How to get the current date time in Java

Calendar cal = Calendar.getinstance ();
Java.text.SimpleDateFormat SDF = new SimpleDateFormat ("yyyy");
String CDate = Sdf.format (Cal.gettime ());

1. Use Java.util.Calendar
Calendar CA = Calendar.getinstance ();
Date now = Ca.gettime ();
Ca.add (Calendar.day_of_month, 7);
Date fu = ca.gettime ();
Fu is the date after 7 days
2. In addition, the current time is obtained with the new date (), but it does not seem to be advocated with the date type new Java.util.Date ()

A small program that displays the system date:

Due to the original procedure (reproduced in 2009-9-8) a little problem, so slightly modified (2009-12-2):

Import java.awt.*;
Import java. applet.*;
Import java.util.*;

public class Showtimeapplet extends applet{
GregorianCalendar calendar=new GregorianCalendar ();
Take out the current year, month, day
int Year=calendar.get (Calendar. year);

Month value plus 1 to make it a custom month size (January-December)
int Month=calendar.get (Calendar. MONTH) +1;
int Today=calendar.get (Calendar. Day_of_month);

Output the current year, month, day and week format sample
System.out.println ("Today is" +year+ "/" +month+ "/" +today+ "!");
System.out.println ();
System.out.println ("Sun Mon Tue Wed Thu Fri Sat"); Two spaces in the middle

Set to display the calendar from the current month of 1th and see if he is the day of the one week
Calendar.set (Calendar. day_of_month,1);
int Weekday=calendar.get (Calendar. Day_of_week);

Align number 1th to the appropriate week
for (int I=calendar. Sunday;i < weekday;i++)
System.out.print (""); 5 spaces in the middle
int day,month;
Use the Do-while loop to achieve the output of the calendar
do{
Day=calendar.get (Calendar. Day_of_month);
System.out.print (day);

Date is today more output a "*" for identification, date is not today judged whether it is less than 10, output a certain space. This is primarily to align the format.

if (day==today)
{
System.out.print ("*");
if (day<10) System.out.print (""); 2 spaces in the middle
}
else if (day<10) System.out.print (""); 3 spaces in the middle
else System.out.print (""); 2 spaces in the middle
Weekday=calendar.get (Calendar. Day_of_week);

According to the format requirements, Saturday to wrap. If you do not wrap, a certain space is output
if (Weekday==calendar. SATURDAY) System.out.println ();
else System.out.print ("");

Calendar.add (Calendar. day_of_week,1);
Month=calendar.get (Calendar. MONTH) +1;
} while (Month==month); If month exceeds the current month, exit the loop,
System.out.println ();
System.out.println ();

}

Reprinted from Http://blog.csdn.net/quxiuer/archive/2008/09/24/2972773.aspx

How to get the current date time in Java