java - 如何确定 Java 中两个日历对象之间传递的时间？

Question

计算 java 中两个日历日期之间的时间量的最佳方法是什么。我正在编写一个方法来确定两个日期之间经过的月数，并根据预定义的月数返回一个 boolean 值。这是我的代码(不能正常工作)。

此代码始终返回 false。此代码也没有考虑经过的天数。如果开始日期是在月底，这可能会成为问题。没有简单的compareTo方法吗？

private boolean hasMatured()
{
    Calendar now = Calendar.getInstance();

    Calendar start = (Calendar) super.dateOpened.clone();

    int nowYear = now.get(Calendar.YEAR);
    int nowMonth = now.get(Calendar.MONTH);

    int startYear = start.get(Calendar.YEAR);
    int startMonth = start.get(Calendar.MONTH);

    int monthsElapsed = (nowYear - startYear) * 12 + (nowMonth - startMonth);

    return monthsElapsed>PERIOD_IN_MONTHS;
}

Answer 1

int nowYear = now.get(Calendar.YEAR);
int nowMonth = now.get(Calendar.MONTH);

int startYear = now.get(Calendar.YEAR);
int startMonth = now.get(Calendar.MONTH);

int monthsElapsed = (nowYear - startYear) * 12 + (nowMonth - startMonth);