Find a String length Using Recursion in Java

Problem:

Write a method that finds the string length Using Recursion in Java

Output:

Not applicable.

Solution:

public class string_length_recursion
{
  public static int length (String str)
  {
    if (str == null || str.equals(""))
    {
      return 0;
    }
    
    else
      return 1 + length(str.substring(1));
  }
  
  public static void main(String[] args)
  {
    System.out.println(length("Few"));
  }
}