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Huh? You can, but the sort method already takes a Comparator class. If it took a function you could pass around the function instead.

Anyway, the point was only that "(sort list #'string-lessp)" is nothing special.

The definition of Comparator-interface includes only two methods, .compare and .equals. The documentations says that it is always safe to not override .equals, so we're left with just .compare. This effectively means that each comparator is effectively a function of two arguments that returns a boolean. Had functions been in Java in the first place, the whole Comparator interface would have been superfluous.

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