public static void fill(byte[] a, int fromIndex, int toIndex, byte val)
public static void fill(boolean[] a, boolean val)
  public static void fill(byte[] a, int fromIndex, int toIndex, byte val)  {    if (fromIndex > toIndex)      throw new IllegalArgumentException();    for (int i = fromIndex; i < toIndex; i++)      a[i] = val;  }