面试居然让我获取当前月份第一天跟最后一天，主要是尴尬的回答不上来。

废话不说，直接贴代码，工作应该是够用了

public class TestCalendar {    // 日期也就是这了    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);        Date time = cale.getTime();        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());        Date time2 = cale.getTime();        System.out.println(time);        System.out.println(time2);        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);        SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");        System.out.println(format2.format(d));    }}

到位！！！都属于基础，记一下罢了。