CarFueling - my solution to a programming exercise

CarFueling.java

import java.util.*;
import java.io.*;

public class CarFueling {
    static int computeMinRefills(int dist, int tank, int[] stops) {
    	int numOfRefills = 0;
    	int currentIdx = 0;
    	int lastRefillIdx = 0;

    	while (currentIdx < stops.length - 1) {
    		lastRefillIdx = currentIdx;

    		while (currentIdx < stops.length && currentIdx + 1 < stops.length && stops[currentIdx + 1] - stops[lastRefillIdx] < tank) {
    			currentIdx = currentIdx + 1;
    		}

    		if (currentIdx == lastRefillIdx) {
    			return -1;
    		}

    		if (currentIdx < stops.length - 1) {
    			numOfRefills = numOfRefills + 1;
    		}
    	}

    	return numOfRefills;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int dist = scanner.nextInt();
        int tank = scanner.nextInt();
        int n = scanner.nextInt() + 2;
        int stops[] = new int[n];
        stops[0] = 0;
        for (int i = 1; i < n - 1; i++) {
            stops[i] = scanner.nextInt();
        }
        stops[n - 1] = dist;

        System.out.println(computeMinRefills(dist, tank, stops));
    }
}