How to test whether the entered value is numeric or it contains some characters.

here is the code which i have written

Code:

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import java.util.Scanner;

public class Assignment {

    public static void main(String[] args) {
        int row, column;
       
        int s=0;
        boolean found = false;
        String rollNumber;
       
        while (!found) {

            try {
                Scanner scan = new Scanner(System.in);
                System.out.print("Enter the size of the array s: ");
              String size = scan.next();
               
                System.out.println("size is :" +size);
              System.out.println();
                 
              found = true;
               
            } catch (NumberFormatException nfe) {
                System.out.print("Please enter the number again in correct format:");
                System.out.println();


            }

        }
       
      // int[][] arr = new int[size][3];
       

    }
}

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What's your question? Where are you stuck? What have you tried?

See the APIs for String and Character for useful functions.

got the answer.

So post it (along with clarification of the question) so if someone else with the same problem can also get help.