从类内部的方法调用构造函数

Question

I am trying to implement a reset function for a class and the easiest way to go about it would be to use removeAll() on the arraylist and call the constructor. However that does not seem to work either because I have the wrong syntax for it for it I am trying something I can't do.

As of now I have a working method, but I would like to clean it up as it is just repeated code (All expect the removeAll() statement) from the constructor which is called StandardDeck() .

public void reset(){
    cardArray.removeAll(cardArray);
    for(int suit = 0; suit < 4; suit++){
        for(int rank = 0; rank < 13; rank++){
            PlayingCard card = new PlayingCard(suit, rank);
            cardArray.add(card);
        }
    }
}

Answer 1

If I understand well your need, you want this :

public class StandardDeck {

    List<PlayingCard> cardArray = new ArrayList<>();

    public StandardDeck() {
       reset();
    }

    public void reset() {
        cardArray.clear();
        for(int suit = 0; suit < 4; suit++){
          for(int rank = 0; rank < 13; rank++){
            PlayingCard card = new PlayingCard(suit, rank);
            cardArray.add(card);
          }
        }
    }
}

No need to duplicate the loop. And as I pointed before clear is the standard and optimal solution to clear a list.