Chapter 19, Problem 5E

Explanation of Solution

“countNegatives” method:

//definition of "countNegatives" method

public static void countNegatives (int [] a)

{

    //return the total number of negative numbers

    return Arrays.stream (a)

        //restrict the "n"

        .filter (n -> n < 0)

        //call the "map" method

        .map (n -> 1)

        //call the "reduce" method

        ...