java,Time和Date互相转换

        SimpleDateFormat  sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Long time=new Long(445555555);        String str = sdfTime.format(time);        try {            Date date = sdfTime.parse(str);// Long->String->Date            System.out.println(date); //Tue Jan 06 11:45:55 CST 1970        } catch (ParseException e) {            e.printStackTrace();        }        String dateStr = "1999-9-9 9:9:9";        try {            Date  dateDate = sdfTime.parse(dateStr);//String->Date->Long            System.out.println(dateDate.getTime());//936839349000        } catch (ParseException e) {            e.printStackTrace();        }