Java 1.8版本对数据时间API进行了很好的更新。

下面是一段代码:

    LocalDate lastAprilDay = LocalDate.of(2014, Month.APRIL, 30);
    System.out.println("last april day: " + lastAprilDay);
    LocalDate firstMay = lastAprilDay.plusDays(1);
    System.out.println("should be first may day: " + firstMay);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd");
    String formatDate = formatter.format(firstMay);
    System.out.println("formatted date: " + formatDate);

输出:

last april day: 2014-04-30
should be first may day: 2014-05-01
formatted date: 01

要了解更多信息，请参阅此类的Java文档:

LocalDate DateTimeFormatter

java8时间API:

Instant now = Instant.now(); //current date
Instant after= now.plus(Duration.ofDays(300));
Date dateAfter = Date.from(after);

我更喜欢用joda来计算日期和时间，因为它可读性更好:

Date tomorrow = now().plusDays(1).toDate();

Or

endOfDay(now().plus(days(1))).toDate()
startOfDay(now().plus(days(1))).toDate()

我将向您展示如何在Java 8中做到这一点。给你:

public class DemoDate {
    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        System.out.println("Current date: " + today);

        //add 1 day to the current date
        LocalDate date1Day = today.plus(1, ChronoUnit.DAYS);
        System.out.println("Date After 1 day : " + date1Day);
    }
}

输出:

Current date: 2016-08-15
Date After 1 day : 2016-08-16

使用DateTime对象。加上任何你想要的时间等等。 希望这有用:)

你可以像这样尝试java.util.Date库-

int no_of_day_to_add = 1;

Date today = new Date();
Date tomorrow = new Date( today.getYear(), today.getMonth(), today.getDate() + no_of_day_to_add );

根据需要更改no_of_day_to_add的值。

我设置了no_of_day_to_add的值为1，因为你只想添加一天。

更多信息可以在本文档中找到。