public void fill(int fromIndex, int toIndex, char value) {
if (fromIndex < 0 || toIndex < fromIndex || start + toIndex > end)
throw new IndexOutOfBoundsException();
((CharSeq) base).fill(start + fromIndex, start + toIndex, value);
}
/** Set all the elements to a given character. */
public void fill(char value) {
((CharSeq) base).fill(start, end, value);
}