Writing a method that lets an arraylist accept and store objects

Question

I'm writing a class and I need to write a class where the arraylist accept and stores an object of its type. I know this is probably extremely simple but I'm running on no sleep. Here is my Stock Manager class

public class StockManager {

private String appleStocks;
private ArrayList<StockRecord> myList;

public StockManager(String appleStocks) {
    this.appleStocks = appleStocks;
    this.myList = new ArrayList<StockRecord>();
}

public void addStock() {
    for (StockRecord aRecord : this.myList) {
        this.myList.add(aRecord);
    }
}

If you need to see my other class I can supply it but I don't think it would be necessary

Answer 1

What you are doing is reading over the list and adding each element back. Try this instead. get a new element as method argument and add to the list

public void addStock(StockRecord stock) {
    myList.add(stock);
}

Answer 2

public void addStock(StockRecord record) 
{
    if(record != null)
    {
            this.myList.add(record);
    }
}

Just pass a stock record to the class and add it from the inside. If it's null then it will skip the if statement. Easy.