missing return statement x(

[sub-zero]

Hi,
I'm writing a program and it saying their are two missing return statements .
can u help me to find the two missing return statements ?
:-|

import java.util.*;
   import java.io.*;



    public class DayOfWeek
   {
   
   
      static Scanner s = new Scanner(System.in);
   
   
   
       static public class Day
      {
      
         private String day;
      
          public Day()
         {
            day=" ";
         }
      
          public Day(String theDay)
         {
            setDay(theDay);
         }
      
          public void setDay(String theDay)
         {
            day = theDay;
         }
      
          public void printDay()
         {
            System.out.println(day);
         }
      
          public String getDay()
         {
            return day;
         }
      
          public String getNextDay()
         {
            if(day == "Saturday")
               return ("Sunday");
            else if(day == "Sunday")
               return ("Monday");
            else if(day == "Monday")
               return ("Tuesday");
            else if(day == "Tuesday")
               return ("Wednesday");
            else if(day == "Wednesday")
               return ("Thursday");
            else if(day == "Thursday")
               return ("Friday");
            else if(day == "Friday")
               return ("Saturday");
         }
      
          public String getPreDay()
         {
            if(day == "Friday")
               return ("Thursday");
            else if(day == "Thursday")
               return ("Wednesday");
            else if(day == "Wednesday")
               return ("Tuesday");
            else if(day == "Tuesday")
               return ("Monday");
            else if(day == "Monday")
               return ("Sunday");
            else if(day == "Sunday")
               return ("Saturday");
            else if(day == "Saturday")
               return ("Friday");
         }
      
      }
   
   
   
   
       public static void main (String args[])
      {
         Day myDay = new Day("Monday");
         Day tempDay = new Day("Sunday");
      
         myDay.printDay();
      
         System.out.println("The day previous "+ myDay +" is " + myDay.getPreDay());
      
         System.out.println("The next day of "+ myDay +" is "+ myDay.getNextDay());
      
      
         tempDay.printDay();
      
         System.out.println("The day previous "+ tempDay +" is " + tempDay.getPreDay());
      
         System.out.println("The next day of "+ tempDay +" is "+ tempDay.getNextDay());
      
      }
   
   
   }

Thanx,

[server_crash]

getNextDay() and getPreDay(). These methods don't have a default return value and may never return.

[sub-zero]

Thank u very much :D