java 獲取某年某月最后一天

        Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.YEAR, 2016);
    calendar.set(Calendar.MONTH, 02);
    int  day = calendar.getActualMaximum(Calendar.DATE);
        
    calendar.set(Calendar.DAY_OF_MONTH, day);
    String lastDayOfMonth = (new SimpleDateFormat("yyyy-MM-dd")).format(calendar.getTime());
        
        
    System.out.println(lastDayOfMonth);