final public MutableString toLowerCase(){
  int n=length();
  final char[] a=array;
  while (n-- != 0)   a[n]=Character.toLowerCase(a[n]);
  changed();
  return this;
}

final public MutableString toLowerCase ( ) { int n = length ( ) ; final char [ ] a = array ; while ( n -- != 0 ) a [ n ] = Character . toLowerCase ( a [ n ] ) ; changed ( ) ; return this ; }
converts all of the characters in this mutable string to lower case using the rules of the default locale .
