an encryption program using Caesar Cipher
<p>I need to do a java homework, which is Caesar encryption uses a simple substitution cipher. It choose how many letters to shift the alphabet by, and substitute letters appropriately.</p>

<p>for example move 3,</p>

<p>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</p>

<p>Shift by 3: D E F G H I J K L M N O P Q R S T U V W X Y Z A B C</p>

<p>sentence original: MY NAME IS JOHN</p>

<p>after encrypted  : PB QDPH LV MRKQ</p>

<p>The program allow the user to enter an input file name and an output file name then saves the encrypted version of the input file to the output file.
Then also need a program to decode the encrypted file. Which also can let the user to enter an input file name and an output file name and save the unencrypted version of the input file to the output file.</p>

<ul>
<li>I just know want to use looping, case selection but do not know the coding. Like how to switch it, the space how to skip and continue. I just need the simple 1, and only capital letter.</li>
</ul>

<p>thanks!</p>
