Update AssessmentPartThree.java

src/AssessmentPartThree.java

-
-public class AssessmentPartThree {
-
-	// The simplest form of encryption is the rotation cipher (also known as Caeser's Cipher)
-	// An offset value is chosen to encrypt a message. Each letter is replaced by the
-	// letter that that number of places away from it.
-	// So if an offset value of 1 is chosen, each letter is replaced by the one after it
-	// - so a becomes b, b becomes c, etc
-	// If a value of -2 is chosen a becomes y, b becomes z and so on
-	
-	 public char enryptedCharacter(char theChar, int theOffset)
-	 {
-		 // 05 - encryptedCharacter
-		 // Complete this method so that it returns the encrypted character for
-		 // theChar when and offset of theOffset is used
-		 // So if theChar='m' and theOffset is 3 the method will return 'p'
-		 // Lower case characters remain lower case, upper case remain upper case
-		 // Any other characters are returned unchanged
-		 
-		 return 'a';
-	 }
-	 
-	 public String encryptedString(String theMessage, int theOffset)
-	 {
-		 // 06 - encryptedMessage
-		 // Complete this method so that it uses encryptedCharacter to 
-		 // return the encrypted version of theMessage using theOffset
-		 
-		 return "Encryptred message";
-	 }
-	
- }
+public class AssessmentPartThree {
+
+	// The simplest form of encryption is the rotation cipher (also known as Caeser's Cipher)
+	// An offset value is chosen to encrypt a message. Each letter is replaced by the
+	// letter that that number of places away from it.
+	// So if an offset value of 1 is chosen, each letter is replaced by the one after it
+	// - so a becomes b, b becomes c, etc
+	// If a value of -2 is chosen a becomes y, b becomes z and so on
+	
+	 public char enryptedCharacter(char theChar, int theOffset)
+	 {
+		 // 05 - encryptedCharacter
+		 // Complete this method so that it returns the encrypted character for
+		 // theChar when and offset of theOffset is used
+		 // So if theChar='m' and theOffset is 3 the method will return 'p'
+		 // Lower case characters remain lower case, upper case remain upper case
+		 // Any other characters are returned unchanged
+		 
+		 char[] alphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; // creates an array which has each letter of the alphabet
+	 int letterPlace = 0; //creates an int and the value is 0
+	 
+	 theChar = Character.toLowerCase(theChar); //makes theChar equal to the lowercase value of theChar
+	 boolean upperCase = Character.isUpperCase(theChar); // makes it equal to the uppercase value of theChar
+	
+	 if (Character.isLetter(theChar))
+	 {
+		 if (theOffset < 0) 
+		 {
+			 theOffset = theOffset + 26; 
+		 }
+		 if (theOffset > alphabet.length) // if the value of theOfset is greater than  the length of the string alphabet 
+		 {
+			 theOffset = theOffset - 26;
+		 }
+		 else 
+		 {
+			 theChar = alphabet[theOffset];
+		 }
+	 }
+	 else
+	 {
+		 return theChar; 
+	 }
+	 for (int i = 0 ; i < alphabet.length; i++) // creates a 'for' loop that runs as long as 'i' is less than the length of the array string alphabet
+	 {
+		 if (theChar == alphabet[i]) 
+		 {
+			 theOffset = theOffset + i; 
+		 }
+	 } 	 
+ 
+ if (upperCase) 
+ {
+	 theChar = Character.toUpperCase(theChar); //makes thechar equal to the uppercase value of thechar
+ }
+ return theChar;
+	 }
+	 
+	 public String encryptedString(String theMessage, int theOffset)
+	 {
+		
+		         // 06 - encryptedMessage
+		         // Complete this method so that it uses encryptedCharacter to 
+		         // return the encrypted version of theMessage using theOffset	
+		 
+		String output = "";
+		
+		for (char letter : theMessage.toCharArray()) //creates a 'for' loop that iterates the char "letter" through theMessage.tochararray 
+		{
+			output = output + letter; 
+			
+			
+			letter = enryptedCharacter( letter, theOffset); // makes letter equal to the amount which has been obtained while running theMessgae through the encrypted character method above
+	
+		}
+		 
+		 return output; 
+	 }
+}