Using char instead of an String for end a do while loop. It's possible? Java

Question

So in this do while code the boolean is an input of the user, but it's only needed one input. If the user press [c] the do while continues but if press any other key stops. I have already the code to do with a String c = ""; but I want to be done with a char. Also the other problem happens when I use char c []; it's not possible to use the c = kb.next().toUpperCase();

Here is the exemple code I did.

Scanner kb = new Scanner(System.in);
String c = "";

do {
     //some code.
     //here asks to the user to continue or not.
     System.out.println("Press [c] to continue, any key to exit.");

     c = kb.next().toUpperCase();
} while ( c.equals == ("C") );

Maybe it's already aswered I tried to find an answer... Maybe I'm to Junior. But I wan't to know how I can do it. (please if it's already duplicate tell me don't unvote)

score 1 · Answer 1 · answered Nov 05 '17 at 21:34

1

Yes this is possible, very close. You need to compare strings using the String.equals, or String.equalsIgnoreCase rather than what you attempted. Refer to How do I compare strings in Java?

public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);
    String c = "";

    do {
        //some code.
        //here asks to the user to continue or not.
        System.out.println("Press [c] to continue, any key to exit.");

        c = kb.next().toUpperCase();
    } while (!c.equalsIgnoreCase("C"));
}

With chars

public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);
    char chr;

    do {
        //some code.
        //here asks to the user to continue or not.
        System.out.println("Press [c] to continue, any key to exit.");

        chr = kb.next().toCharArray()[0];
    } while (chr != 'c');
}

answered Nov 05 '17 at 21:34

kbz

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I want to use a `char` instead of a `String` – mcGuffin Nov 05 '17 at 21:39
1

It's in the answer, sorry I missed that part. – kbz Nov 05 '17 at 21:39
Okey but now the thinks is, if the user input _C_ ? It's gonna start again. – mcGuffin Nov 05 '17 at 21:42
Because of the **chr != 'c'** condition, you just need to change it to **chr == 'c'** – kbz Nov 05 '17 at 21:51

score 1 · Accepted Answer · answered Nov 05 '17 at 21:38

If you would like to use char c instead of String c, this code:

char c;
do {
     System.out.println("Press [c] to continue, any key to exit.");
     c = kb.next(".").toUpperCase().charAt(0);
} while (c == 'C');

The idea is to pass "." to next(...) method to consume exactly one character.

Using char instead of an String for end a do while loop. It's possible? Java

2 Answers2