EASY JAVA 02 Alternating sum of array elements class exercise

Anothery easy java exercise from the book. Goal is to provide an alternating sum of array elements. For example if it was 1 2 3, then result should be 1 + 2 - 3 = 0. We will create a class and provide few methods to work with array of integers.
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[bluereino]

How do you make it where the user inputs the array using Scanner Class?