Arraylist of classes

Question

I have a main class that has auxiliary classes as attributes.

Example: Main class MoedasList:

public class MoedasList {
    public USD USD;
    public USDT USDT;
    public ARS ARS;
}

Each attribute is an auxiliary class with its individual attributes.

Example: Auxiliary class USD:

public class USD {
    public String code;           //": "BRL",
    public String codein;         //": "BRL",
    public String name;           //": "Dólar Comercial",
    public String high;           //": "3,9766",
    public String low;            //": "3,9748",
    public String varBid;         //": "0,0021",
    public String pctChange;      //: "0,05",
    public String bid;            //": "3,9765",
    public String ask;            //": "3,9767",
    public String timestamp;      //": "1557873008",
    public String create_date;    //": "2019-05-14 21:00:05"
}

How I ride one ArrayList of the main class MoedasList?

I assembled the class this way to receive the data from a JSON.

I get the normal data, but now I’d like to assemble a ArrayList.

Answer 1

If the ArrayList is of class MoedasList, you can do

MoedasList[] moedas = new MoedasList[n];

where n is the number of items on the list.

Then you need to start the objects of this class.

moedas[0] = new MoedasList();

If you want to start all the objects in the list, you can do

for (int i = 0; i < moedas.length; i++){
    moedas[i] = new MoedasList();
}