Write a program Caesar.java to perform a specific kind of encryption and decryption.

In the classical Caesar cipher, each letter in the original text (also known as the cleartext) is replaced by a letter a certain number of letters down the alphabet to give the encrypted text (ciphertext). We will be using a Caesar cipher that substitutes each letter with the letter 13 positions down the alphabet, a scheme known as Rot13 (short for \"rotate\" 13 positions). In Rot13, an A in the cleartext becomes an N in the ciphertext, a B becomes an O, a C becomes a P, a D becomes a Q, and so on, according to the following table:

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

N O P Q R S T U V W X Y Z A B C D E F G H I J K L M

The nice thing about using 13 positions is that the same rot13 operation can be used for encrypting as for decrypting: HELLO WORLD encrypts to URYYB JBEYQ, and encrypting again gives back HELLO WORLD.

Specifically, your program must:

• have a rot13 method which uses a large switch statement to convert each of the uppercase alphabetic characters to its rot13 equivalent (returning unchanged any non-uppercase or non-alphabetic character).
• repeatedly request user input
• convert the input to upper case: if your input is in variable line, the expression line.toUpperCase() returns the upper case version of the line
• if the user input, after conversion to uppercase, is the string \"DONE\", exit the program.
• otherwise, call your rot13 method for each character in the string, and print it

Here is an example interaction

enter the cleartext: yes

the ciphertext is: LRF

enter the cleartext: ICS

the ciphertext is: VPF

enter the cleartext: Uryyb Jbeyq

the ciphertext is: HELLO WORLD

enter the cleartext: Done

Code I have so far:

importjava.util.Scanner;

publicclassCaesar {

publicstaticcharrot13(charc) {

switch(c) {

case'A' :return'N';

case'B' :return'O';

case'C' :return'P';

default:returnc;

}

}

publicstaticvoidmain(String[] args) {

Scanner in =newScanner(System.in);

System.out.println(\"Enter\");

String input = in.nextLine();

String trueinput = input.toUpperCase();

for(inti = 0; i

System.out.print(rot13(trueinput.charAt(i)));

}

}

}