How can i use a variable that stores a users input in a while loop?

Question

I have a scanner that gets a users input x which if input correctly outputs "correct" and if the input is not right, it will output "incorrect". However whether i type the correct or incorrect string im stuck in an endless loop of the while loop outputting "incorrect".

How can i check if a users input is correct and if so, output the word "correct" and move onto the next part of the program. If the input is incorrect, output "incorrect" and repeat the loop until the input is correct.

Hopefully this makes sense!

Code:

    Scanner sc = new Scanner(System.in);

    int n = 0;
    String x = sc.nextLine();
    while(n == 0){
        if (x == "inv"){
            System.out.println("correct");
            n++;
        }else{
            System.out.println("incorrect");
        }
    }

x == "inv" is wrong. https://stackoverflow.com/questions/767372/java-string-equals-versus — caot, Nov 18 '17 at 23:51

score 0 · Answer 1 · answered Nov 18 '17 at 23:52

0

I needed to use x.equals("Inv") rather than x == "Inv"

answered Nov 18 '17 at 23:52

user7431342

43
8

1

It is much better to use "Inv".equals(x) – caot Nov 18 '17 at 23:54
What is the difference, im just curious? – user7431342 Nov 19 '17 at 00:01
if x is null, it fails with NullPointerException. "Inv" can never be null, so it's safe. – caot Nov 19 '17 at 00:10
@caot gotcha, thank you :) – user7431342 Nov 19 '17 at 13:02

How can i use a variable that stores a users input in a while loop?

1 Answers1