constructors.java

public class DailyPrice {

    private String dailyDate;
    private double dailyOpen;
    private double dailyHigh;
    private double dailyLow;
    private double dailyClose;
    private int dailyVolume;

    public DailyPrice(String dailyDate, double dailyOpen, double dailyHigh, double dailyLow, double dailyClose, int dailyVolume) {
        this.dailyDate = dailyDate;
        this.dailyOpen = dailyOpen;
        this.dailyHigh = dailyHigh;
        this.dailyLow = dailyLow;
        this.dailyClose = dailyClose;
        this.dailyVolume = dailyVolume;
    }
}

public class Company {

    private String companySymbol;
    private ArrayList<DailyPrice> companyStockPrices;

    public Company(String companySymbol, ArrayList<DailyPrice> companyStockPrices) {
        this.companySymbol = companySymbol;
        this.companyStockPrices = companyStockPrices;
    }
}

public class Companies {

    private ArrayList<Company> listedCompanies;

    public Companies(ArrayList<Company> listedCompanies) {
        this.listedCompanies = listedCompanies;
    }
}