CipherDriver.javapackage Unit_6;import java.util.;public cl.pdf

CipherDriver.java
//package Unit_6;
import java.util.*;
public class CipherDriver {
public static void main(String[] args) {
int menu1, menu2;
Scanner input = new Scanner(System.in);
System.out.println("Enter (1) to encode a message");
System.out.println(" Enter (2) to decode a message");
System.out.println(" Enter (3) to exit");
menu1 = input.nextInt();
if (menu1 == 3){
System.exit(0);
}
if (menu1 == 1 ){
int n;
System.out.println(" Enter (1) for substitution cipher");
System.out.println(" Enter (2) for shuffle cipher");
System.out.print(" Enter text to be encoded: ");
Scanner encodeText = new Scanner(System.in);
String encode_text = encodeText.nextLine();
if (menu2 == 3)
System.exit(0);
if (menu2 == 1){
System.out.print(" Enter shift value: ");
n = input.nextInt();
input.nextLine();
SubstitutionCipher sub = new SubstitutionCipher(n);
String encodedMessage = sub.encode(encode_text);

System.out.println("Encode Message: " + encodedMessage);
}
if (menu2 == 2){
System.out.print("Enter number of shuffles: ");
input.nextLine();
ShuffleCipher shuffleCipher = new ShuffleCipher(n);
String encodedText = shuffleCipher.encode(encode_text);
System.out.println("Encode Message: " + encodedText);
}
encodeText.close();
}
if (menu1 == 2){
int n;
System.out.print("Enter text to be decode: ");
Scanner decodeText = new Scanner(System.in);
String decode_text = decodeText.nextLine();
if (menu2 == 3)
System.exit(0);
if (menu2 == 1){
System.out.print("Enter shift value: ");
input.nextLine();
SubstitutionCipher substitution = new SubstitutionCipher(n);
String decodedText = substitution.decode(decode_text);
System.out.println("Decoded Message: " + decodedText);
}
if (menu2 == 2){

input.nextLine();
String decodedText = shuffleCipher.decode(decode_text);
}
decodeText.close();
}
input.close();
}
}
ShuffleCipher.java
//package Unit_6;
// Create a class ShuffleCipher that implements the interface MessageEncoder
public class ShuffleCipher implements MessageEncoder, MessageDecoder {
// The constructor should have one parameter called n
private int n;
// The constructor which takes the shuffle value
public ShuffleCipher (int n){
this.n = n;
}
// Performs single shuffle
private String shuffle(String text){
int splitLetter;
if (text.length() % 2 == 0)
splitLetter = text.length() / 2;
else
splitLetter = ((text.length() + 1) / 2);
String first = text.substring(0, splitLetter);
String second = text.substring(splitLetter);
String shuffleText = "";
for(int i = 0, j = 0; i < first.length(); i++, j++){
shuffleText += first.charAt(i);
if(j < second.length())

shuffleText += second.charAt(i);
}
return shuffleText;
}
// Decodes the shuffled message
private String decodeShuffle(String text){
String firstHalf = "", secondHalf = "";
for(int i=0;i
Solution
CipherDriver.java
//package Unit_6;
import java.util.*;
public class CipherDriver {
public static void main(String[] args) {
int menu1, menu2;
Scanner input = new Scanner(System.in);
System.out.println("Enter (1) to encode a message");
System.out.println(" Enter (2) to decode a message");
if (menu1 == 3){
System.exit(0);
}
if (menu1 == 1 ){
int n;
System.out.print(" Enter text to be encoded: ");
Scanner encodeText = new Scanner(System.in);
String encode_text = encodeText.nextLine();

if (menu2 == 3)
System.exit(0);
if (menu2 == 1){
System.out.print(" Enter shift value: ");
input.nextLine();
SubstitutionCipher sub = new SubstitutionCipher(n);
String encodedMessage = sub.encode(encode_text);
System.out.println("Encode Message: " + encodedMessage);
}
if (menu2 == 2){
input.nextLine();
String encodedText = shuffleCipher.encode(encode_text);
System.out.println("Encode Message: " + encodedText);
}
encodeText.close();
}
if (menu1 == 2){
int n;
System.out.print("Enter text to be decode: ");
Scanner decodeText = new Scanner(System.in);
String decode_text = decodeText.nextLine();
if (menu2 == 3)
System.exit(0);
if (menu2 == 1){

System.out.print("Enter shift value: ");
input.nextLine();
SubstitutionCipher substitution = new SubstitutionCipher(n);
String decodedText = substitution.decode(decode_text);
}
if (menu2 == 2){
input.nextLine();
String decodedText = shuffleCipher.decode(decode_text);
}
decodeText.close();
}
input.close();
}
}
ShuffleCipher.java
//package Unit_6;
// Create a class ShuffleCipher that implements the interface MessageEncoder
public class ShuffleCipher implements MessageEncoder, MessageDecoder {
// The constructor should have one parameter called n
private int n;
// The constructor which takes the shuffle value
public ShuffleCipher (int n){
this.n = n;
}
// Performs single shuffle
private String shuffle(String text){
int splitLetter;
if (text.length() % 2 == 0)
splitLetter = text.length() / 2;

else
splitLetter = ((text.length() + 1) / 2);
String first = text.substring(0, splitLetter);
String second = text.substring(splitLetter);
String shuffleText = "";
for(int i = 0, j = 0; i < first.length(); i++, j++){
shuffleText += first.charAt(i);
if(j < second.length())
shuffleText += second.charAt(i);
}
return shuffleText;
}
// Decodes the shuffled message
private String decodeShuffle(String text){
String firstHalf = "", secondHalf = "";
for(int i=0;i

CipherDriver.javapackage Unit_6;import java.util.;public cl.pdf

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CipherDriver.javapackage Unit_6;import java.util.;public cl.pdf