踩坑系列-Java Calendar

Calendar是Java util包下的日期Api,其中获取月份是当前月份-1

public class Demo {

    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        System.out.println(new Date().toInstant());
        System.out.println(calendar.get(Calendar.MONDAY));
    }
}