While loop data validation

Question

I'm using a while loop to validate data ensuring the user enters only a number between 1 and 6. The loop catches the invalid entry no problem, but then when a correct number is entered it needs to be entered a second time in order to proceed. If I take out || menuScan.nextInt() > 6 the loop will work exactly as I need it to but I need to include this line in the loop.

while (!menuScan.hasNextInt() || menuScan.nextInt() > 6) {
    menuScan.nextLine();
    System.err.println("Please enter a valid menu option 1 - 6: "); 
}

menuChoice = menuScan.nextInt();

I guess will need more context to answer that one... Could you post the rest of your method? Which method triggers the prompt to enter a new value? — Stefan Haberl
– Stefan Haberl, Commented Dec 22, 2015 at 11:52

vojta · Accepted Answer · 2015-12-22 11:53:11Z

3

Assign the value to your variable in the moment you read it for the first time:

while (!menuScan.hasNextInt() || (menuChoice = menuScan.nextInt()) > 6) {
    menuScan.nextLine();
    System.err.println("Please enter a valid menu option 1 - 6: "); 
}

answered Dec 22, 2015 at 11:53

vojta

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