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BJP5 Exercise 10.18: mirror

Language/Type: Java ArrayList Collections
Author: Marty Stepp (on 2019/09/19)

Write a method mirror that accepts an ArrayList of Strings as a parameter and produces a mirrored copy of the list as output, with the original values followed by those same values in the opposite order. For example, if an ArrayList variable called list contains the values ["a", "b", "c"], after a call of mirror(list); it should contain ["a", "b", "c", "c", "b", "a"].

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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