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10,432 PointsProblem getting java regular expression to work for method: private String normalizeDiscountCode(String code)
I am having difficulties getting this task to work . I have tried a few regex but cant seem to get it right. Need help
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 code){
if(!code.matches("\\[a-zA-Z&&[^0-9]]|\\$")){
throw new IllegalArgumentException("Invalid discount");
}
return code.toUpperCase();
}
}
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(); // $ALE
try {
// This will throw an exception because it contains numbers
order.applyDiscountCode("ABC123");
} catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
try {
// This will throw as well, because it contains a symbol.
order.applyDiscountCode("w@w");
}catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
}
}
1 Answer
Simon Coates
28,694 Pointsi think most people do something like:
private String normalizeDiscountCode(String discountCode) {//throws IllegalArgumentException {
for(char c: discountCode.toCharArray()){
if(c!= '$' && !Character.isLetter(c)){
throw new IllegalArgumentException("Invalid discount code");
}
}
return discountCode.toUpperCase();
}