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19,702 PointsApplying disount error
What do i wrong?
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) {
for (char letter: discountCode.toCharArray()){
if ( ! Character.isLetter(discountCode) && !discountCode.contains('$'))
throw new IllegalArgumentException("invalid discount code");
}
return this.discountCode = discountCode.toUpperCase();
}
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(); // $ALE
try {
// This will throw an exception because it contains numbers
order.applyDiscountCode("ABC123");
} catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
try {
// This will throw as well, because it contains a symbol.
order.applyDiscountCode("w@w");
}catch (IllegalArgumentException iae) {
System.out.println(iae.getMessage()); // Prints "Invalid discount code"
}
}
}
1 Answer
Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 PointsI'm seeing these errors in the Preview window:
./Order.java:24: error: no suitable method found for isLetter(String)
if ( ! Character.isLetter(discountCode) && !discountCode.contains('$'))
^
method Character.isLetter(char) is not applicable
(argument mismatch; String cannot be converted to char)
method Character.isLetter(int) is not applicable
(argument mismatch; String cannot be converted to int)
./Order.java:24: error: incompatible types: char cannot be converted to CharSequence
if ( ! Character.isLetter(discountCode) && !discountCode.contains('$'))
^
Note: JavaTester.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
The first error is that you're passing in discountCode
, the entire string, into isLetter rather then letter
, the single char variable you made as we're iterating through the string. The second error is that you're passing in a single char into the contains
method instead of a sequences of chars that it expects. I suggest you just simply test to see if that same letter
variable equals '$' rather than using the contains
method.
if ( ! Character.isLetter(letter) && letter != '$')