Java: Date class dates and calendar

How to get system system time through Java?

Date now=   new  date (); SimpleDateFormat DateFormat=new simpledateformat ("Yyyy-mm-dd HH:mm:ss. Sssssssss "); String nowformate=   Dateformat.format (now); System.out.println (nowformate);

Output results

2017-02-16 20:56:12.000000278

How to get the current system is the week?

Method One,

    String weekofday= Getweekofday (now);    System.out.println (weekofday);      Public Static String getweekofday (date date) {        string[] weekdays=new string[]{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday" , "Friday", "Saturday"};        Calendar Calendar= calendar.getinstance ();        Calendar.settime (date);        int weekindex= calendar.get (Calendar.day_of_week)-1;         if (weekindex<0)            weekindex=0;         return Weekdays[weekindex];    }

Method Two,

        SimpleDateFormat   dateformat2=new SimpleDateFormat ("eeee");        String nowFormate2=   Dateformat2.format (now);        System.out.println (NOWFORMATE2);

Calendar gets the year, month, day of the current system date

        Calendar calendar= calendar.getinstance ();        Calendar.settime (now);         int year= calendar.get (calendar.year);         int month= calendar.get (calendar.month) +1;         int day= calendar.get (calendar.day_of_month);        System.out.println (year + "-" +month+ "-" +day ");

Java: Date class dates and calendar