Type safety / List is a raw type - class

Question

Hi i'm getting this warning and I need help on how to fix it, it appears under my combine method which merges two existing lists together, the warning is
Type safety: The expression of type List needs unchecked conversion to conform to List and List is a raw type. References to generic type List should be paramaterized.
For my equals method, my List class says that it's a raw type as well
public class List<T> implements ListInterface<T> {
private int lastIndex;
private Object[] elements;
public List() {
elements = new Object[10];
lastIndex = 0;
}
public List<T> combine(List<T> list2) {
List<T> l = new List(); // This is where the warning is underlined
try {
for (int i = 1; i <= lastIndex; i++)
l.add (retrieve (i));
for (int i = 1; i <= list2.lastIndex; i++)
l.add (list2.retrieve (i));
}
catch (ListException e) {
System.out.println("Should not occur (Combine)");
}
return l;
}
public boolean equals(Object list) {
if (list == null) {
return false;
}
List myList = (List)list; // cast to type List // Under each List, it says it is a raw type. References to generic type List<T> should be paramaterized.
if (myList.getClass() != this.getClass()) {
return false;
}
if (myList.length() != this.length()) {
return false;
}
try {
for (int pos = 1; pos <= lastIndex; pos++) {
if (!myList.retrieve(pos).equals(this.retrieve(pos))) {
return false;
}
}
}
catch (ListException e) {
System.out.println("Should not occur");
}
return true;
}
}
Thank you!