This program uses the StockHolding class that we wrote in the lab for Writing Cl

Question

This program uses the StockHolding class that we wrote in the lab for Writing Classes.

Write a class PortfolioList. A PortfolioList object maintains a portfolio of StockHolding objects by using ArrayList<StockHolding>

PortfolioList only has a no-argument constructor

public class PortfolioDriver {

public static void main(String[] args) {

StockHolding apple = new StockHolding("AAPL", 19, 103.97);

StockHolding ibm = new StockHolding("IBM", 10, 160.8);

StockHolding oracle = new StockHolding("ORCL", 25, 40.76);

StockHolding amazon = new StockHolding("AMZN", 22, 748.27);

PortfolioList pl1 = new PortfolioList();

PortfolioList pl2 = new PortfolioList();

pl1.add(apple);

pl1.add(ibm);

pl2.add(ibm);

pl2.add(oracle);

pl2.add(amazon);

pl2.add(apple);

System.out.println("portfolio 1: " + pl1.toString());

System.out.println("portfolio 2: " + pl2.toString());

System.out.println("Amazon: " + pl2.find("AMZN").toString());

pl2.remove("AMZN");

pl2.remove("AAPL");

pl2.remove("IBM");

pl2.remove("ORCL");

System.out.println("portfolio 2: " + pl2.toString());

}

}

Explanation / Answer

HI FRiend, you have not posted StockHolding class. So I can not test.

public class PortfolioList{

   private ArrayList<StockHolding> stockList;

   public PortfolioList(){

       stockList = new ArrayList<>();

   }

   void add(StockHolding stock){ // adds the given StockHolding to the portfolio

       stockList.add(stock);

   }

   void remove(String ticker){ // removes the StockHolding with the given ticker from the portfolio

       int index = -1;

       for(int i=0; i<stockList.size(); i++)

           if(ticker.equalsIgnoreCase(stockList.get(i).getTicker())){

               index = i;

               break;

           }

       if(index != -1)

           stockList.remove(index);

   }

   StockHolding find(String ticker){ // returns a reference to the portfolio element having the given ticker.

       //The method should return null if there is no such element

       int index = -1;

       for(int i=0; i<stockList.size(); i++)

           if(ticker.equalsIgnoreCase(stockList.get(i).getTicker())){

               return stockList.get(i);

           }

       return null;

   }

   String toString(){ // returns a string containing the toString values of each element

       //separated by newline characters ( )

       String result = "";

       for(StockHolding stock : stockList)

           result = result + stock.toString()+" ";

   }

}

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