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What is the null string?

A null string is an empty string. It is sometimes known as 'the null string'. It is not, as I have seen somebody do, a string containing the word "null".
NOTE: The Java section is mostly in maintenence mode. I don't have time to work on it right now. Errors will be corrected if pointed out, but they are not actively being searched for. Newer site features, like alternate stylesheets, may cause problems with these pages.