Question

PUT IN JAVA PROGRAMMING

The Stock class: Design a class named Stock that contains:
• A string data field named symbol1 for the stock’s symbol.
• A string data field named name for the stock’s name.
• A double data field named previousClosingPrice that stores the stock price for the previous day.
• A double data field named currentPrice that stores the stock price for the current time.
• A constructor that creates a stock with the specified symbol and name.
• A method named getChangePercent() that returns the percentage changed from previousClosingPrice to currentPrice.
• Write a test program that creates a Stock object with the stock symbol ORCL, the name Oracle Corporation, and the previous closing price of 34.5. Set a new current price to 34.35 and display the price-change percentage.

Answer 1

Below is your code:

Stock.java

public class Stock {
        // • A string data field named symbol1 for the stock’s symbol.
        private String symbol1;
        // • A string data field named name for the stock’s name.
        private String name;
        // • A double data field named previousClosingPrice that stores the stock
        // price for the previous day.
        private double previousClosingPrice;
        // • A double data field named currentPrice that stores the stock price for
        // the current time.
        private double currentPrice;

        // • A constructor that creates a stock with the specified symbol and name.
        public Stock(String symbol1, String name) {
                this.symbol1 = symbol1;
                this.name = name;
        }

        // A method named getChangePercent() that returns the percentage changed
        // from previousClosingPrice to currentPrice.
        public double getChangePercent() {
                // calculate change
                double change = this.currentPrice - this.previousClosingPrice;
                // calculate percent by dividing change with current price and
                // multiplying with 100
                double percentage = (change / this.currentPrice) * 100;
                return percentage;
        }

        // getter and setters for instance variables
        public String getSymbol1() {
                return symbol1;
        }

        public void setSymbol1(String symbol1) {
                this.symbol1 = symbol1;
        }

        public String getName() {
                return name;
        }

        public void setName(String name) {
                this.name = name;
        }

        public double getPreviousClosingPrice() {
                return previousClosingPrice;
        }

        public void setPreviousClosingPrice(double previousClosingPrice) {
                this.previousClosingPrice = previousClosingPrice;
        }

        public double getCurrentPrice() {
                return currentPrice;
        }

        public void setCurrentPrice(double currentPrice) {
                this.currentPrice = currentPrice;
        }

}

StockDriver.java

public class StockDriver {
        // main method declaration
        public static void main(String[] args) {
                // create stock object
                Stock stock = new Stock("ORCL", "Oracle Corporation");
                // set previous closing price
                stock.setPreviousClosingPrice(34.5);
                // set current price
                stock.setCurrentPrice(34.35);
                // get percentage
                double percentage = stock.getChangePercent();
                // print result
                if (percentage < 0) {
                        System.out.println("Price decreased by " + (-percentage) + "%.");
                } else {
                        System.out.println("Price increased by " + (percentage) + "%.");
                }
        }
}

Output

Price decreased by 0.4366812227074194%.