Java日期循环，Java获取当月的第一天和最后一天

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1、Java日期循环

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

String   dateStr1="2008-3-16";

String      dateStr2="2008-3-24";

java.util.Date dateBegin=formater.parse(dateStr1);

java.util.Date dateEnd=formater.parse(dateStr2);



Calendar   ca=Calendar.getInstance();

while(dateBegin.compareTo(dateEnd)<=0){

             ca.setTime(dateBegin);

              ca.add(ca.DATE,1);//把dateBegin加上1天然后重新赋值给date1

              dateBegin=ca.getTime();

       }

2、Java获取当月的第一天和最后一天

// 获取Calendar
Calendar calendar = Calendar.getInstance();
// 设置Calendar月份数为下一个月
calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + 1);
// 设置Calendar日期为下一个月一号
calendar.set(Calendar.DATE, 1);
// 设置Calendar日期减一,为本月末
calendar.add(Calendar.DATE, -1);

// 打印
DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(format.format(calendar.getTime()));


//循环输出日期
public static void main(String[] arg) throws Exception {
        GregorianCalendar g = new GregorianCalendar();
        g.setTime(new Date());
        int day = g.get(Calendar.DAY_OF_YEAR);
        int year = g.get(Calendar.YEAR);
        for (int i = 0; i < 400; i++) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            String formatTime = sdf.format(g.getTime());
            System.out.println(formatTime);
            if(g.get(Calendar.YEAR) > year) {
                day = 0;
                year = g.get(Calendar.YEAR);
            }
            g.set(Calendar.DAY_OF_YEAR, day + 1);
            day++;
        }
    }

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