Question

In.java

Write a program that repeatedly asks the user to enter their password until they enter the correct one. However, after 5 failed attempts, the program "locks out" the user. We will show that with an error message.
Assume the password is HOC2141 (case sensitive).
Note that there is a special case that is not shown below. To identify it, think of all possible scenarios of input for this program.

----------- Sample run 1:
Enter your password: Blake
Wrong
Enter your password: hoc2341
Wrong
Enter your password: hoc2141
Wrong
Enter your password: HOC2141
Correct! You're in!
Bye 

----------- Sample run 2:
Enter your password: HOC2141
Correct! You're in!
Bye
 
----------- Sample run 3:
Enter your password: asdf
Wrong
Enter your password: ffgdf
Wrong
Enter your password: asdxcv
Wrong
Enter your password: 1276
Wrong
Enter your password: HOCK
Wrong
You are locked out!
Bye
 

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// Login.java

import java.util.Scanner;

public class Login {

      public static void main(String[] args) {

            // storing original password

            String password = "HOC2141";

            // scanner for input

            Scanner scanner = new Scanner(System.in);

            String userInput;

            int attempts = 0;

            boolean in = false;

            // looping until 5 attempts are exhausted or user enter it correctly

            while (attempts < 5) {

                  // asking and reading password

                  System.out.print("Enter your password: ");

                  userInput = scanner.nextLine();

                  // comparing password with original

                  if (userInput.equals(password)) {

                        // success

                        System.out.println("Correct! You're in!");

                        in = true;

                        break; // exiting loop

                  } else {

                        // wrong

                        System.out.println("Wrong");

                  }

                  // incrementing number of attempts

                  attempts++;

            }

            // if in is not true, and the loop is over, printing 'You are locked

            // out!'

            if (!in) {

                  System.out.println("You are locked out!");

            }

            System.out.println("Bye");

      }

}

/*OUTPUT 1*/

Enter your password: hdjsd

Wrong

Enter your password: HOC2141

Correct! You're in!

Bye

/*OUTPUT 2*/

Enter your password: hoc2141

Wrong

Enter your password: hOC2141

Wrong

Enter your password: HOC2141

Correct! You're in!

Bye

/*OUTPUT 3*/

Enter your password: hsjks

Wrong

Enter your password: jhfjk

Wrong

Enter your password: whuw

Wrong

Enter your password: sdh

Wrong

Enter your password: wduwhdj

Wrong

You are locked out!

Bye