cifojava2021-javase-1

Java SE exercises: Word Operations, to practise static methods and classes

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WordsOpertations

just few exercises of strings: class operations and editing (subString, indexOf, length, etc)

WordsOpertations2

refactor WordsOperations to emailManagement

`public class AccountManagment { // scope #3

// ----------------------------------------------
// ---------  INICIO DEL TRABAJO ----------------
// ----------------------------------------------

public static void createAccount(String userToCreateAccount) {
	// scope #4

	String user = createUser(userToCreateAccount);
	String email = createEmail(userToCreateAccount);
	String password = createPassword();
	printUserAccount(user, email, password);
}

// ------------------------------------------------
// ----------- HARRAMIENTAS ----------------------
// ------------------------------------------------

public static String createUser(String createUser) {
	// scope #5

	int blank = createUser.indexOf(" ");
	String user = createUser.substring(0, blank);

	return user;
}

public static String createEmail(String createEmail) {
	// scope #6

	int blank = createEmail.indexOf(" ");
	String surname = createEmail.substring(blank + 1, createEmail.length());
	String email = createEmail.charAt(0) + surname + "@java.com";

	return email;
}

public static String createPassword() {
	// scope #7

	String password = "";

	password = password + createCharRandom() + createIntRandom(10000) + createCharRandom() + createCharRandom()
			+ createIntRandom(596);

	return password;
}

public static void printUserAccount(String user, String email, String password) {
	// scope #8

	System.out.println("User Account: ");
	System.out.println("User : " + user);
	System.out.println("Email: " + email);
	System.out.println("Password: " + password);

}

// ------------------------------------------------
// ----------- MAS HARRAMIENTAS -------------------
// ------------------------------------------------

public static int createIntRandom(int top) {
	// scope #9
	Random rand = new Random();

	// Generate random integers in range 0 to top, if top=10 random 0 to 9
	int intRandom = rand.nextInt(top);
	return intRandom;

}

public static char createCharRandom() {
	// scope #9
	// Random rand = new Random();
	// String alphabetChars =
	// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	// String alphabetChars2 = "!·$%&/()=?¿?=)()/*-+^*Ǩ_:;;:_+/";
	String alphabetChars3 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!·$%&/()=?¿?=)()/*-+^*Ǩ_:;;:_+/+/";

	// Generate random char in range 0 to top, if top=10 random 0 to 9

	char charRandom = alphabetChars3.charAt(createIntRandom(alphabetChars3.length()));

	return charRandom;

}

}`

WordsOpertations3

create serveral classes to order emailManagement functionality:

• AccountCreation.java
• AccountDeleting.java (to-do)
• AccountManagment.java
• AccountUpdating.java (to-do)
• Init.java
• Utils.java

just empty classes to implement, so to-do: AccountDeleting.java and AccountUpdating.java

WordsOpertations4

we define our init as a kind of controller that tells us what to execute and most important, the order of execution (sync):

public class Init { // scope #1 public static void main(String[] args) {

	`// scope #2
	Scanner reader = new Scanner(System.in);
	
	System.out.println("Type user (name and surname) to create Account ...");
	String userToCreateAccount = reader.nextLine();
	
	String account = AccountManagment.createAccount(userToCreateAccount);
	
	//System.out.println(account);
	
	String user = Utils.fromStringToUser (account);
	String password = Utils.fromStringToPassword (account);
	
	boolean  isValidated  =  Login.validateAccount (reader, user, password);
	
	if (isValidated) {
		
		//to-do
		//AccountUpdating
		//AccountDeleting
		
		isValidated = false;
	} 
	
	System.out.println("\nBye bye my friend...");
	reader.close();
}`

}

and we add a new functionality so we need a new class: login.java

• AccountCreation.java
• AccountDeleting.java (to-do)
• AccountManagment.java
• AccountUpdating.java (to-do)
• Init.java
• Login.java (to-do)
• Utils.java

WordsOpertations5

we implement login class and methods:

String user = Utils.fromStringToUser (account); String password = Utils.fromStringToPassword (account);

`public static boolean validateAccount(Scanner reader, String user, String password) {

	//System.out.println(user);
	//System.out.println(password);

	int count = 1;
	String userConsole;
	String passwordConsole;
	System.out.println("\nLogin:");

	do {

		System.out.println("\nEnter Username : ");
		userConsole = reader.next();

		System.out.println("Enter Password : ");
		passwordConsole = reader.next();

		if (userConsole.equals(user) && passwordConsole.equals(password)) {
			System.out.println("Access Granted! Welcome!");
			return true;

		} else if (userConsole.equals(user)) {
			System.out.println("Invalid Password!");
		} else if (passwordConsole.equals(password)) {
			System.out.println("Invalid Username!");
		} else {
			System.out.println("Invalid Username & Password!");
		}
		
		System.out.println("Total attempts: " + count + "/3");
		count++;

		if (count == 4) System.out.println("Account blocked!");
		
	} while (count < 4);
	
	

	return false;
}`

WordsOpertations6

we implement update class

WordsOpertations7

we implement delete class

WordsOpertations8

we migrate from String account (toString with user, email and password strings)

to ArrayList<String> account (arryList wiht four positions, 0, 1, 2 and 3 with name&surname, user, email, password)

we need to change some classes:

WordsOpertations9

final writing, comments and create Controller class in order to clean Init class

`package wordsoperations;

import java.util.ArrayList; import java.util.Scanner;

public class Init { // scope #1 public static void main(String[] args) {

	Controller.AppStarting();

	System.out.println("\nBye bye my friend...");

}

}`