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Obviously it has revealed the flaw since they mentioned being confused by the results they are getting. A better solution would be to use a method that returns a boolean: false as soon as it finds a...

if (sentence.length()<26)

That if statement will handle empty Strings ie if user hits return without entering anything. Thus the check for an empty String is redundant.

To explain my point...

I think it is a bad design. One problem I can see is that a StringIndexOutOfBoundsException will occur if the sentence is longer than alphabet. If the issue mentioned above is fixed then it will...