Java scanner and if-else statements

Question

How would I take a simple if-else statement using a Scanner for keyboard input, compare an integer against an argument and re prompt the user to input the integer again if it is not the desired result? Here is what I have, I think this should be fairly easy but I'm only learning;

 public static void main(String[] args) {

    Scanner myInt = new Scanner(System.in);

    System.out.println("Enter a number between 1 and 10");

    int choice = myInt.nextInt();

    if (choice <= 10) {
        System.out.println("acceptable");
    } else {

                System.out.println("unacceptable");
                System.out.println("Enter a number between 1 and 10");

            }
        }
    }

Any tips on how I should approach this?

Thanks!

Try a loop. Also, don't forget that choice must be >= 1 as well. Currently you would accept 0 (or any negative value). — Elliott Frisch
– Elliott Frisch, Commented Dec 24, 2019 at 1:04

Nosrep · Accepted Answer · 2019-12-24 01:15:09Z

4

You could use a while loop to keep asking for numbers and checking if they are acceptable:

public static void main(String[] args) {

    Scanner myInt = new Scanner(System.in);
    boolean acceptable=false;
    while(!acceptable){
        System.out.println("Enter a number between 1 and 10");

        int choice = myInt.nextInt();

        if (choice <= 10 && choice>=1) {
            System.out.println("acceptable");
            acceptable=true;
        } else {

            System.out.println("unacceptable");

        }
    }
}

edited Dec 24, 2019 at 1:15

answered Dec 24, 2019 at 1:06

Nosrep

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2 Comments

Scary Wombat Over a year ago

Not your logic though. between 1 and 10 != choice <= 10

Nosrep Over a year ago

@ScaryWombat Fixed

jihwanlee · Accepted Answer · 2019-12-24 03:04:33Z

-1

public static void main(String[] args) {
    // TODO Auto-generated method stub

    while (true) {
        if (insertNumber()) {
            break;
        }
    }

}

public static boolean insertNumber() {

    System.out.println("Enter a number between 1 and 10");

    Scanner myInt = new Scanner(System.in);

    int choice = myInt.nextInt();

    if (choice <= 10) {
        System.out.println("acceptable");
        return true;

    } else {
        System.out.println("unacceptable");
        return false;
    }
}

answered Dec 24, 2019 at 3:04

jihwanlee

1

1 Comment

Bitswazsky Over a year ago

This answer is wrong, for the same reason OP's code snippet is wrong, logically. Please be mindful before posting answers.

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