Working with elements of an array

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Implement the main(String[]) method so that it reverses the sign of an element of the array if the element is even.
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Level 12 , Earth, Germany
12 August 2022, 14:39
Even if the concept is easy to understand, this exercise was not too easy, without having seen the syntax before. Isn't there any better way, to go through the indices? Maybe something like
array[i] = array[i] * (-1);
? Of course this won't work 1:1, but you understood my thought here.