java获得指定日期的前一天，后一天的代码

/
获得指定日期的前一天
@param specifiedDay
@return
@throws Exception
/
public static String getSpecifiedDayBefore(String specifiedDay){
//SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
Date date=null;
try {
date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
} catch (ParseException e) {
e.printStackTrace();
}
c.setTime(date);
int day=c.get(Calendar.DATE);
c.set(Calendar.DATE,day-1);

String dayBefore=new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
return dayBefore;
}
/
获得指定日期的后一天
@param specifiedDay
@return
/
public static String getSpecifiedDayAfter(String specifiedDay){
Calendar c = Calendar.getInstance();
Date date=null;
try {
date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
} catch (ParseException e) {
e.printStackTrace();
}
c.setTime(date);
int day=c.get(Calendar.DATE);
c.set(Calendar.DATE,day+1);

String dayAfter=new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
return dayAfter;
}