Return the position first position two strings are different

i can't figure out how i am supposed to return the first position org and check are different. Do i have to use substrings?

import acm.program.*;

public class CheckPasswords extends ConsoleProgram
{
  public void run()
  {  

   while(true)
   {
      String org = readLine("Enter Password: ");
      String check = readLine("Confirm Password: ");

      if(org.equals(check))
      {
        println("Password Confirmed");
      }
      else
      {
        println("Passwords do not Match");
        //???
      }
   }
  }
}

If you want to just check if they are equal or not , you can use:

int val = org.compareTo(check);

It will return 0 if they are equal, negative value if org is before check , else positive value if org is after check.

If you really want to return the first position where they are unequal, use this function:

int firstMismatch(String org, String check)
{
    int limit = (org.length()>check.length())?org.length():check.length();
    for(int i=0;i<limit;i++)
    {
        try{
        if(org.charAt(i)!=check.charAt(i))
        {
             return i; //If one of the strings end, that's the position they are different, otherwise there is a mismatch. Either way, just return the index of mismatch
        }
        }
        catch(Exception e)
        {
             if(org.length()!=check.length())
            {

             return(i); //Execution comes here only when length of strings is unequal
         //Exception occurs because first string is smaller than
         // the second or vice versa. Say if you use "fred" and"fredd" as org and check 
         //respectively, "fred" is smaller than "fredd" so accessing org[4] is not allowed.   
         //Hence the exception.
          }

           System.out.println("Problem encountered"); //Some other exception has occured.
          return(-2);
        }  
    }
    return(-1); //if they are equal, just return -1



}

EDIT : And in your code, call as follows:

public class CheckPasswords extends ConsoleProgram
{
  public void run()
  {  

  while(true)
  {
  String org = readLine("Enter Password: ");
  String check = readLine("Confirm Password: ");
  int mismatchPosition = firstMisMatch(org,check);  
  if(mismatchPosition==-1)
  {
    println("Password Confirmed");
  }
  else
  {
    println("Passwords do not match from position "+mismatchPosition);

      }
   }
  }
}