Errors in vectors as sets

Question

I developed this class Set that has methods to add, remove elements from a set etc. The code is as follow:
public class Set {
private Vector aSet = new Vector();
public Set (int n) {
aSet.setSize(n);
// check if object is in the set
public boolean isInSet (Object o){
if (!aSet.contains(o)) return true;
else return false;
//check if set is full
public boolean isFull(){
int size = aSet.size();
if (aSet.elementAt (size) ==null) return true;
else return false;
// check if set is empty
public boolean isEmpty(){
if (aSet.isEmpty()) return true;
else return false;
// add element to a set
public void addElement (Object o){
if(!isFull()) aSet.addElement (o);
// remove element
public void removeElement (Object o){
if (isInSet(o)) aSet.addElement (o);
I tested this with the following code:
public class TestSet {
public static void main (String [] args) {
System.out.println ("Testing the methods of Set\n");
// Create strings to be elements in a Set
String s1 = "String1";
String s2 = "String2";
// TEST Set and isEmpty
//System.out.println("Create new empty Set size 2");
Set aSet = new Set(2);
if (aSet.isEmpty()) {
System.out.println ("New empty set, size 2, has been created\n");
// TEST addElement AND printSet
aSet.addElement(s1);
System.out.println ("After adding String1 set = ");
aSet.printSet();
aSet.addElement(s1);
System.out.println ("\nAfter trying to add Sting1 again, set =");
aSet.printSet ();
// TEST isFull
aSet.addElement(s2);
System.out.println ("\nAfter adding String2, set is =");
aSet.printSet ();
if (aSet.isFull())
System.out.println ("\nAfter adding String2, set is full");
// TEST removeElement
aSet.removeElement(s1);
System.out.println ("\nAfter removing String1, set = ");
aSet.printSet ();
aSet.removeElement(s2);
if (aSet.isEmpty())
System.out.println ("\nAfter removing String2, set is empty ");
I receive the message that method printSet () is not found in class Set. Could anyone please point out what am I doing wrong here.
Many thanks

Answer 1

Hi,
You are trying to call the method printSet, but you have not implemented a method named printSet in the Set class that you posted.
/Kaj