Thread: Overloading a method

Hello, Previously I was asked to post a specific question.. so I hope this one specific enough

This is in concern to the exercise mentioned here
http://www.javaprogrammingforums.com...ogramming.html

Now, here is my code:

 
public class DayType {
 
	final static int SUN = 1;
    final static int MON = 2;
    final static int TUE = 3;
    final static int WED = 4;
    final static int THU = 5;
    final static int FRI= 6;
    final static int SAT = 7;
 
    private int day;
 
    public DayType(int day) {
            this.day = day;
    }
 
    public void setDay(int day){
            this.day = day;
    }
 
    public int getDay() {
            return day;
    }
 
    public void print() {
            System.out.println(this.toString());
    }
    public int nextDay(){
            int next;
            if (day<7)
            {
            	next = (day + 1);
            }
            else
            {
            next = 1;
            }
            return next;
    }
    public int previousDay(){
            int prevDay;
            if (day>1)
            {
            	prevDay = (day - 1);
            }
            else
            {
            	prevDay = 7;
            }
            return prevDay;
    }
    public int addDays(int days) {
            return (day + days) % 7;
    }
            public String toString() {
            switch (this.day) {
            case SUN:
                    return "Sunday";
            case MON:
                    return "Monday";
            case TUE:
                    return "Tuesday";
            case WED:
                    return "Wednesday";
            case THU:
                    return "Thursday";
            case FRI:
                    return "Friday";
            case SAT:
                    return "Saturday";
            }
            return "";
    }       
    public static void main(String[] args) {
            System.out.println("******Test Day******");
            System.out.println();
            System.out.print("Set day: ");
            DayType d = new DayType(SUN);
            d.print();
            System.out.print("Next day: ");
            d.setDay(d.nextDay());
            d.print();
            System.out.print("Previous day: ");
            d.setDay(d.previousDay());
            d.print();
            System.out.print("After 5 days: ");
            d.setDay(d.addDays(5));
            d.print();
    }       
}

The output of this code is as follows:

******Test Day******
 
Set day: Sunday
Next day: Monday
Previous day: Sunday
After 5 days: Friday

First of all, the problem is that my previous day comes out to be Sunday instead of Saturday, even though I don't see any problem with the code.

Secondly, I don't know what overloading means in JAVA. I want to overload the methods for items A and C (from the question). The overloaded methods should accept and return an int value representing the day of week (e.g. Sunday = 1, Monday =2, …, Saturday = 7).

Please help me!
Thanks