Re-initiate Vectors in Loop

Question

import java.util.Vector;
public class testClass {
   private Vector basket = new Vector();
   private Vector vowels = new Vector();
   testClass(){
       basket.add("apple");
       basket.add("orange");
       basket.add("starfruit");
       basket.add("strawberry");
       basket.add("peanut");
       basket.add("walnut");
       vowels.add("a");
       vowels.add("e");
       vowels.add("i");
       vowels.add("o");
       vowels.add("u");
   public void findVowels(){
       for (int i = 0; i < vowels.size(); i++) {
           Vector basket = this.basket; //resets local variable basket (hopefully)
           System.out.println("This is the list for letter "  +vowels.get(i));+
+           for (int j = 0; j < basket.size(); j++) {
               if (listOfItems.get(j).toString().contains(vowels.get(i).toString())) {
                   System.out.println(baskets.get(j));
                   basket.remove(j); //will this line remove from the local copy or the global copy?
           System.out.println("");
   }Hello everyone. Based on the code above, I'm trying to extract elements which contains vowels a, e, i, o and u in order. The result of the class above is below:
This is the list for letter a
apple
starfruit
peanut
This is the list for letter e
orange
This is the list for letter i
This is the list for letter o
This is the list for letter u
walnutMy question is, why doesn't this line ( Vector basket = this.basket; ) reset basket for subsequent loops?
Thanks in advance.

Answer 1

OK, the first statement creates a new Vector. But the effect of the second statement is to make the local variable once again refer to the basket referred to by the instance variable. Since nothing now refers to the newly created Vector it has effectively disappeared. So, once again, removing things from the basket will be permenent.
What you need to do is create a new basket and then add the contents of the other one to it.
Vector basket = new Vector(this.basket); // this creates and adds the contents in one step
System.out.println(// etc(See the [Vector constructor documentation|http://java.sun.com/javase/6/docs/api/java/util/Vector.html#Vector(java.util.Collection)])