Returns the index within this string of the last occurrence of
the specified character. For values of
ch in the
range from 0 to 0xFFFF (inclusive), the index (in Unicode code
units) returned is the largest value k such that:
is true. For other values ofthis.charAt(k) == ch
ch, it is the largest value k such that:
is true. In either case, if no such character occurs in this string, thenthis.codePointAt(k) == ch
-1is returned. The
Stringis searched backwards starting at the last character.
|a character (Unicode code point).|
-1 if the character does not occur.