包含javaadddate的词条
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本文目录一览：
- 1、用java实现日期类的加减
- 2、java输入日期输出后一天
- 3、java中怎么把两个为Date类型的数据相加哦
- 4、java编程编写一个完成给日期增加指定天数功能的程序
- 5、java中Date对象的格式问题
- 6、java calendar的add和set方法的区别
用java实现日期类的加减
import java.util.Date;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.util.*;
public class CalendarExample {
private static void CalendarTimemethod() {
Date date = Calendar.getInstance().getTime();
System.out.println("Current date and time is: " + date);
System.out.println();
}
private static void SimpleDateFormatmethod() {
Calendar date = Calendar.getInstance();
SimpleDateFormat dateformatter = new SimpleDateFormat(
"E yyyy.MM.dd 'at' hh:mm:ss a zzz");
System.out.println("Current date and time in simple date format: "
+ dateformatter.format(date.getTime()));
System.out.println();
}
private static void Adddates() {
System.out.println("Performing operations on calendar dates.");
// Get today's date
Calendar date = Calendar.getInstance();
Calendar cldr;
SimpleDateFormat dateformatter = new SimpleDateFormat(
"E yyyy.MM.dd 'at' hh:mm:ss a zzz");
cldr = (Calendar) date.clone();
cldr.add(Calendar.DAY_OF_YEAR, -(365 * 2));
System.out.println("Before two years it was: "
+ dateformatter.format(cldr.getTime()));
cldr = (Calendar) date.clone();
cldr.add(Calendar.DAY_OF_YEAR, +5);
System.out.println("After five years it will be: "
+ dateformatter.format(cldr.getTime()));
System.out.println();
}
private static void DateDifference() {
System.out.println("Difference between two dates");
Date startDate1 = new GregorianCalendar(2005, 02,
25, 14, 00).getTime();
Date endDate1 = new Date();
;
long diff = endDate1.getTime() - startDate1.getTime();
System.out.println(" Difference between " + endDate1);
System.out.println(" and " + startDate1 + " is " + (diff /
(1000L * 60L * 60L * 24L)) + " days.");
System.out.println();
}
private static void Getcalendermethods() {
System.out.println("Various get methods of the calendar class:");
Calendar calender = Calendar.getInstance();
System.out.println("Year : "
+ calender.get(Calendar.YEAR));
System.out.println("Month : "
+ calender.get(Calendar.MONTH));
System.out.println("Day of Month : "
+ calender.get(Calendar.DAY_OF_MONTH));
System.out.println("Day of Week : "
+ calender.get(Calendar.DAY_OF_WEEK));
System.out.println("Day of Year : "
+ calender.get(Calendar.DAY_OF_YEAR));
System.out.println("Week of Year : "
+ calender.get(Calendar.WEEK_OF_YEAR));
System.out.println("Week of Month : "
+ calender.get(Calendar.WEEK_OF_MONTH));
System.out.println("Day of the Week in Month : "
+ calender.get(Calendar.DAY_OF_WEEK_IN_MONTH));
System.out.println("Hour : " + calender.get(Calendar.HOUR));
System.out.println("AM PM : " + calender.get(Calendar.AM_PM));
System.out.println("Hour of the Day : "
+ calender.get(Calendar.HOUR_OF_DAY));
System.out.println("Minute : " + calender.get(Calendar.MINUTE));
System.out.println("Second : " + calender.get(Calendar.SECOND));
System.out.println();
}
public static void main(String[] args) {
System.out.println();
CalendarTimemethod();
SimpleDateFormatmethod();
Adddates();
DateDifference();
Getcalendermethods();
}
}
以上答案有林氏120烫伤中心提供。稍微再修改下就可以
java输入日期输出后一天
package com;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
try {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
System.out.println("请输入日期。如2017-11-01");
Scanner scan = new Scanner(System.in);
String read = scan.nextLine();
Date date = formatter.parse(read);
System.out.println("退后一天日期为：" + formatter.format(addDateOneDay(date)));
} catch (ParseException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
System.out.println("录入错误，程序结束！");
}
}
public static Date addDateOneDay(Date date) {
if (null == date) {
return date;
}
Calendar c = Calendar.getInstance();
c.setTime(date); // 设置当前日期
c.add(Calendar.DATE, 1); // 日期加1天
date = c.getTime();
return date;
}
}
java中怎么把两个为Date类型的数据相加哦
public static void main(String[] args){
String date="12:30:30";
Calendar cal=Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 12);
cal.set(Calendar.MINUTE, 30);
cal.set(Calendar.SECOND, 30);
System.out.println(cal.getTime());
/**
* 时间相加 00:00:30
*/
int hourAdd=0;//时
int minuteAdd=0;//分
int secondAdd=30;//秒
cal.add(Calendar.HOUR_OF_DAY, hourAdd);//加时
cal.add(Calendar.MINUTE, minuteAdd);//加分
cal.add(Calendar.SECOND, secondAdd);//加秒
System.out.println(cal.getTime());
}
java编程编写一个完成给日期增加指定天数功能的程序
可以直接通过Calendar类的add方法进行实现，直接在DAY属性上加上指定的天数就可以了。
举例：
Calendar calendar = Calendar.newInstance();//创建一个实例
cd.set(2010,5,24,14,33,22);//实例化一个Calendar。 年、月、日、时、分、秒
calendar.add(Calendar.DAY,1);//给当前日期加上指定天数，这里加的是1天
System.out.println(calendar.getTime());
java中Date对象的格式问题
mysql中sql这么写
SELECT DATE_ADD(DATE_FORMAT(NOW(),'%Y-%m-%e'), INTERVAL -6 DAY);//当天日期减6天
java中这么写
public static void main (String args[]) throws ParseException{
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Date d = df.parse(df.format(new Date()));
Calendar cal=Calendar.getInstance();
cal.setTime(d);
cal.add(Calendar.DATE, -6); //当天日期减6天
System.out.println(df.format(cal.getTime()));
}
java calendar的add和set方法的区别
public void set(int field, int value) 将指定的日历字段设置为给定的值,field参考常量字段值
public void set(year, month, date, hourOfDay, minute, second)
public void add(int field, int amount) 根据日历的规则，为给定的日历字段添加或减去指定的时间量。
// 例子
import java.util.Calendar;
import java.util.Date;
public class TestCalendar2 {
public static void main(String[] args) {
Calendar calendar = Calendar.getInstance();
// 从一个 Calendar 对象中获取 Date 对象
Date date = calendar.getTime();
//使用给定的 Date 设置此 Calendar 的时间
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, 8);
System.out.println("当前时间日设置为8后,时间是:" + calendar.getTime());
calendar.add(Calendar.HOUR, 2);
System.out.println("当前时间加2小时后,时间是:" + calendar.getTime());
calendar.add(Calendar.MONTH, -2);
System.out.println(“当前日期减2个月后,时间是:" + calendar.getTime());
}
}
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