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try:

while (!bookTitle.equalsIgnoreCase("done"))

You can use the syntax Character.isDigit to determine if a character is a digit or not. Also, in your code, it's possible to exit with 'True' before checking the whole string (if the first character...

I'm having an issue with clearing a JList (which has been added to a JScrollPanel). When I click the "clear" button, it clears fine. But if I first click "print" and then try to click "clear", the...