Function-Introduction

Answers/40230112123/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

Answers/40230112123/src/ResumeMaker.java

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+// Resume Maker : A simple program for make a resume
+import java.security.SecureRandom;
+import java.util.Scanner;
+
+public class ResumeMaker
+{
+    public static void main(String[] args)
+    {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Enter the following information below: ");
+
+        // input name
+        System.out.print("your first name: ");
+        String firstName = input.nextLine();
+
+        System.out.print("your last name: ");
+        String lastName = input.nextLine();
+
+        // store the full name of person
+        String name = fullName(firstName, lastName);
+        System.out.println("your name saved.");
+
+        // input phone number
+        System.out.print("your phone number: ");
+        String phone;
+        while (true)
+        {
+            phone = input.nextLine();
+            phone = phoneNumber(phone);
+            if (phone.equals("false"))
+                System.out.println("Wrong entry. Try again.");
+            else
+            {
+                System.out.println("your phone saved.");
+                break;
+            }
+        }
+
+        // input user id
+        System.out.print("your user ID: ");
+        String id;
+        while (true)
+        {
+            id = input.nextLine();
+            if (userId(id))
+            {
+                System.out.println("your ID saved.");
+                break;
+            }
+            else
+                System.out.println("ID should be between 4 to 13 digits. Try again.");
+        }
+
+        // input interests
+        String interest;
+        System.out.print("your interests(comma separated list): ");
+        interest = input.nextLine();
+        String[] interests = getInterests(interest);
+
+        // show menu
+        menu(name, phone, id, interests);
+    }
+
+    public static void menu(String fullName, String phoneNumber, String userId,
+                            String[] interests)
+    {
+        Scanner input = new Scanner(System.in);
+        String code = "Hello! My name is " + fullName +
+                ".I like " + interests[0] + ".";
+        String decode = "";
+        int shift = 0; // shift value
+
+        while (true)
+        {
+            int choice;
+            System.out.printf("%n1. full information%n2. encode information%n");
+            System.out.printf("3. decode information%n4. exit%n");
+            System.out.printf("%nPlease enter your choice(1-4): ");
+            choice = input.nextInt();
+
+            // select the choice
+            switch (choice) {
+                case 1:
+                    userFullInformation(fullName, phoneNumber, userId, interests);
+                    break;
+                case 2:
+                    System.out.print("Enter the number to shift encode information(0 : random number): ");
+                    shift = input.nextInt();
+                    if (shift == 0) {
+                        SecureRandom randomNumber = new SecureRandom();
+                        shift = 1 + randomNumber.nextInt(25);
+                        System.out.printf("Shift number is %d%n", shift);
+                    }
+                    decode = informationEncoder(code, shift);
+                    break;
+                case 3:
+                    if (decode.equals(""))
+                        System.out.println("You should first code your information.");
+                    else
+                        informationDecoder(decode, shift);
+                    break;
+                case 4:
+                    return;
+                default:
+                    System.out.println("invalid number!");
+            }
+        }
+    }
+
+    public static String fullName(String firstName, String lastName)
+    {
+        firstName = firstName.toLowerCase();
+        lastName = lastName.toLowerCase();
+
+        int firstChar = firstName.charAt(0) - 32;
+        firstName = firstName.substring(1);
+        firstName = ((char) firstChar) + firstName;
+
+        firstChar = lastName.charAt(0) - 32;
+        lastName = lastName.substring(1);
+        lastName = ((char) firstChar) + lastName;
+
+        return (firstName + " " + lastName);
+    }
+
+    public static String phoneNumber(String phone)
+    {
+        if (phone.length() == 10 && phone.charAt(0) == '9')
+            return ("0" + phone);
+        else
+            return ("false");
+    }
+
+    public static boolean userId(String id)
+    {
+        if(4 <= id.length() && id.length() <= 13)
+            return true;
+        else
+            return false;
+    }
+
+    public static String[] getInterests(String interests)
+    {
+        String[] interestArray = interests.split(",");
+        return interestArray;
+    }
+
+    public static void userFullInformation(String fullName, String phoneNumber, String userId,
+                                           String[] interests)
+    {
+        System.out.printf("Hello! My name is %s. My ID is %s. ", fullName, userId);
+        System.out.printf("Here are some of my interests:%n");
+        for (int i = 0; i < interests.length; i++)
+            System.out.printf("%d. %s%n", i + 1, interests[i]);
+        System.out.printf("%nYou can reach me via my phone number %s.%n", phoneNumber);
+    }
+
+    public static String informationEncoder(String information, int shift)
+    {
+        String encodeInformation = "";
+
+        for (int i = 0; i < information.length(); i++)
+        {
+            char character = information.charAt(i);
+            if ('A' <= character && character <= 'Z')
+            {
+                character += shift;
+                if(character > 'Z')
+                    character -= 26; // 26 letters of En alphabetic
+            } else if ('a' <= character && character <= 'z')
+            {
+                character += shift;
+                if(character > 'z')
+                    character -= 26; // 26 letters in En alphabetic
+            }
+            encodeInformation = encodeInformation + character;
+        }
+        System.out.printf("%nCode information : %s%n", encodeInformation);
+        return encodeInformation;
+    }
+
+    public static void informationDecoder(String information, int shift)
+    {
+        char[] decodeInformation = new char[information.length()];
+
+        for (int i = 0; i < information.length(); i++)
+        {
+            char character = information.charAt(i);
+            if ('A' <= character && character <= 'Z')
+            {
+                character -= shift;
+                if(character < 'A')
+                    character += 26; // 26 letters of En alphabetic
+            } else if ('a' <= character && character <= 'z')
+            {
+                character -= shift;
+                if(character < 'a')
+                    character += 26; // 26 letters in En alphabetic
+            }
+            decodeInformation[i] = character;
+        }
+
+        System.out.printf("%nDecode information : ");
+        for (char character : decodeInformation)
+            System.out.print(character);
+        System.out.println();
+    }
+}