return sum of all items of the array passed that lie in the number range low or high

Question

Trying to understand this question a bit more. Currently I need to return the sum of all the values that lie with a range either low or high within an array. Currently I have got this far (see code below), however I am stuck on what to do next. Any help?

public static int sumrange(int[] data, int low, int high) {
    int sum = 0; 
    if (data == null || data.length == 0) {
           return 0;
    }

    for (int i = 0; i < data.length;) {
        if (i < low) {
            sum = sum + data[i];
            return sum;
        }else if (i > high)
            sum = sum + data[i];
            return sum;         
    }   
    return 0; 
}