I created a vector and added objects, but the vector is empty

Question

I created an object called a facility, it accepts 2 strings in the creator but stores the data as a string and a float. as you can see from the code below, i have tried to create a vector object to contain facilitys and named it entries. when i add objects to this vector, the vectors size does not change, and i cannot access elements of it via their index. but when i print the vector out i can see the elements? what is going on here. i am very confused. ps, if it helps i havent worked with vectors much before.
FacilitysTest.java
import java.util.*;
public class FacilitysTest {
     public static void main (String [] args) {
     Facilitys entries = new Facilitys();
     entries.add("Stage","3.56");
     entries.add("kitchen","5.00");
     entries.add("heating","2");
//     System.out.println(entries.firstElement() );
     System.out.println("printing out entries");
     System.out.println(entries);
     System.out.println();
     System.out.println("There are "+entries.size()+" entries");
     System.out.println();
     System.out.println("modifying entry 2");
     entries.setElementAt(new Facility("lighting","1.34"), 2);
     System.out.println(entries);
     System.out.println();
     System.out.println("deleting entry 1");
     entries.remove(1);
     System.out.println(entries);
}the following is what happens when i run this code.
the number (0,1,2) is taken from a unique number assigned to the facility and is not anything to do with the facilitys position in the vector.
printing out entries
Facility number: 0, Name: Stage , Cost/Hour: 3.56
Facility number: 1, Name: kitchen , Cost/Hour: 5.0
Facility number: 2, Name: heating , Cost/Hour: 2.0
There are 0 entries
modifying entry 2
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 >= 0
at java.util.Vector.setElementAt(Vector.java:489)
at FacilitysTest.main(FacilitysTest.java:17)
Press any key to continue . . .
Facilitys.java
import java.util.*;
public class Facilitys extends Vector {
     private Vector entries;
     public Facilitys( ) {
             entries = new Vector();
    public void add( String name, String price ) {
         entries.add((new Facility( name, price) ));
    public Facility get(int index) {
          return ((Facility)entries.get(index));
     public float total() {
          float total = 0;
          for (int i = 0; i<entries.size();i++) {
               total = total + ( (Facility)entries.get(i) ).getPricePerHour();
          return total;
    public String toString( ) {
        StringBuffer temp = new StringBuffer();
        for (int i = 0; i < entries.size(); ++i) {
            temp.append( entries.get(i).toString() + "\n" );
        return temp.toString();
}

Answer 1

are you reffering to where i have public class
Facilitys extends Vector {
     private Vector entries;
     public Facilitys( ) {
             entries = new Vector();
That's correct. That's your problem.
i added the extends Vector, because without it i got
the following errors
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:14: cannot find symbol
symbol : method size()
location: class Facilitys
System.out.println("There are "+entries.size()+"
" entries");That's because you haven't implemented a size method in your class.
^
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:17: cannot find symbol
symbol : method setElementAt(Facility,int)
location: class Facilitys
entries.setElementAt(new
w Facility("lighting","1.34"), 2);That's because you haven't implemented setElementAt in your class.
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:21: cannot find symbol
symbol : method remove(int)
location: class Facilitys
     entries.remove(1);
^That's because you haven't implemented remove in your class.
/Kaj