Write a CRC card and a class diagram for a proposed class called Counter. An object of this class will be used to count things, so it will record a count that is a nonnegative whole number. Include methods to set the counter to a given integer, to increase the count by 1, and to decrease the count by 1. Also include a method that returns the current count as an integer, a method toString that returns the current count as a string suitable for display on the screen, and a method that tests whether the current count is zero.
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