code: static int binarySearch(final short[] a, final int fromIndex, final int toIndex, final short key) {
          if (N.isNullOrEmpty(a)) {
              return N.INDEX_NOT_FOUND;
          }
  
          return Arrays.binarySearch(a, fromIndex, toIndex, key);
      }
docs: {@link Arrays#binarySearch(short[], int, int, short)}
  
  @param a
  @param fromIndex
  @param toIndex
  @param key
  @return