task done

Answers/Main/.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/Main/Main.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

Answers/Main/src/Main.java

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+import java.util.Scanner;
+import java.util.Objects;
+import javax.management.BadStringOperationException;
+
+public class Main{
+    static boolean F = true;
+    public static String fullName(String firstName, String lastName){
+        firstName = firstName.toLowerCase();
+        lastName = lastName.toLowerCase();
+        String[] name1 = firstName.split("");
+        String[] last1 = lastName.split("");
+        name1[0] = name1[0].toUpperCase();
+        last1[0] = last1[0].toUpperCase();
+        String res = "" ;
+        for(int i =0 ; i< name1.length ;i++)
+            res += name1[i];
+        res += " ";
+        for(int i =0 ; i< last1.length ;i++) {
+            res += last1[i];
+        }
+        return res.trim() ;
+    }
+    public static String phoneNumber(long  phone){
+        int count;
+        long n = phone;
+        for(count=0 ; n /10 != 0; count++)
+        {
+            n = n/10 ;
+        }
+        count ++;
+        if (count != 10){
+            F = true;
+            return "f" ;
+        }
+        int size;
+        String phone1 = String.valueOf(phone);
+        String[] phone2 = phone1.split("");
+        size = phone2.length;
+        if (phone2[0] != "9") {
+            String[] res = new String[size+1];
+            res[0]="0";
+            for (int i=0 ; i<phone2.length ;i++){
+                res[i+1] = phone2[i];
+            }
+            String result="";
+            for(int i =0 ; i< res.length ;i++) {
+                result += res[i];
+            }
+            F = false;
+            return result;
+        }
+        else{
+            F = true;
+            return "f" ;
+        }
+    }
+    public static String userId( long id){
+        int count;
+        long n = id;
+        for(count=0 ;n/10 != 0; count++)
+        {
+            n = n/10 ;
+        }
+        count++ ;
+        if (count < 4 || count >13){
+            F = true;
+            return "f" ;
+        }
+        String id1 = String.valueOf(id);
+        F = false;
+        return id1;
+    }
+    public static String getInterests(){
+        Scanner scan = new Scanner(System.in);
+        String[] interests = new String[11];
+        boolean flag = true;
+        int i =0 ;
+        System.out.println("If you want it to end, write \"finish\"");
+        while (flag && i<10){
+            System.out.println("enter your interest: ");
+            interests[i] =scan.nextLine();
+            if (Objects.equals(interests[i], "finish")){
+                flag =false;
+                continue;
+            }
+            i++;
+        }
+        String res="";
+        for (int j = 0; !Objects.equals(interests[j], "finish") && (j < 10); j++){
+            res = res + ((j+1) + ". " + interests[j]+"\n");
+        }
+        return res;
+    }
+    public static String userFullInformation(String fullName, String phoneNumber,String userID, String interests){
+        String res = "Hello! My name is "+fullName+"."+" My ID is "+userID+"."+" Here are some of my interests:"+"\n"+interests + "\n"+"You can reach me via my phone number "+phoneNumber;
+//        System.out.println("Hello! My name is "
+//                +fullName+"."+" My ID is "+userID+"."+" Here are some of my interests:");
+//        System.out.println(interests);
+//        System.out.println("You can reach me via my phone number "+phoneNumber);
+        return res;
+    }
+
+    public static void informationDecoder(String information, int shift){
+        char[] information1 = information.toCharArray();
+        char[] information2 = new char[information1.length];
+        int n;
+        for (int i=0 ; i< information1.length;i++){
+            n = information1[i] - shift;
+            if ((information1[i] >=65 && information1[i] <=90 ) && n<65){
+                information2[i] = (char) (91+n-65);
+            }
+            else if ((information1[i] >96 && information1[i] <123) && n <= 96){
+                information2[i] = (char) (122 +(n-96)) ;
+            }
+            else if ((information1[i] >96 && information1[i] <123) && ((n > 96 && n < 123))){  // tik
+                information2[i] = (char) n;
+
+            }
+            else if ((information1[i] >=65 && information1[i] <=90 ) && ((n>=65 && n <=90))) {
+                information2[i] = (char) n ;
+            }
+            else {
+                information2[i]  = information1[i];
+            }
+        }
+        for (int i=0 ; i < information2.length;i++){
+            System.out.print(information2[i]);
+        }
+    }
+
+    public static String informationEncoder( String information,int shift){
+        char[] information1 = information.toCharArray();
+        char[] information2 = new char[information1.length];
+        int n;
+        for (int i=0 ; i < information1.length ; i++){
+            n = information1[i] + shift;
+            if ((information1[i] >=65 && information1[i] <=90 ) && n > 90 ){
+                information2[i] = (char) (64 + (n-90));
+            }
+            else if((information1[i] >96 && information1[i] <123) && n >122){
+                information2[i] = (char) (96+(n-122));
+            }
+            else if ((information1[i] >=65 && information1[i] <=90 ) && (n>=65 && n<=90)){
+                information2[i] = (char) n ;
+            }
+            else if ((information1[i] >96 && information1[i] <123) && (n>96 && n<123)){
+                information2[i] = (char) n ;
+            }
+            else{
+                information2[i]  = information1[i];
+            }
+        }
+        String res="";
+        for (int i=0 ; i < information2.length;i++){
+            res += information2[i];
+            System.out.print(information2[i]);
+        }
+        return res;
+    }
+    public static void main (String[] args){
+        Scanner scan = new Scanner(System.in);
+        System.out.print("First name: ");
+        String firstName = scan.nextLine();
+        System.out.print("Last name: ");
+        String lastName = scan.nextLine();
+        String fullName = fullName(firstName , lastName);
+        String phoneNumber = new String();
+        String ID = new String();
+        while (F) {
+            System.out.print("Phone number (do not insert first zero) : 0");
+            long phone = scan.nextLong();
+            phoneNumber = phoneNumber(phone);
+        }
+        F =  true;
+        while (F) {
+            System.out.print("User ID: ");
+            long id = scan.nextLong();
+            ID = userId(id);
+        }
+        F = true;
+        String interests = getInterests();
+        String result = userFullInformation(fullName,phoneNumber,ID,interests);
+        System.out.println(result);
+        while (F){
+            int shift;
+            System.out.println("do you want to coding information? (y/n)");
+            String c = scan.next();
+            if (Objects.equals(c, "y")){
+                System.out.print("how many step you want to shift: ");
+                shift = scan.nextInt();
+                result=informationEncoder(result,shift);
+                System.out.println("\n");
+            }
+            else{
+                break;
+            }
+            System.out.println("do you want to decoding information? (y/n)");
+            c = scan.next();
+            if (Objects.equals(c, "y")){
+                informationDecoder(result,shift);
+            }
+            else {
+                break;
+            }
+        }
+    }
+}