public class CalendarTest {

    public static void main(String[] args) {

        // 获取当前年份、月份、日期

        Calendar cale = null;

        cale = Calendar.getInstance();

        int year = cale.get(Calendar.YEAR);

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

        int day = cale.get(Calendar.DATE);

        int hour = cale.get(Calendar.HOUR_OF_DAY);

        int minute = cale.get(Calendar.MINUTE);

        int second = cale.get(Calendar.SECOND);

        int dow = cale.get(Calendar.DAY_OF_WEEK);

        int dom = cale.get(Calendar.DAY_OF_MONTH);

        int doy = cale.get(Calendar.DAY_OF_YEAR);

        System.out.println("Current Date: " + cale.getTime());

        System.out.println("Year: " + year);

        System.out.println("Month: " + month);

        System.out.println("Day: " + day);

        System.out.println("Hour: " + hour);

        System.out.println("Minute: " + minute);

        System.out.println("Second: " + second);

        System.out.println("Day of Week: " + dow);

        System.out.println("Day of Month: " + dom);

        System.out.println("Day of Year: " + doy);

        // 获取当月第一天和最后一天

        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

        String firstday, lastday;

        // 获取前月的第一天

        cale = Calendar.getInstance();

        cale.add(Calendar.MONTH, 0);

        cale.set(Calendar.DAY_OF_MONTH, 1);

        firstday = format.format(cale.getTime());

        // 获取前月的最后一天

        cale = Calendar.getInstance();

        cale.add(Calendar.MONTH, 1);

        cale.set(Calendar.DAY_OF_MONTH, 0);

        lastday = format.format(cale.getTime());

        System.out.println("本月第一天和最后一天分别是 ： " + firstday + " and " + lastday);

        // 获取当前日期字符串

        Date d = new Date();

        System.out.println("当前日期字符串1：" + format.format(d));

        System.out.println("当前日期字符串2：" + year + "/" + month + "/" + day + " "

                + hour + ":" + minute + ":" + second);

    }

}