
      System.out.println(iae.getMessage());  // Prints "Invalid discount code"
    }

  }
}

2 Answers

Hi, what exactly was the problem?, here is the working code for the first task:

public class Order {
  private String itemName;
  private int priceInCents;
  private String discountCode;

  public Order(String itemName, int priceInCents) {
    this.itemName = itemName;
    this.priceInCents = priceInCents;
  }

  public String getItemName() {
    return itemName;
  }

  public int getPriceInCents() {
    return priceInCents
  }

  public String getDiscountCode() {
    return discountCode;
  }

  public void applyDiscountCode(String discountCode) {
    this.discountCode = normalizeDiscountCode(discountCode);

  }

  private String normalizeDiscountCode(String discountCode){
    return discountCode.toUpperCase();
}
}

First u create the method that will a String and pass the discountCode as a parameter and inside the method u just return to upper case version of it. then u just need assign NormalizeDiscount code and the thing u want to normalize which is the discount code to the this.discountcode, doing this that way ensures that every discountCode we apply will be uppercased. hope this helps

Hey, I just got one question.

this.discountCode = normalizeDiscountCode(discountCode);

Why do we put discountCode into the parentheses?

u put discount code in () because normalizeDiscoungCode takes a String which is the discount code an in order to apply a legitimate discount code u need to normalize the discount code first(normalize method takes the string and return a uppercase version of it)

Thanks for the help. :)