Question

Programming language is Java.

Consider you have already created a validateString(String str) method that validates a String to ensure it contains exactly 4 characters.

Create code that calls this method, sending user input as an argument (actual parameter). The user should be continuously prompted to enter a different string and informed of an error if the method returns false.

Answer 1

Code:

import java.util.Scanner;

class Main {
  public static boolean validateString(String str) 
  {
    if(str.length() == 4)
    {
      return true;
    }
    return false;
  }
  public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   String str;
   boolean x = true;
   while(x)
   {
     System.out.println("Enter String: ");
     str = sc.next();
     x = validateString(str);
     System.out.println(x);
   }
}
}

Screenshots: