How do I add an object to an arraylist within an arraylist of objects?

Question

I have a class to represent a player hand. However I have (in another class) an arraylist where I want to represent a bunch of playerhands. The problem is that I don't know how to add a card to the hand within the arraylist of many hands. I have a class representing both cards and a deck, which works well. I am just trying to understand how to add an object to an object within an arraylist. Thank you!

public class Hand{ 

ArrayList<Cards> hand;
public Hand(){
hand = new ArrayList<Cards>();}

public Class Pile{
ArrayList<Hand> = pile;

public Pile{
pile = new ArrayList<Hand>();
for(int i=0; i<5; i++){ pile.add(new Hand()); }
}

public void addToPile(int index, int position, Card card){
 pile.add(index, pile.get(i).add(Card));
}

Possible duplicate of How do i create a list of Objects in Java — kostas poimenidhs
– kostas poimenidhs, Commented Jan 19, 2019 at 11:46
Are you sure you want an ArrayList of player hands, wouldn’t it be better with a Map where the key identifies the player? — Joakim Danielson
– Joakim Danielson, Commented Jan 19, 2019 at 11:59

Mehrbod Khiabani · Accepted Answer · 2019-01-19 11:43:00Z

1

I guess you have an ArrayList like this:

ArrayList<Hand> hands = new ArrayList<>();

First you have to find your item's index -lets call it i- within hands. Then you can get your item from that list like this and put it into another variable. Hand myHand = hands.get(i); Then you can perform your add operation on myHand variable. Also, you can add a method to your class which takes a card and adds that card to the list of cards(hand).

myHand.addCard(card);

answered Jan 19, 2019 at 11:43

Mehrbod Khiabani

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