java - 如何在java中生成 future 14天的日期？

Question

public class datefornext14days {
    public static void main(String[] args) {
        final Calendar c = Calendar.getInstance();
        int day=c.get(Calendar.DAY_OF_MONTH);
        for (int i = 1;  i<=14; i++) {
            System.out.println(day);
            c.add(c.get(Calendar.DAY_OF_MONTH), 1); 
        }
    }
}

执行代码时出现以下错误:-

Exception in thread "main" java.lang.IllegalArgumentException at java.util.GregorianCalendar.add(Unknown Source) at TodayDate.main(TodayDate.java:28)

我希望我的输出是 - 从当天开始并迭代到接下来的 14 天。

Answer 1

删除c.get(。add的第一个参数是单位常量

c.add(Calendar.DAY_OF_MONTH, 1);

有关更多信息，请参阅 javadoc .

并按以下方式输出日期:

System.out.println(c.get(Calendar.DAY_OF_MONTH));

所以你的代码必须如下所示:

public static void main(String[] args) {
    final Calendar c = Calendar.getInstance();

    for (int i = 1; i <= 14; i++) {
        System.out.println(c.get(Calendar.DAY_OF_MONTH));
        c.add(Calendar.DAY_OF_MONTH, 1);
    }

}