How to update a specific value in List<Class>?

May 14, 2022

I need to update one data in my List<Cards>. Class Cards looks like this:

public class Cards implements Comparable<Cards>{
private int cardImage, cardID, cardScore;

public Cards(int cardImage, int cardID, int cardScore){
    this.cardImage = cardImage;
    this.cardID = cardID;
    this.cardScore = cardScore;
}
public int getImage(){
    return cardImage;
}
public int getId(){
    return cardID;
}
public int getScore(){return cardScore;}

@Override
public int compareTo(Cards o) {
    return this.cardID > o.cardID ? 1 : (this.cardID < o.cardID ? -1 : 0);
}

In my MainActivity clas I initiated List cardsList = new ArrayList<>(); and filled it like this

                for (i = 0; i < lvl; i++) {
                cardsList.add(new Cards(Constants.imageNumber[drawCard[i]], drawId[i], cardScore[i]));
            }

Now I want to update values only for cardScore[i]. How can I do this?

>Solution :

Create setters for your Cards class, then you can call those setters after using List#get to get the card at a specific index.

public class Cards implements Comparable<Cards>{
    // other methods omitted for brevity...
    public void setCardScore(int cardScore){
        this.cardScore = cardScore;
    }
}
// Usage:
cardsList.get(i).setCardScore(newCardScore);