get closest value to a number in array

Question

I have an array of positive/negative ints

int[] numbers = new int[10];
numbers[0] = 100;
numbers[1] = -34200;
numbers[2] = 3040;
numbers[3] = 400433;
numbers         


        

Answer 1

One statement block to initialize and set the closest match. Also, return -1 if no closest match is found (empty array).

 protected int getClosestIndex(final int[] values, int value) {
    class Closest {
        Integer dif;
        int index = -1;
    };
    Closest closest = new Closest();
    for (int i = 0; i < values.length; ++i) {
        final int dif = Math.abs(value - values[i]);
        if (closest.dif == null || dif < closest.dif) {
            closest.index = i;
            closest.dif = dif;
        }
    }
    return closest.index;
}