Unable to override the method get(int) in java.util.AbstractList

Question

package util;
import java.util.Vector;
import java.lang.Integer;
public class integerVector extends Vector
public integerVector() { //construct a Vector()
super();
public integerVector(int m) { // construct a Vector(m)
super(m);
public integerVector(int m, int n) { // construct a Vector(m,n)
super(m,n);
public void set (int i, int n) {
Integer ii= new Integer(i) ;
setElementAt(ii,n);
when i try compiling this i get the following error:
integerVector.java:37: get(int) in util.integerVector cannot override get(int) i
n java.util.AbstractList; attempting to use incompatible return type
found : java.lang.Integer
required: java.lang.Object
public Integer get(int n) {
It would be very helpful if anyone can provide the solution

Answer 1

The method's signature is defined by the Interface java.util.List.
public Object get(int index)
instead you want to implement
public Integer get(int index)
Yes you could write a class with this method, and call it IntegerList or similar.
However it could not implement the List interface, or extend any of the List classes.
Instead of extending Vector (or ArrayList) you could delegate to it.
That way you're not extending the class, and not changing the signature of a method.
public class IntegerList(){
  private List internalList = new ArrayList();
  public Integer get(int index){
    return (Integer)internalList.get(index);
}This class would be of limited use though, because you couldn't treat it as a regular list because it hasn't implemented the interface properly.
The best you could do would be to have it implement the collection interface, which doesn't expose the specific get methods.