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Start your free trialmichael lee
5,179 PointsCorrect me if I'm wrong
just want to make sure. in the code below, the keyword "this" will make the "this.discountCode" become "*1*discountCode" , if without "this" keyword it'll mean "*2*discountCode".
public class Order {
private String itemName;
private int priceInCents;
private String *1*discountCode;
public void applyDiscountCode(String *2*discountCode) {
this.discountCode = normalizeDiscountCode(*3*discountCode);
}
private String normalizeDiscountCode(String *4*discountCode){
return *5*discountCode.toUpperCase();
}
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) {
normalizeDiscountCode(discountCode);
this.discountCode = normalizeDiscountCode(discountCode);
}
private String normalizeDiscountCode(String discountCode){
return discountCode.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
Bob Allan
10,900 Pointsthis.discountCode will only assign a value to the field 'discountCode'
much like
this.discountCode555 will only assign a value to the field 'dicountCode555'
Also, to improve the readability of your code a little, a variable *8*whateverStuff is much more readable when written as whateverStuff8.