对象的数组列表到字符串数组

Question

I'm trying to convert an ArrayList that contains "cards", or objects that store two numbers, a rank and a suit. Normally to get a single instance of the card, I use:

dealer.dealerhand.get(1).showstats();

Where showstats returns a string and is:

public String showstats()
{
    String realsuit = "";
    if(this.suit == 0)
    {
        realsuit = "Diamonds";
    }
    else if(this.suit == 1)
    {
        realsuit ="Hearts";
    }
    else if(this.suit == 2)
    {
        realsuit = "Clubs";
    }
    else if(this.suit == 3)
    {
        realsuit = "Spades";
    }
    String str = "My rank is: " + this.rank + " My Suit is: " + realsuit;
    return str;
}

What I've tried so far is:

 public String[] getStats()
{
    String[] dealerstats = this.dealerhand.toArray(new String[this.dealerhand.size()]);
    return dealerstats;
}

and

 public String[] getStats()
{
    String[] dealerstats = {""};
    for(int i = 0; i < this.dealerhand.size(); i++)
    {
        dealerstats[i] = (dealerhand.get(i).showstats());
    }
    return dealerstats;
}

But they both don't work. The end goal would be a string array of the cards in the dealerhand ArrayList, that I will print out using JList. Thanks!

Answer 1

For this:

 public String[] getStats() {
    for(int i = 0; i < this.dealerhand.size(); i++) {
        dealerstats[i] = (dealerhand.get(i).showstats());
    }
    return dealerstats;
}

make sure to initialize your String array, such as below:

 public String[] getStats(Dealer dealer) { // Input a dealer
    String[] dealerstats = new String[dealer.dealerhand.size()]; // Initialize String array
    for(int i = 0; i < this.dealerhand.size(); i++) {
        dealerstats[i] = dealerhand.get(i).showstats();
    }
    return dealerstats;
}

I am also assuming you have a Dealer object, as you seem to reference one in your question.

Answer 2

Your second attempt is almost correct. You created the array but without giving it the correct size. The String[] dealerstats size should be the size of the ArrayList dealerhand :

public String[] getStats()
{
    String[] dealerstats = new String[ dealerhand.size() ];

    for( int i = 0; i < dealerstats.length; ++i )
         dealerstats[i] = dealerhand.get(i).showstats();

    return dealerstats;
}

Answer 3

If you define a toString() method in your Card class you can print the ArrayList out without any conversion ( Live Ideone Example here ):

public class Card{
    ...
    @Override public String toString(){
        return "My rank is: " + this.rank + " My Suit is: " + this.suit;
    }
}

Then you can just use:

List<Card> dealerCards = new ArrayList<Card>();
dealerCards.add(new Card(5, "Hearts"));
dealerCards.add(new Card(10, "Diamonds"));

System.out.println(dealerCards);

---

Output: ["My rank is: 5 My Suit is: Hearts", "My rank is: 10 My Suit is: Diamonds"]