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Answers/40230112119/Main.java

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+package org.example;
+import java.util.ArrayList;
+import java.util.Scanner;
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter your first name: ");
+        String firstName = sc.nextLine();
+        System.out.println("Enter your last name: ");
+        String lastName = sc.nextLine();
+        String FullName = fullName(firstName, lastName);
+        System.out.println("Full Name: " + FullName);
+
+        System.out.println("Enter your phone number: ");
+        char[] num = sc.next().toCharArray();
+        char[] PN = phoneNumber(num);
+        System.out.println(PN);
+
+        System.out.println("Enter your ID: ");
+        int ID = sc.nextInt();
+        int userID = userid(ID);
+
+        System.out.println("Enter your interest: ");
+        String interest = sc.next();
+        ArrayList<String> interests = new ArrayList<>();
+        interests = getInterests(interest);
+        System.out.println(interests);
+
+        String full = userFullInformation(FullName, PN, userID, interests).toString();
+        System.out.println(full);
+
+        Scanner s = new Scanner(System.in);
+        System.out.println("Enter a text to be encrypted: ");
+        String information = s.nextLine();
+        System.out.println("Enter wanted shift: ");
+        int shift = s.nextInt();
+        informationEncoder(information, shift);
+
+        Scanner ss = new Scanner(System.in);
+        System.out.println("Enter encoded text: ");
+        information = ss.nextLine();
+        System.out.println("Enter wanted shift: ");
+        shift = ss.nextInt();
+        informationDecoder(information, shift);
+
+        Scanner sss = new Scanner(System.in);
+        System.out.println("\nDo you want to see the encoded form of your info?" +
+                "\nEnter 'yes' or 'no'.");
+        String ans = sss.nextLine();
+        if (ans.equals("yes")) {
+            System.out.println("Ok then! Enter wanted shift: ");
+            shift = s.nextInt();
+            informationEncoder(full, shift);
+        }
+
+    }
+
+    static String fullName(String firstName, String lastName) {
+        char[] first = firstName.toCharArray();
+        char[] last = lastName.toCharArray();
+        first[0] = Character.toUpperCase(first[0]);
+        last[0] = Character.toUpperCase(last[0]);
+        for (int i = 1; i < first.length; i++) {
+            first[i] = Character.toLowerCase(first[i]);
+        }
+        for (int i = 1; i < last.length; i++) {
+            last[i] = Character.toLowerCase(last[i]);
+        }
+        String fullName = String.valueOf(first) + " " + String.valueOf(last);
+        return fullName;
+    }
+    static char[] phoneNumber(char[] num) {
+        Scanner sc = new Scanner(System.in);
+        if (num.length == 10 && num[0] == '9') {
+            char[] newNum = new char[num.length + 1];
+            newNum[0] = '0';
+            System.arraycopy(num, 0, newNum, 1, 10);
+            return newNum;
+        }
+        else {
+            System.out.println("Invalid number. Try again: ");
+            num = sc.next().toCharArray();
+            return phoneNumber(num);
+        }
+    }
+    static int userid(int ID) {
+        Scanner sc = new Scanner(System.in);
+        int count = 0;
+        int tmp = ID;
+        for (; tmp > 0; tmp /= 10) {
+            count++;
+        }
+        if (count > 3 && count < 14)
+            return ID;
+        else {
+            System.out.println("Invalid ID. Try again: ");
+            ID = sc.nextInt();
+            return userid(ID);
+        }
+    }
+    static ArrayList<String> getInterests(String interest) {
+        Scanner sc = new Scanner(System.in);
+        ArrayList<String> interests = new ArrayList<>();
+        interests.add(interest);
+        int count = 1;
+        while (count < 10) {
+            System.out.println("Enter another interest: (if there's none, enter 'done')");
+            String word = sc.nextLine();
+            if (word.equals("done"))
+                break;
+            else {
+                interests.add(word);
+                count++;
+            }
+        }
+        return interests;
+    }
+    static StringBuilder userFullInformation(String FullName, char[] PN, int userID, ArrayList<String> interests) {
+        StringBuilder full = new StringBuilder();
+        full.append("\n\nHello! My name is ");
+        full.append(FullName);
+        full.append(". My ID is ");
+        full.append(userID);
+        full.append(". Here are some of my interests: ");
+        for (int i = 0; i < interests.size(); i++) {
+            full.append("\n");
+            full.append((i+1));
+            full.append(". ");
+            full.append(interests.get(i));
+        }
+        full.append("\n\nYou can reach me via my phone number ");
+        for (char c : PN) {
+            full.append(c);
+        }
+        full.append(".");
+        return full;
+    }
+    static void informationEncoder(String information,int shift) {
+        StringBuffer encrypted = new StringBuffer();
+        for (int i = 0; i < information.length(); i++) {
+            if (((int)information.charAt(i) > 90 && (int)information.charAt(i) < 97) ||
+                    ((int)information.charAt(i)  < 65) ||
+                    ((int)information.charAt(i) > 122)) {
+                encrypted.append(information.charAt(i));
+                continue;
+            }
+            else if (Character.isUpperCase(information.charAt(i))) {
+                char a = (char)(((int)information.charAt(i) + shift - 65) % 26 + 65);
+                encrypted.append(a);
+            }
+            else {
+                char a = (char)(((int)information.charAt(i) + shift - 97) % 26 + 97);
+                encrypted.append(a);
+            }
+        }
+        System.out.println("Encrypted text: " + encrypted);
+    }
+    static void informationDecoder(String information, int shift) {
+        StringBuffer decoded = new StringBuffer();
+        for (int i = 0; i < information.length(); i++) {
+            if (((int)information.charAt(i) > 90 && (int)information.charAt(i) < 97) ||
+                    ((int)information.charAt(i)  < 65) ||
+                    ((int)information.charAt(i) > 122)) {
+                decoded.append(information.charAt(i));
+                continue;
+            }
+            else if (Character.isUpperCase(information.charAt(i))) {
+                char a = (char)(((int)information.charAt(i) - shift - 65 + 26) % 26 + 65);
+                decoded.append(a);
+            }
+            else {
+                char a = (char)(((int)information.charAt(i) - shift - 97 + 26) % 26 + 97);
+                decoded.append(a);
+            }
+        }
+        System.out.println("decoded text: " + decoded);
+    }
+}