Need help in writing a program which is a java calculator. Use only procedural constructs of the Java programming language. You may use all the following: - the Main class since, - Scanner class with all its methods for input and output, - Array and String classes with all their methods Must do conversions: Binary to hexadecimal and vice versa Arithmetic to binary and vice versa Arithmetic to hexadecimal and vice versa Please use IntelliJ idea or eclipse. I have the code already done for: Binary to decimal Decimal to binary Hexadecimal to decimal Decimal to hexadecimal Please use this and add it to your code to print out the calculator values: public static void main(String[] args) {         //String binary = toBinaryString(number);         Scanner input = new Scanner(System.in);         System.out.println("Number Conversion in java \n");         // Display the menu         System.out.println("1.\t Decimal to Binary");         System.out.println("2.\t Decimal to Hexadecimal");         System.out.println("3.\t Binary to Decimal");         System.out.println("4.\t Hexadecimal to Decimal \n");         System.out.println("Your choice?");         //Get user's choice         int choice = -1;         while (choice < 0 || choice > 4) {             choice = input.nextInt();             switch (choice) {             case1:                 System.out.println("\nEnter Decimal Number");             break;             case2:                 System.out.println("\nEnter Decimal Number");             break;             case3:                 System.out.println("\nEnter Binary");             break;             case4:                 System.out.println("\nEnter Hexadecimal");             break;             default:                 System.out.println("\nInvalid choice. Please choose a number between 1 and 4.");                 break;             }         }         if (choice == 1) {             int number = input.nextInt();             String binary = toBinaryString(number);             binary = recursive(number);             System.out.printf("Decimal to Binary (%d) = %s", number, binary);         }         else if (choice == 2) {             int number2 = input.nextInt();             String hexadecimal = toHexString(number2);             hexadecimal = recursiveDecHex(number2);             System.out.printf("Decimal to Hexadecimal (%d) = %s ", number2, hexadecimal);         }         else if (choice == 3 ) {             String binary2 = input.next();             int decimal = toDecimalUsingParseInt(binary2);             decimal = recursiveBin(binary2);             System.out.printf("\n2. Binary to decimal - recursive(%s) = %d ", binary2, decimal);                      } else {             String hex = input.next();             int decimal = toHexUsingParseInt(hex);             decimal = recursiveHexDec(hex);             System.out.printf("Hexadecimal to Decimal (%s) = %d ", hex, decimal);         }         input.close();     }     private static String toBinaryString(int number) {         return Integer.toBinaryString(number);     }     private static String toHexString(int number) {         return Integer.toHexString(number);     }     private static int toDecimalUsingParseInt(String binaryNumber) {         return Integer.parseInt(binaryNumber, 2);     }     private static int toHexUsingParseInt(String number) {         return Integer.parseInt(number, 16);     }     private static String recursive(int number) {         StringBuilder builder = new StringBuilder();         if (number > 0) {             String binaryNumber = recursive(number / 2);             int digit = number % 2;             builder.append(binaryNumber + digit);         }         return builder.toString();     }     private static String recursiveDecHex(int number) {         StringBuilder builder = new StringBuilder();         if (number > 0) {             String hexNumber = recursiveDecHex(number / 16);             String hexCode = "0123456789ABCDEF";             int hexDigit = number % 16;             builder.append(hexNumber + hexCode.charAt(hexDigit));         }         return builder.toString();     }     private static int recursiveBin(String binaryNumber) {         int decimal = 0;         int length = binaryNumber.length();         if (length > 0) {             String substring = binaryNumber.substring(1);             int digit = Character.getNumericValue(binaryNumber.charAt(0));             decimal = digit * (int) Math.pow(2, length - 1) + recursiveBin(substring);         }         return decimal;     }     private static int recursiveHexDec(String hexNumber) {         int decimal = 0;         String hexCode = "0123456789ABCDEF";         hexNumber = hexNumber.toUpperCase();         int length = hexNumber.length();         if (length > 0) {             char ch = hexNumber.charAt(0);             int digit = hexCode.indexOf(ch);             String substring = hexNumber.substring(1);             decimal = digit * (int) Math.pow(16, length - 1) + recursiveHexDec(substring);         }         return decimal;     } }