Answered: Below is the CustomerNumber Program. In…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Below is the CustomerNumber Program. In the attached pictures is the assignment I am struggling with.

import java.util.Scanner;

/** * This program tests a customer number to determine

* whether it is in the proper format.

public class CustomerNumber

{

public static void main(String[] args)

{

String customer; // To hold a customer number

// Create a Scanner object for keyboard input.

Scanner keyboard = new Scanner(System.in);

System.out.println("Enter a customer number in " + "the form LLLNNNN"); System.out.print("(LLL = letters and NNNN " + "= numbers): ");

// Get a customer number from the user.

customer = keyboard.nextLine();

// Determine whether it is valid. if (isValid(customer))

{

System.out.println("That's a valid customer " + "number.");

}

else

{

System.out.println("That is not the proper " + "format."); System.out.println("Here is an example: " + "ABC1234");

}

/** * The isValid method accepts a String as its argument

* and tests its contents for a valid customer number.

private static boolean isValid(String custNumber)

{

boolean goodSoFar = true; // Flag

int index = 0; // Loop control variable

// Is the string the correct length?

if (custNumber.length() != 7)

goodSoFar = false;

// Test the first three characters for letters.

while (goodSoFar && index < 3)

{

if (!Character.isLetter(custNumber.charAt(index)))

goodSoFar = false;

index++;

} // Test the last four characters for digits. while (goodSoFar && index < 7) { if (!Character.isDigit(custNumber.charAt(index))) goodSoFar = false; index++; } // Return the results return goodSoFar; }}

You will create a password verification program using character testing.
Start with the program CustomerNumber.java.
Naming:
• Name the Java project: LastFProjectAssign07
• Name the driver program (main): LastFAssign07.java
• Where Last is your last name and F is the first initial of your first name. Ex: OgleD
• Save in a file folder on your storage device.
Instructions:
The user will enter a password as a String. You must test that the password contains at least:
• The password should be at least 6 characters long.
• One lowercase letter
• One uppercase letter
• One number (0-9)
• The password can contain no spaces
Hint: you will need a loop and one or more boolean flags.
Tell the user what they entered incorrectly.
Sample output 1:
Enter a password:
123rr
Invalid Length.
Password must contain at least one upper, one lower, and one digit.
That is not the proper format.

Sample output 2:
Enter a password:
123 rT
Password may not contain spaces.
That is not the proper format.
Sample output 3:
Enter a password:
RRtt23456
That's a valid password.
Test the program and make sure it runs.

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