如何比较 LocalDate 和 Calendar class 的对象？

Question

我正在尝试比较两个具有不同类型的对象的日期。有什么方法可以将 Calendar 对象转换为 LocalDater，反之亦然？

谢谢:)

public class ABC{

    public static void main(String args[]){
        Calendar c1= Calendar.getInstance();
        LocalDate c2= LocalDate.now();      
        System.out.println(c1.compareTo(c2));
    }
}

Answer 1

    private int compare(Calendar c1, LocalDate c2) {
        int yearCompare = ((Integer) c1.get(Calendar.YEAR)).compareTo(c2.getYear());
        if (yearCompare == 0)
            return ((Integer) c1.get(Calendar.DAY_OF_YEAR)).compareTo(c2.getDayOfYear());
        else
            return yearCompare;
    }

Answer 2

您需要比较日期，所以我们就这样做吧。

使用this answer作为参考：

Calendar calendar = Calendar.getInstance();
LocalDate localDate = LocalDate.now();

LocalDate calendarAsLocalDate = calendar.toInstant()
    .atZone(calendar.getTimeZone().toZoneId())
    .toLocalDate();

return calendarAsLocalDate.compareTo(localDate)

如何比较 LocalDate 和 Calendar class 的对象？

How to compare objects of LocalDate and Calendar class?

java

localdate

java-calendar