Validating that a users input is a number and within a range.

Question:

How do I validate an input ensuring a user enters a number in the range 1-10?

Answer:

See example:

Code:

import java.util.*;
 
public class ReadInt {
 
   public static void main(String[] args) {
 
      Scanner sc = new Scanner(System.in);
 
      int number = 0;
      while (true) {
         try {
            System.out.print("Enter number betwen 1 and 10: ");
            number = sc.nextInt();
            if( number >= 1 && number <= 10){
              break;
            }
            System.out.println("Out of range.");
 
         } catch (InputMismatchException e) {
            System.out.println("You did not enter a Integer.");
            sc.nextLine(); // needed to clear buffer
         }
      }
      System.out.println("You entered: " + number);
   }
}

Output:

$ java ReadInt
Enter number betwen 1 and 10: 11
Out of range.
Enter number betwen 1 and 10: a
You did not enter a Integer.
Enter number betwen 1 and 10: 12
Out of range.
Enter number betwen 1 and 10: 10
You entered: 10