Calendar rightNow = Calendar.getInstance();

 int month  =rightNow.MONTH;

 int day = rightNow.DAY_OF_MONTH;

结果是month为2,而day为5,和现在的日期4.26没有关系

我然后用System.out.println(rightNow);,不过输出的很多内容里面的MONTH和DAY_OF_MONTH是对的

后来,在网上查找,不能这么用

应该用

 int month  = (date.get(Calendar.MONTH))+1;

        int day = date.get(Calendar.DAY_OF_MONTH);

获取当前的月份和日期

试了一下,果然正确

后来查看java doc文档,MONTH字段解释如下

Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year is JANUARY which is 0; the last depends on the number of months in a year.

这个字段的值只是说明get()的属性字段值,来获取month的

 

以下为获取其它:

Calendar cal = Calendar.getInstance();

        //当前年

        int year = cal.get(Calendar.YEAR);        //当前月        int month = (cal.get(Calendar.MONTH))+1;        //当前月的第几天：即当前日        int day_of_month = cal.get(Calendar.DAY_OF_MONTH);        //当前时：HOUR_OF_DAY-24小时制；HOUR-12小时制        int hour = cal.get(Calendar.HOUR_OF_DAY);        //当前分        int minute = cal.get(Calendar.MINUTE);        //当前秒        int second = cal.get(Calendar.SECOND);        //0-上午；1-下午        int ampm = cal.get(Calendar.AM_PM);        //当前年的第几周        int week_of_year = cal.get(Calendar.WEEK_OF_YEAR);        //当前月的第几周        int week_of_month = cal.get(Calendar.WEEK_OF_MONTH);        //当前年的第几天        int day_of_year = cal.get(Calendar.DAY_OF_YEAR);

// 前一个月

SimpleDateFormat  sdf = new SimpleDateFormat("MM");

        Calendar cal = Calendar.getInstance();        cal.add(Calendar.MONTH, -1);        System.out.println(sdf.format(cal.getTime()));