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Write a complete java method that returns an integer. the method declares a scanner object, then prompts the user for a series of integers in a while loop. if the user enters an integer (not a string, double, etc) then read each value entered and keep a running total (a sum). make sure to validate that the user enters only integers. include a sentinel value (-1) to allow the user to indicate when they are done. the method returns the total.

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