I have created a brute-force password cracker in Java, however, the while loop does not end when it finds the correct password

Question

Below is the source for the program. However when I run the program and use a password, for example "x", it will show "x" in the list of guessed passwords but it wont realize that "x" is the correct answer. I put in a if-else loop to break the while loop when the correct password is found, but it still doesn't stop. Any advice? Thanks in advance.

import java.util.*;
import java.io.*;
class pwcracker
{
public static void main (String[] args)
{
    Scanner scan = new Scanner( System.in );
    Random rand = new Random();

  Runtime.getRuntime().availableProcessors();

  String pw, choices, guess;
    long tries;
    int j, length;

    System.out.println("Enter a password that is up to 5 chars and contains no numbers: ");
    pw = "" + scan.nextLine();
    length = pw.length();

    choices = "abcdefghijklmnopqrstuvwxyz";
    tries = 0;
    guess = "";

    System.out.println("Your pw is: " + pw);
    System.out.println("The length of your pw is: " + length);

  System.out.println("for TEST- Guess: " + guess + "pw :"+pw);


  if (guess !=  pw){

  while  (guess !=  pw) 
    { 
        j = 0;
        guess = "";

        while ( j < length )
        {
            guess = guess + choices.charAt( rand.nextInt ( choices.length() ) );
            j = j + 1;

        if (guess == pw)
     {
       System.out.println("Match found, ending loop..");
       break;
     }

        }
                System.out.println("2 Guess: " + guess + " pw :"+pw);       //this is for me to view the actual guesses
        tries = tries + 1;                      
    }
  }
    System.out.println("Here is your password: " + guess);
    System.out.println("It took " + tries + " tries to guess it.");
}
}