question: public static final void toString ( StringBuffer output , String str ) { if ( str == null ) { output . append ( "null" ) ; return ; } output . append ( toString ( str ) ) ; }
target:  Provides a Java string literal representing the parameter string. This includes surrounding double quotes, and quoted special characters, including UTF escape sequences when necessary. <p> This function works only for ASCII character encoding, and assumes this is the default encoding.