Could use some assistance on this Java exercise. Loops have proven to be quite challenging for me so any clarity on how/steps to complete this problem would be seriously appreciated. 2. Set up a class named `MyCipher`. The class will have an integer variable named `key`. It also has the following methods: - A constructor initializing `key` with 0. - A method named `setKey(int k)` that takes a positive integer and puts it into `key`. - A method named `encode(String p)` that takes a plain text `p` and encodes it to a cipher text by adding the key value to each alphabet character of plain text `p`. For example, if `p = "attack at dawn"` and `key` is 5, it should be encrypted as "fyyfhp fYifas" because `a+5 = 'f'`, `t+5 = 'y'`, `c+5 = 'h'`, `k+5 = 'p'`, `' '+5 = 'e'`, `d+5 = 'i'`, `w+5 = 'a'`, and `n+5 = 's'`. - A method named `decode(String c)` that takes a cipher text `c` and decodes it to a plain text by subtracting the key value from each alphabet character of `c`.3. Assume that the only characters allowed in both plain text and cipher text are lower-case alphabet letters and blanks.4. Provide steps in the main method to test each method of `MyCipher` class by including the following steps: - Read a key; - Read a plain text and print the encoded cipher text; - Read a cipher text and print the decoded plain text.

Here is the approach : Create the class called MyCipher. Create the var key. Use the constructor…

Answered: 2. Set up a class named MyCipher. The…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Could use some assistance on this Java exercise. Loops have proven to be quite challenging for me so any clarity on how/steps to complete this problem would be seriously appreciated.

2. Set up a class named `MyCipher`. The class will have an integer variable named `key`. It also has the following methods:
- A constructor initializing `key` with 0.
- A method named `setKey(int k)` that takes a positive integer and puts it into `key`.
- A method named `encode(String p)` that takes a plain text `p` and encodes it to a cipher text by adding the key value to each alphabet character of plain text `p`. For example, if `p = "attack at dawn"` and `key` is 5, it should be encrypted as "fyyfhp fYifas" because `a+5 = 'f'`, `t+5 = 'y'`, `c+5 = 'h'`, `k+5 = 'p'`, `' '+5 = 'e'`, `d+5 = 'i'`, `w+5 = 'a'`, and `n+5 = 's'`.
- A method named `decode(String c)` that takes a cipher text `c` and decodes it to a plain text by subtracting the key value from each alphabet character of `c`.

3. Assume that the only characters allowed in both plain text and cipher text are lower-case alphabet letters and blanks.

4. Provide steps in the main method to test each method of `MyCipher` class by including the following steps:
- Read a key;
- Read a plain text and print the encoded cipher text;
- Read a cipher text and print the decoded plain text.

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Explanation

Here is the approach :

Create the class called MyCipher. Create the var key.
Use the constructor to intialize the key of the class.
Create the method called encode.
For the encoding iterate over the string one by one . Convert the character to ASCII value . After getting the ASCII value for the character check if the character is lowercase or not . If the character is lowercase then add the value of key in the character ASCII and add the char in the encoded string .
If after adding the 5 the character surpasses the z then start again from a .
Similarly do for the decode subtract the key value from the ASCII value of the character. During the decode also take care of the character ASCII value getting smaller than a . In such case again start from z and go back .
Check code for more understanding everything is mentioned in the comments . Screenshots are also added .

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