Are Vector Integer and Vector String different types?

Maybe I am missing something.
Are Vector <String> and Vector <Integer> different types? Can I have to methods of the same name with arguments of these types? That would be the point of method overloading.
Appearently not. The following code does not compile:
import java.util.*;
public class b {
        public static void doit(Vector <String> what) {
                what.add(new String(""));
        public static void doit(Vector <Integer> what) {
                what.add(new Integer(0));
}$ javac -target 1.5 -source 1.5 b.java
b.java:3: name clash: doit(java.util.Vector<java.lang.String>) and doit(java.util.Vector<java.lang.Integer>) have the same erasure
public static void doit(Vector <String> what) {
^
b.java:6: name clash: doit(java.util.Vector<java.lang.Integer>) and doit(java.util.Vector<java.lang.String>) have the same erasure
public static void doit(Vector <Integer> what) {
^
2 errors

So it is not possible to have both methods in a class. Let us do instanceof instead.
import java.util.*;
public class b {
        public static void doit(Vector what) {
                        if (what instanceof Vector<String>) {
                               what.add(new String(""));
                        else if (what instanceof Vector<Integer>) {
                               what.add(new Integer(0));
}javac -target 1.5 -source 1.5 b.java
b.java:4: illegal generic type for instanceof
if (what instanceof Vector<String>) {
^
b.java:7: illegal generic type for instanceof
else if (what instanceof Vector<Integer>) {

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