Reputation: 3
I am trying to replace a specific character '8' with a '2' in a string. I think I have everything set up correctly and when I look online for examples, this looks like it should. When I print the string though, it is just as I entered it. To run it, test it with "80802" or some similar input. Thanks!
import java.util.Scanner;
class PhoneNumber {
public static void main(String[] args) {
String number = null;
Scanner scan = new Scanner(System.in);
// Prompt the user for a telephone number
System.out.print("Enter your telephone number: ");
// Input the user's name
number = scan.nextLine();
// Replace the relevant letters with numbers
number.replace('8', '2');
System.out.println("Your number is: " + number );
}
}
Upvotes: 0
Views: 1907
Reputation: 55
number.replace('8','2'); returns the correct string it does not modify number. To get your desired functionality you must type number = number.replace('8','2');
public static void main(String[] args) {
String number = null;
Scanner scan = new Scanner(System.in);
// Prompt the user for a telephone number
System.out.print("Enter your telephone number: ");
// Input the user's name
number = scan.nextLine();
// Replace the relevant letters with numbers
number = number.replace('8', '2');
System.out.println("Your number is: " + number );
}
Hope this helps.
Upvotes: 0
Reputation: 424973
A common mistake... You want:
number = number.replace('8', '2');
String.replace() doesn't change the String, because Strings are immutable (they can not be changed). Instead, such methods return a new String with the calculated value.
Upvotes: 6
Reputation: 88378
number.replace()
returns a new string. It does not change `number'.
Upvotes: 2