public class IndexForTwoArrays {

  public int compare(double[] a1, double[] a2) {
    if (a1 == a2) {
      return 0;
    }
    int len = Math.min(a1.length, a2.length);
    for (int i = 0; i < len; i++) {
      if (a1[i] != a2[i]) {
        return ((a1[i] > a2[i]) ? 1 : -1);
      }
    }
    return a1.length - a2.length;
  }
}