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Start your free trialJean Malan
10,781 PointsSimplifying my code
So I had to ensure that input that was passed could only contain characters A-Z and the symbol $.
The input was a String variable so I ran the .toCharArray method to determine which characters were passed in the input. I then ran Character.isLetter method to make sure it was only letters and the != $ method to state that only that symbol could be passed.
My code was successful however, it took me longer than I expected and I included some methods that weren't really taught in the course yet ( I read external forums/articles to get this).
I would like to know (assuming that there is), what would be the simplified version of the code I ran?
I do not want to get in the habit of writing convoluted code to get a basic idea out.
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 = discountCode;
this.discountCode = normalizeDiscountCode("discountCode");
}
private String normalizeDiscountCode (String applyDiscountCode) {
char[] chars = discountCode.toCharArray();
for (char c : chars) {
if (!Character.isLetter(c) && c != '$') {
throw new IllegalArgumentException ("Invalid discount code");
}
}
this.discountCode = discountCode.toUpperCase();
return 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(); // $ALE
try {
// This will throw an exception because it contains numbers
order.applyDiscountCode("ABC123");
} catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
try {
// This will throw as well, because it contains a symbol.
order.applyDiscountCode("w@w");
}catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
}
}
1 Answer
Simon Coates
28,694 Pointsi think a fairly standard answer is:
public void applyDiscountCode(String discountCode) {
this.discountCode = normalizeDiscountCode(discountCode);
}
private String normalizeDiscountCode (String discountCode) {
for (char c : discountCode.toCharArray()) {
if (!Character.isLetter(c) && c != '$') {
throw new IllegalArgumentException ("Invalid discount code");
}
}
return discountCode.toUpperCase();
}
Jean Malan
10,781 PointsJean Malan
10,781 PointsOkay perfect! thanks a lot :)