How to test a class with array which is being declared?

Question

Dear All
I am doing a question which involved the day of the week.
I had written a class which is name WeekDay and here is the code :
public class WeekDay
private int index;
private static String[]dayStrings = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
public WeekDay(int idx)
index = idx;
public int getIndex()
return index;
public static String nextDay(int index)
index+=1;
return dayStrings[index];
The above compile well with no issue.
Here is the problem which i need to seek your help, I had created a program to test the above program.
But I am not sure how to test it.
Here is what I had written :
public class TestWD
public static void main(String[]args)
System.out.println("Please key in a digit to get the day of the week\n");
System.out.println("Sun, Mon, Tue.....Sat is represented by 0,1,2,3...6");
int idx = Integer.parseInt(args[0]);
WeekDay wd = new WeekDay(dayStrings[]); // I can't seem to declare this line.
My question how can I test the above program ?? I can't seem to be able to declare a "wd" from WeekDay. The dayStrings wich i had declared in the WeekDay class is a String array. But how can I declare a suitable line in my test program in order for me to test my program?
What I wanted to do is to get the above line running and than I will proceed on to code it to display the day after a day...for example, if today is Wednesday and when I run the wd.nextDay(index). It will return me Thursday!
But I am not sure how to declare the above...please enlighten me.
Thank you.

Answer 1

Hi
Thank you for helping but when I compile my program. It seem fine but when I execute it, it prompt me with an error message :
code}public class TestWD
public static void main(String[]args)
System.out.println("Please key in a digit to get the day of the week\n");
System.out.println("Sun, Mon, Tue.....Sat is represented by 0,1,2,3...6");
* int idx = Integer.parseInt(args[0]);*
WeekDay wd = new WeekDay(idx);
System.out.println(wd.nextDay(idx));
}{java.lang.ArrayIndexOutOfBoundsException: 0
     at TestWD.main(TestWD.java:8)
Edited by: SummerCool on Nov 1, 2007 2:53 AM