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Java Java Objects Delivering the MVP Applying a Discount Code

Schwartz Prince
PLUS
Schwartz Prince
Courses Plus Student 2,132 Points

Help me to find out the Error

This code shows me bummer when I check my work done. Please help me to find out where I went wrong. Thanks in advance.

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 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){
    String regex = "[a-zA-Z]+$";
    if (discountCode.matches(regex))
    {
    String result;
    result = discountCode.toUpperCase();
    return result;
  }else 
    {
      throw new IllegalArgumentException("Invalid discount code");
    }
  }
}
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"
    }

  }
}

1 Answer

The problem is your regex: "[a-zA-Z]+$", it should be "[a-zA-Z$]+" instead.

Schwartz Prince
Schwartz Prince
Courses Plus Student 2,132 Points

Hi Pedro, Thanks for your help. The code works well now.