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Start your free trialTyler Comley
1,413 PointsHelp with compiling errors regarding my isLetter method.
So, I am trying to see if the code that I have typed up in the normalizeDiscountCode method works and is is giving me a compiler error saying it is expecting a variable and I am giving it a value. What I don't understand is why is it not working here and how should I rewrite my code so it does work? I was cross checking with the workspace in the Game.java file and the if statement "if (! Character.isLetter(letter))" has no issues. I can't even get the isLetter boolean method to work let alone try to get it to work with the "= false" or "!= true" comparisons to work. What am I doing wrong or what am I missing?
public class Order {
private String itemName;
private int priceInCents;
private String discountCode;
private String normalizeDiscountCode(String discountCode) {
discountCode = discountCode.toUpperCase();
for (int i = 0; i <= discountCode.length();) {
char discountChar = discountCode.charAt(i);
if (Character.isLetter(discountChar) = false){
throw new IllegalArgumentException("Invalid discount code");
}
i++;
}
return 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);
}
}
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
karol Zajączkowski
3,236 Pointsif (Character.isLetter(discountChar) == false) - '=' you assign value and '==' you check if argument is true. for (int i = 0; i <= discountCode.length()-1;) - because char discountChar = discountCode.charAt(i); -> it starts from 0 and length() counts from 1.