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Start your free trialJacob Copeland
1,473 PointsHow do I phrase the condition for the if-statement when trying to throw this exception?
I'm not sure how to say "the string doesn't contain anything other than a letter or '$'".
public class Order {
private String itemName;
private int priceInCents;
private String discountCode;
public Order(String itemName, int priceInCents) {
this.itemName = itemName;
this.priceInCents = priceInCents;
}
public String getItemName() {
return itemName;
}
public int getPriceInCents() {
return priceInCents;
}
public String getDiscountCode() {
return discountCode;
}
private String normalizeDiscountCode(String discountCode) {
if (/*discountCode.indexOf('$') != -1 || ?????????*/) {
throw new IllegalArgumentException("Invalid discount code");
}
this.discountCode = discountCode.toUpperCase();
return this.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
Jean Malan
10,781 PointsWhere you have the $ sign, put - ([^a-zA-Z] +'$' )
Implementing [^a-zA-Z] is basically asking the to see if there is anything that isn't a letter and therefore throws yours iae. We, of course, add in the $ sign because we still want that.
Jacob Copeland
1,473 PointsJacob Copeland
1,473 PointsIt didn't compile :(
./Order.java:24: error: illegal start of expression if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ ./Order.java:24: error: ')' expected if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ ./Order.java:24: error: not a statement if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ ./Order.java:24: error: ';' expected if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ ./Order.java:24: error: cannot find symbol if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ symbol: variable a location: class Order ./Order.java:24: error: cannot find symbol if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ symbol: variable zA location: class Order ./Order.java:24: error: cannot find symbol if (discountCode.indexOf([^a-zA-Z] + '$') != -1) { ^ symbol: variable Z location: class Order Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 7 errors