Find the index of the first negative number

IntegerListUtils.java

import java.util.ArrayList;

public class IntegerListUtils {

/**
* Finds the index of the first negative number in the list.
*
* @param numbers a list of integers
* @return the index of the first negative number, or -1 if no negative number found
*/
public static int findIndexOfFirstNegative(ArrayList<Integer> numbers) {
// complete this method
}
}

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