question: public static String toUpperCase ( String s , Locale locale ) { if ( s == null ) { return null ; } StringBuilder sb = null ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { char c = s . charAt ( i ) ; if ( c > 127 ) { if ( locale == null ) { locale = Locale . getDefault ( ) ; } return s . toUpperCase ( locale ) ; } if ( ( c >= 'a' ) && ( c <= 'z' ) ) { if ( sb == null ) { sb = new StringBuilder ( s ) ; } sb . setCharAt ( i , ( char ) ( c - 32 ) ) ; } } if ( sb == null ) { return s ; } return sb . toString ( ) ; }
target:  Converts all of the characters in the string to upper case, based on the locale.