日期函数的Java[重复]

Question

谁能帮我写一下给任何日期增加天数的代码..？

例如，今天是2014年4月11日。我要2014年15-04 3天输出:2014年18-04。

我的问题不是将日期添加到当前日期…

Answer 1

import java.util.Calendar;
import java.text.SimpleDateFormat;

public class A {
    public static void main(String[] args) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy");

        Calendar calendar = Calendar.getInstance();    
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.MONTH, 1);
        calendar.set(Calendar.YEAR, 2012);
        calendar.add(Calendar.DAY_OF_MONTH, 3);

        System.out.println(simpleDateFormat.format(calendar.getTime()));
    }
}

Answer 2

String dateString = "11-04-2014" // Say you have a date in String format
SimpleDateFormat format = new SimpleDateFormat("MM-dd-yyyy"); // Create an instance of SimpleDateFormat with the right format.
Date date = format.parse(dateString); // Then parse the string, this will need a try catch statement.
Calendar calendar = Calendar.getInstance(); // Get an instance of the calendar.
calendar.setTime(date); // Set the time of the calendar to the parsed date
calendar.add(Calendar.DATE, 3); // Add the days to the calendar
String outputFormat = format.format(calendar.getTime());

Answer 3

使用Java8，您可以编写：

import java.time.LocalDate;

LocalDate date = LocalDate.of(2014, 4, 11);
LocalDate newDate = date.plusDays(3);
System.out.println(newDate); //  Prints 2014-04-14

就这么简单。