Vector did not retrun the correct values.

Question

in my class the vector use BigDecimal not bigInteger. but my problem now is that my vector retruns the first value stored in vector until the loop completed.
the following is print statment while I add to the vector:
while (rs.next())
     CustNum=rs.getBigDecimal("CustNum");
     CType = rs.getString("TYPE");
     row.addElement(CustNum);
     row.addElement(CType);
     ret.addElement(row);
     System.out.println(CustNum);
***********1119
***********2220
***********3331
but in my JSP:
Vector v = new getNumber().getCustNumber();
Iterator i = v.iterator();
while (i.hasNext()) {
Vector row = (Vector)i.next();
Object CustNum = row.get(0);
Object name = row.get(1);
system.out.println(CustNum);
that retrun the wrong result:
***********1119
***********1119
***********1119

Answer 1

As warnerja said, you apparently only have multiple references to the same 'row' in your 'ret' Vector.
If your code in your post is exactly your actual code, then you are adding the same Vector to 'ret' multiple times. That Vector will have two values (CustNum and CType) for each row.
So, your 'ret' will have three elements, each with six elements (I separated the elements with commas):
ret.get(0):   ******1119, Type1, ******2220, Type2, ******3331, Type1
ret.get(1):   ******1119, Type1, ******2220, Type2, ******3331, Type1
ret.get(2):   ******1119, Type1, ******2220, Type2, ******3331, Type1Each element of 'ret' is identical--you have three copies of the same Vector.
In your loop to populate 'ret', initialize 'row' to a new Vector at the beginning of each loop iteration. Also, you may want to try using ArrayList instead of Vector. You probably don't need the synchronization that Vector gives. Even if you do need synchronization, use Collections.synchronizedList(new ArrayList()).