Question

Design a class named StockTransaction that holds a stock symbol (typically one to four characters), stock name, and price per share. Include methods to set and get the values for each data field.

Design an application that declares two StockTransaction objects and sets and displays their values.

Design an application that declares an array of 15 StockTransaction objects. Prompt the user for data for each object, and then display all the values.

Design an application that declares an array of 15 StockTransaction objects. Prompt the user for data for each object, and then pass the array to a method that determines and displays the two stocks with the highest and lowest price per share.

Answer 1

Here is the completed code for this problem. I have attached StockTransaction.java and three applications named Driver1.java, Driver2.java and Driver3.java. Please copy and paste these files SEPARATELY. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// StockTransaction.java

public class StockTransaction {

    // fields

    private String stockSymbol;

    private String stockName;

    private double price_per_share;

    // constructor taking values for all fields

    public StockTransaction(String stockSymbol, String stockName,

             double price_per_share) {

         this.stockSymbol = stockSymbol;

         this.stockName = stockName;

         this.price_per_share = price_per_share;

    }

    // getters and setters

    public String getStockName() {

         return stockName;

    }

    public String getStockSymbol() {

         return stockSymbol;

    }

    public double getPrice_per_share() {

         return price_per_share;

    }

    public void setStockName(String stockName) {

         this.stockName = stockName;

    }

    public void setStockSymbol(String stockSymbol) {

         this.stockSymbol = stockSymbol;

    }

    public void setPrice_per_share(double price_per_share) {

         this.price_per_share = price_per_share;

    }

    // returns a String that will be printed when this object is printed

    public String toString() {

         return "stock symbol=" + stockSymbol + ", stock name=" + stockName

                 + ", price per share=" + price_per_share;

    }

}

// Driver1.java

public class Driver1 {

    public static void main(String[] args) {

         // creating two StockTransaction objects and displaying them

         StockTransaction stock1 = new StockTransaction("GOOG", "Google", 200);

         StockTransaction stock2 = new StockTransaction("NYSE",

                 "New York Stock Exchange", 120);

         System.out.println(stock1); // toSring() method will be invoked

         System.out.println(stock2);

    }

}

// Driver2.java

import java.util.Scanner;

public class Driver2 {

    public static void main(String[] args) {

         // creating an array of 15 StockTransaction objects

         StockTransaction stocks[] = new StockTransaction[15];

         // scanner to read user input

         Scanner scanner = new Scanner(System.in);

         // looping and reading input for all 15 stock objects and creating &

         // adding object to the array

         for (int i = 0; i < stocks.length; i++) {

             System.out.print("Enter stock symbol for stock #" + (i + 1) + ": ");

             String symbol = scanner.nextLine();

             System.out.print("Enter stock name: ");

             String name = scanner.nextLine();

             System.out.print("Enter stock price per share: ");

             double price = Double.parseDouble(scanner.nextLine());

             stocks[i] = new StockTransaction(symbol, name, price);

         }

        

         //displaying all transactions created

         System.out.println("\nStock Transactions:");

         for (StockTransaction stk : stocks) {

             System.out.println(stk);

         }

    }

}

// Driver3.java

import java.util.Scanner;

public class Driver3 {

    // method to find and display the two stocks with highest and lowest price

    // per shares from an array of StockTransactions, assuming the array has no

    // null elements

    static void displayStocksHighestLowest(StockTransaction[] stocks) {

         // initializing both highest and lowest to null

         StockTransaction highest = null, lowest = null;

         // looping through the array

         for (int i = 0; i < stocks.length; i++) {

             // if this is the first element, setting it as both highest and

             // lowest

             if (i == 0) {

                 highest = stocks[i];

                 lowest = stocks[i];

             } else {

                 // if current stock's price is bigger than highest, updating

                 // highest, if it is lower than lowest, setting it as lowest

                 if (stocks[i].getPrice_per_share() > highest

                          .getPrice_per_share()) {

                      highest = stocks[i];

                 }

                 if (stocks[i].getPrice_per_share() < lowest

                          .getPrice_per_share()) {

                      lowest = stocks[i];

                 }

             }

         }

         // displaying both if they are not null

         if (highest != null) {

             System.out

                      .println("Stock with highest price per share: " + highest);

             System.out.println("Stock with lowest price per share: " + lowest);

         }

    }

    public static void main(String[] args) {

         // creating an array of 15 StockTransaction objects

         StockTransaction stocks[] = new StockTransaction[15];

         // scanner to read user input

         Scanner scanner = new Scanner(System.in);

         // looping and reading input for all 15 stock objects and creating &

         // adding object to the array

         for (int i = 0; i < stocks.length; i++) {

             System.out.print("Enter stock symbol for stock #" + (i + 1) + ": ");

             String symbol = scanner.nextLine();

             System.out.print("Enter stock name: ");

             String name = scanner.nextLine();

             System.out.print("Enter stock price per share: ");

             double price = Double.parseDouble(scanner.nextLine());

             stocks[i] = new StockTransaction(symbol, name, price);

         }

         // displaying two stocks with highest and lowest price per shares

         displayStocksHighestLowest(stocks);

    }

}