I am currently compiling a PasswordChecker Java program.

The program has three rules:

1. must have 3 characters.

2. must have at least 1 UPPERCASE letter.

3. must have at least 1 lowercase letter.

The program executes the first system.out.print but the program fails when I put in 3 characters w/1uppercase & 1digit. I can't see where I am going wrong. Please assist!

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package passwordchecker;

import java.util.Scanner;

public class PasswordChecker {

public static void main(String[] args) {

Scanner scnr = new Scanner(System.in);

String password; //Initiates string and boolean

int passwordLength = 0;

boolean upperCheck = false;

boolean digitCheck = false;

boolean lengthCheck = false;

System.out.println("Please enter a 3 character password with at least one UPPERCASE letter and one digit: ");

password = scnr.nextLine();

if (password.length()== 3){

lengthCheck = true;

if (Character.isUpperCase(0)){

upperCheck = true;

}

if (Character.isUpperCase(1)){

upperCheck = true;

}

if (Character.isUpperCase(2)){

upperCheck = true;

}

if (Character.isDigit(password.charAt(0))){

digitCheck = true;

}

if (Character.isDigit(password.charAt(1))){

digitCheck = true;

}

if (Character.isDigit(password.charAt(2))){

digitCheck = true;

}

}

if (lengthCheck == true && upperCheck == true && digitCheck == true){

System.out.println("The password provided is valid.");

}

else {

System.out.println("The password provided is invalid. Please try again.");

}

}

}

"The password provided is invalid. Please try again"