从Date类向随机日期添加Years [英] Adding Years to a random date from Date class

问题描述

比方说我有这个:

 PrintStream out = System.out;
 Scanner in = new Scanner(System.in);
 out.print("Enter a number ... ");
 int n = in.nextInt();

我有一个随机日期，例如2015年5月6日(这不是固定日期，每次都是随机的).如果我想取这个日期的年份"，并在今年加上"n"，我该怎么做?

I have a random date, for example, 05/06/2015 (it is not a fixed date, it is random every time). If I want to take the 'year' of the this date, and add whatever 'n' is to this year, how do i do that?

Date类中的所有方法都不是'int'.

None of the methods in the Date Class are 'int'.

要从一个整数中添加年份，"years"也必须是一个整数.

And to add years from an int, 'years' has to be an int as well.

推荐答案

您需要将 Date 转换为 Calendar .

Calendar c = Calendar.getInstance();
c.setTime(randomDate);
c.add(Calendar.YEAR, n);
newDate = c.getTime();

您可以将Year(或其他字段)用作日历，然后将其转换回Date.

You can manipulate the Year (or other fields) as a Calendar, then convert it back to a Date.

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