我可以用 Iterator 类做什么？它说“DeckIterator 不是抽象的，并且不会覆盖 java.util.Iterator 中的抽象方法 remove()”
import java.util.*;
import java.io.Serializable;
public class Deck implements Iterable<Card>, Serializable {
// The field for a List
private List<Card> deck;
/**
* Constructor creates the list, initializes all the cards in the deck and
* shuffles them
*/
public Deck() {
deck = new ArrayList<Card>();
for (Card.Rank r : Card.Rank.values()) {
for (Card.Suit s : Card.Suit.values()) {
deck.add(new Card(r, s));
}
}
shuffle();
// Converting to a LinkedList
List<Card> list = new LinkedList<Card>();
for (int i = 0; i < deck.size(); i++) {
list.add(deck.get(i));
}
deck = list;
}
/**
* Method to randomize the cards
*/
public void shuffle() {
Collections.shuffle(deck);
}
/**
* Method that removes the top card from the deck
*
* @return the top card
*/
public Card deal() {
return deck.remove(0);
}
/**
* Number of cards remaining in the deck
*
* @return number of cards in the deck
*/
public int size() {
return deck.size();
}
/**
* Reinitializes the deck.
*/
public void newDeck() {
List<Card> newList = new LinkedList<Card>();
for (int i = 0; i < deck.size(); i++) {
newList.add(deck.get(i));
}
deck = newList;
}
public Iterator<Card> iterator(){
Iterator<Card> aDeck = deck.iterator();
return aDeck;
}
它说“DeckIterator 不是抽象的，并且不会覆盖 java.util.Iterator 中的抽象方法 remove()”
public class DeckIterator implements Iterator<Card> {
public List<Card> reverseIterator(){
List<Card> reverseList = new LinkedList<Card>();
for(int i = deck.size()-1; i >= 0; i--){
reverseList.add(deck.get(i));
}
return reverseList;
}
}
public static void main(String[] args){
Deck myDeck = new Deck();
System.out.println("The card " + myDeck.deal() + " is not in the deck now");
}
}