java日期获取前一天和后一天

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package com.liutao.calendar;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateTest {
   public static void main(String[] args) {

       //String s = getSpecifiedDateYes("2013-04-14");
       String s = getSpecifiedDateTom("2013-04-15");
       System.out.println(s);

   }
   //特定时期的前一天
   public static String getSpecifiedDateYes(String specified){
       Calendar c = Calendar.getInstance();
       Date date=null;
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
       String calendar="";
       try {
           date=sdf.parse(specified);
           c.setTime(date);
           //第一种方法 c.add(Calendar.DATE, -1);
           //第二种方法
           int day = c.get(Calendar.DATE);
           c.set(Calendar.DATE, day - 1);
           calendar = sdf.format(c.getTime());
       } catch (ParseException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

       return calendar;
   }
   //特定时期的后一天
   public static String getSpecifiedDateTom(String specified){
       Calendar c = Calendar.getInstance();
       Date date=null;
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
       String calendar="";
       try {
           date=sdf.parse(specified);
           c.setTime(date);
           //第一种方法 c.add(Calendar.DATE, -1);
           //第二种方法
           int day = c.get(Calendar.DATE);
           c.set(Calendar.DATE, day + 1);
           calendar = sdf.format(c.getTime());
       } catch (ParseException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

       return calendar;
   }
}