In java, please and thank you so much!!! Write a program called CaesarLite that

ID: 3715295 • Letter: I

Question

In java, please and thank you so much!!!

Write a program called CaesarLite that encodes a message using a Caesar cipher (httos:/len. wikipedia.org/wiki/Caesar cioher). The user should be prompted for the number of positions to shift (positive or negative) and a message to encode. For example, a shift of 3 would map A to D and Bto E. You can assume that only capital letters need to be shifted and that other characters will not be changed. For this version, you can assume that the shift never goes past the beginning or end of the alphabet. Example 1: Enter shift:4 Enter message: HELLO Encoded message: LIPPS Example 2 Enter shift: -1 Enter message: IBM 9000 Encoded message: HAL 9000 Problem 2 Write a program called Caesar that encobes messages using an improved Caesar cipher. As in the previous problem, the user should be prompted for the number of positions to shift and a message to encode. For this version, however, shifting beyond the end (or beginning) of the alphabet wraps around to the beginning (or end). For example, a shift of 3 would map A to D, B to E, and Y to B. And a shift of -3 would map A to x, B to Y, and Y to V. You can assume that only capital letters need to be shifted and that other characters will not be changed. Example 1: Enter shift: 4 Enter message: HELLO WORLD Encoded message: LIPPs ASVPH Example 2: Enter shift: -1 Enter message: IBM 9000 Encoded message: HAL 9000

Explanation / Answer

CeasarLite.Java

import java.util.Scanner;

public class CeasarLite {

private static String alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

private String message = null;

private int shift=Integer.MAX_VALUE;

/**

* @return the message

public String getMessage() {

return message;

}

/**

* @param message the message to set

public void setMessage(String message) {

this.message = message;

}

/**

* @return the shift

public int getShift() {

return shift;

}

/**

* @param shift the shift to set

public void setShift(int shift) {

this.shift = shift;

}

/* returns the encoded message*/

public String getEncodedMsg(){

String cipherText ="";

if(message==null || shift == Integer.MAX_VALUE){

return null;

}

for(int i=0;i<message.length();i++){//interacting over the characters in message

char char1 = message.charAt(i);

int charPos = alphabets.indexOf(char1);//finding whether the same is an uppercase alphabet

if(charPos==-1){

cipherText+=char1;//if yes then just add without encode

}else{

charPos+=shift;//cipher character position = original position in alphabets + shift

if(charPos>=0 && charPos<alphabets.length()){//condition to skip for when position beyond alphabets postion range

cipherText+=alphabets.substring(charPos, charPos+1);//encode the message character

}

return cipherText;

}

public static void main(String[] args) {

//accept inputs and encode the message

CeasarLite object = new CeasarLite();

Scanner scanner = new Scanner(System.in);

System.out.println("Enter the shift:");

object.setShift(Integer.parseInt(scanner.nextLine()));

System.out.println("Enter the message:");

object.setMessage(scanner.nextLine());

System.out.println("Encoded message:"+object.getEncodedMsg());

}

OUTPUT

Enter the shift:
4
Enter the message:
HELLO
Encoded message:LIPPS

Enter the shift:
-1
Enter the message:
IBM 9000
Encoded message:HAL 9000

package apr242018;