How to use Vectors ?????????

Question

Hi guys, i am a newbie in java and about to die due to some stressful assignments. I am not asking u to help in assignment. Just please share some knowledges about vector. How to use it? so that i can use it in my assignment. Thank u .
AND IN THIS CODE BELOW: WHY DO WE HAVE TO IMPORT MARK;
THERE IS ANOTHER CLASS CALLED MARK DEFINED ELSEWHERE.
import java.util.Vector;
import Mark;
public class Student {
private String name;
private Vector subjectResults; // the implementation of the relationship from Student - Mark
public Student (String name) {
this.name = name;
subjectResults = new Vector ();
public void insertMark (int value) {
this.subjectResults.addElement (new Mark (value)); // WHAT DOES THIS LINE MEAN ?
public int findHighestMark () {
int size = subjectResults.size (); //cache the result
int highestMark = 0;
for (int i = 0; i < size; i++) {
Mark result = (Mark) subjectResults.get (i); //WHY DO WE HAVE TO PUT "(MARK)" ?
if (result.get () > highestMark) {
highestMark = result.get ();
return highestMark;

Answer 1

I'm going to guess that Mark is a class provided to you. Do you have the Mark.java file? Or only Mark.class? If you have Mark.java, see if the first line is package Mark;
It shouldn't be.
You shouldn't need to import Mark.
A vector is a like a dynamic array (not really, but in simple terms it is), you can keep adding things to it. You can insert stuff in the middle, you can extract stuff from the middle (doesn't leave a gap).
You use it with:
public void addElement(Object toAdd)
public Object elementAt(int index)
These are the two most important methods of Vector.
Note that it returns an Object. You won't be able to do anything useful with an Object (except for toString()), so you'll need to cast it to whatever you're expecting (Student or Mark or something).
That's the basics of Vectors, hope this helps,
Radish21