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Tuesday, 30 August 2016

Chapter 9 Exercise 2, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

9.2 (The Stock class) Following the example of the Circle class in Section  9.2,
design a class named Stock that contains:

  • A string data field named symbol 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 .

Draw the UML diagram for the class and then implement the class. 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


public class Stock {

    private String symbol;
    private String name;

    private double previousClosingPrice;
    private double currentPrice;

    public Stock(String symbol, String name) {
        this.symbol = symbol;
        this.name = name;
    }

    public String getSymbol() {
        return symbol;
    }

    public void setSymbol(String symbol) {
        this.symbol = symbol;
    }

    public String getName() {
        return name;
    }

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

    public double getCurrentPrice() {
        return currentPrice;
    }

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

    public double getPreviousClosingPrice() {
        return previousClosingPrice;
    }

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

    public double getChangePercent() {
        return (currentPrice - previousClosingPrice) / previousClosingPrice;
    }
}


public class Exercise_02 {

    public static void main(String[] args) {

        Stock stock1 = new Stock("ORCL", "Oracle Corporation");
        stock1.setCurrentPrice(34.5);
        stock1.setCurrentPrice(34.35);
        System.out.println("Stock name: " + stock1.getName() + " Symbol: " + stock1.getSymbol());
        System.out.println("previous price: " + stock1.getPreviousClosingPrice());
        System.out.println("current price: " + stock1.getCurrentPrice());
        System.out.println("Percent changed: " + stock1.getChangePercent());

    }
}

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