I am having an issue with trying to make my code to have a
required output
////////////Input//////////
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0
//////////Output//////////
Required Output
Enter some text to encrypt\n
Enter a key\n
Error: Key is divisible by 26. That's a bad key!\n
Useless key: 0\n
///////////Cipher.java///////// ------------ My code.
public class Cipher
{
    private String plainText;
    private int key;
    public Cipher(String text, int key) throws EmptyPlainText, UselessKeyException
    {
        if (text == null || text.length()...