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Answers/40230112037/Functions-Introduction/.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

Answers/40230112037/Functions-Introduction/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>Functions-Introduction</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

Answers/40230112037/Functions-Introduction/src/main/java/Main.java

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+import java.util.Arrays;
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        boolean done = false;
+        String[] interests = new String[0];
+        String firstname, lastname, fullname = "", id = "", phone = "";
+        boolean fullNameDone, idDone, phoneDone, interestsDone;
+        fullNameDone = idDone = phoneDone = interestsDone = false;
+        while (!done) {
+            try {
+                if (!fullNameDone) {
+                    System.out.print("First Name: ");
+                    firstname = scanner.nextLine();
+                    System.out.print("Last Name: ");
+                    lastname = scanner.nextLine();
+                    fullname = fullName(firstname, lastname);
+                    fullNameDone = true;
+                }
+                if (!phoneDone) {
+                    System.out.print("Phone number: ");
+                    phone = phoneNumber(scanner.nextLine());
+                    phoneDone = true;
+                }
+                if (!idDone) {
+                    System.out.print("User ID: ");
+                    id = userId(scanner.nextLine());
+                    idDone = true;
+                }
+                if (!interestsDone) {
+                    System.out.println("Interests: (Enter an empty line to stop)");
+                    interests = getInterests(10);
+                    interestsDone = true;
+                }
+                done = true;
+            } catch (Error error) {
+                System.out.println(error.getMessage());
+            } catch (Exception exception) {
+                System.out.println("Wrong Input!");
+            }
+        }
+        done = false;
+        while (!done) {
+            try {
+                System.out.print("Do you want to get the output encoded? [Y/n] ");
+                String input = scanner.nextLine();
+                if (input.isBlank() || input.startsWith("y") || input.startsWith("Y")) {
+                    System.out.print("Enter shift value: ");
+                    int shift = scanner.nextInt();
+                    System.out.println(informationEncoder(userFullInformation(fullname, phone, id, interests), shift));
+                    done = true;
+                } else if (input.startsWith("n") || input.startsWith("N")) {
+                    System.out.println(userFullInformation(fullname, phone, id, interests));
+                    done = true;
+                }
+            } catch (Exception exception) {
+                System.out.println("Unexpected error happened!");
+            }
+        }
+        scanner.close();
+    }
+
+    public static String normalizeName(String name) {
+        return name.substring(0, 1).toUpperCase() + name.substring(1).toLowerCase();
+    }
+
+    public static String fullName(String firstName, String lastName) {
+        if (firstName.isBlank()) {
+            throw new Error("firstName is Empty!");
+        }
+        if (lastName.isBlank()) {
+            throw new Error("lastName is Empty!");
+        }
+        firstName = normalizeName(firstName);
+        lastName = normalizeName(lastName);
+        return firstName + " " + lastName;
+    }
+
+    public static String phoneNumber(String phone) {
+        switch (phone.length()) {
+            case 10:
+                if (phone.charAt(0) != '9') {
+                    throw new Error("invalid phone number! (enter phone number like 09xxxxxxxxx or 9xxxxxxxxx)");
+                }
+                phone = "0" + phone;
+                break;
+            case 11:
+                if (phone.charAt(0) != '0' || phone.charAt(1) != '9') {
+                    throw new Error("invalid phone number! (enter phone number like 09xxxxxxxxx or 9xxxxxxxxx)");
+                }
+                break;
+            default:
+                throw new Error("invalid phone number! (phone number length should be 10 or 11)");
+        }
+        for (char i : phone.toCharArray()) {
+            if (i < '0' || i > '9') {
+                throw new Error("invalid phone number! (phone number should only contains numbers)");
+            }
+        }
+        return phone;
+    }
+
+    public static String userId(String id) {
+        if (id.length() < 4 || id.length() > 13) {
+            throw new Error("id is not valid! (id length should be between 4 and 13)");
+        }
+        for (char i : id.toCharArray()) {
+            if (i < '0' || i > '9') {
+                throw new Error("id is not valid! (id should only contains numbers)");
+            }
+        }
+        return id;
+    }
+
+    public static String arrayToString(String[] array) {
+        StringBuilder arrayString = new StringBuilder();
+        for (int i = 0; i < array.length; i++) {
+            arrayString.append(i + 1);
+            arrayString.append(". ");
+            arrayString.append(array[i]);
+            if (i != array.length - 1) arrayString.append("\n");
+        }
+        return arrayString.toString();
+    }
+
+    public static String[] getInterests(int number) {
+        if (number < 1) {
+            throw new Error("Unexpected error!");
+        }
+        String[] interests = new String[number];
+        Scanner scanner = new Scanner(System.in);
+        int i;
+        for (i = 0; i < 10; i++) {
+            String nextLine = scanner.nextLine();
+            if (nextLine.isBlank()) break;
+            interests[i] = nextLine;
+        }
+        return Arrays.copyOf(interests, i);
+    }
+
+    public static String informationEncoder(String information, int shift) {
+        char[] encodedInformation = new char[information.length()];
+        char[] informationChars = information.toCharArray();
+        for (int i = 0; i < informationChars.length; i++) {
+            if (informationChars[i] >= 'a' && informationChars[i] <= 'z') {
+                encodedInformation[i] = (char) (((informationChars[i] + shift - 'a') + 26) % 26 + 'a');
+            } else if (informationChars[i] >= 'A' && informationChars[i] <= 'Z') {
+                encodedInformation[i] = (char) (((informationChars[i] + shift - 'A') + 26) % 26 + 'A');
+            } else if (informationChars[i] >= '0' && informationChars[i] <= '9') {
+                encodedInformation[i] = (char) (((informationChars[i] + shift - '0') + 10) % 10 + '0');
+            } else {
+                encodedInformation[i] = informationChars[i];
+            }
+        }
+        return new String(encodedInformation);
+    }
+
+    public static String informationDecoder(String information, int shift) {
+        return informationEncoder(information, -shift);
+    }
+
+    public static String userFullInformation(String fullname, String phonenumber, String userid, String[] interests) {
+        String intererestsString = (interests.length != 0) ? " Here are some of my interests:\n" + arrayToString(interests) : "";
+        return "Hello! My name is " + fullname + ". My ID is " + userid + "." + intererestsString + "\n\nYou can reach me via my phone number " + phonenumber + ".";
+    }
+}