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

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