Detecting the user input as an error for string input in java

Question

What can I do to detect string input as an error, where the user has to enter an int value? What is the condition I can use to detect whether the user has entered a string value?

Scanner input = new Scanner(System.in); 
int characterNum = input.nextInt();

do{

 if ((characterNum < 0)&&(characterNum > 12)){
 System.out.println("Invalid Input, Try again");

  }

 characterNum = input.nextInt();

 }while((characterNum < 0)&&(characterNum > 12));

What I understood is, you are trying to get user input but you want to make sure it is a numeric value? — ElSheikh
– ElSheikh, Commented May 3, 2018 at 7:45

Abhilash Arjaria · Accepted Answer · 2018-05-03 07:48:23Z

-2

By Using instanceof :

Use "s instanceof String" , where s is variable entered by user to check wither it is String or not

answered May 3, 2018 at 7:48

Abhilash Arjaria

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1 Comment

khelwood Over a year ago

If the OP takes a string as input, and they want to know if it is or is not parsable as an integer, instanceof String is obviously going to be true. If they try and take input as something other than a string, it will be false. Either way, it is not helpful.

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