vector problem

[mambo_jumbo]

i have two vectors a and b.
i need to write elements from vector b that are at the same index as equal elements in vector a.
if in vector a elements a(0) and a(5) are equal i write b(0) and b(5) into another vector.

for (int i=0, n=a.size(); i<n; i++){
onenode = (String)a.get(i);
if (!visited.contains((String)a.get(i))){
for (int j=0, m=a.size(); j<m; j++){
secondnode = (String) a.get(j);
if (secondnode.equals(onenode)){
selectednets.add((String)b.get(j));
}
}
visited.add(onenode);
}
// selectednets.removeAllElements();
}
if i uncoment vector clear i get empty vector and if i leave it all elements of b are stored in the selectednets vector.
can anybody explane what am i doing wrong?

[hardwired]

import java.util.*;

public class TransferTest {
    public static void main(String[] args) {
        String[] aItems = {
            "Bob", "Sue", "John", "Salley", "Vincent", "John", "Bob", "Sue"
        };
        String[] bItems = {
            "Bob", "Jessica", "John", "Philip", "Salley", "Vincent", "Bob", "Ed"
        };
        Vector<String> a = new Vector<String>(Arrays.asList(aItems));
        Vector<String> b = new Vector<String>(Arrays.asList(bItems));
        Vector<String> selectednets = new Vector<String>();

        // elements from vector b that are at the same index
        // as equal elements in vector a
        for (int i=0, n=a.size(); i<n; i++){
            String onenode = (String)a.get(i);
            if (!selectednets.contains(onenode)){
                String secondnode = (String) b.get(i);
                if (secondnode.equals(onenode)){
                    selectednets.add(secondnode);
                }
            }
        }
        System.out.println(selectednets);
        selectednets.removeAllElements();

        // Identify pairs of equal-value elements in a that occur in b 
        // at the same indices and copy the element into selectednets.
        // Only the first occurrence of duplicates will be checked.
        for (int i=0, n=a.size(); i<n; i++){
            String onenode = (String)a.get(i);
            for(int j = i+1; j < n; j++) {
                String element = (String)a.get(j);
                if(onenode.equals(element)) {
                    // Found duplicate value.
                    if(!selectednets.contains(onenode)){
                        String secondnode = (String) b.get(i);
                        if(secondnode.equals((String)b.get(j)) &&
                           onenode.equals(secondnode)) {
                            selectednets.add(secondnode);
                            System.out.println("Found " + onenode + " in a at " +
                                               "indices " + i + " and " + j +
                                               " and the matching\nvalue " +
                                                secondnode + " in b at indices " +
                                                i + " and " + j + ".");
                        }
                    }
                }
            }
        }
        System.out.println(selectednets);
    }
}