คลาสจำลองหุ้นและคำนวณการเปลี่ยนแปลงราคา

public class StockDriver {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String symbol = sc.nextLine();
        String name = sc.nextLine();
        Stock s = new Stock(symbol, name);
        double previousPrice = sc.nextDouble();
        double currentPrice = sc.nextDouble();
        s.setPreviousClosingPrice(previousPrice);
        s.setCurrentPrice(currentPrice);
        System.out.println("Stock name: " + s.name);
        System.out.println("Stock symbol: " + s.symbol);
        System.out.printf("Price-change percentage: %.2f%%", s.getChangePercent());
    }
}
 
class Stock {
    // Write your code here
 
    // Constructor - DO NOT CHANGE HERE
    Stock(String newSymbol, String newName){
        symbol = newSymbol;
        name = newName;
    }
 
    // Write your code here
 
}

import java.util.Scanner;
 
public class StockDriver {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String symbol = sc.nextLine();
        String name = sc.nextLine();
        Stock s = new Stock(symbol, name);
        double previousPrice = sc.nextDouble();
        double currentPrice = sc.nextDouble();
        s.setPreviousClosingPrice(previousPrice);
        s.setCurrentPrice(currentPrice);
        System.out.println("Stock name: " + s.name);
        System.out.println("Stock symbol: " + s.symbol);
        System.out.printf("Price-change percentage: %.2f%%", s.getChangePercent());
    }
}
 
class Stock {
    String symbol;
    String name;
    double previousClosingPrice;
    double currentPrice;
 
    // Constructor - DO NOT CHANGE HERE
    Stock(String newSymbol, String newName){
        symbol = newSymbol;
        name = newName;
    }
 
    double getChangePercent() {
        return ((currentPrice - previousClosingPrice) / previousClosingPrice) * 100;
    }
 
    void setPreviousClosingPrice(double oldPrice) {
        previousClosingPrice = oldPrice;
    }
 
    void setCurrentPrice(double newPrice) {
        currentPrice = newPrice;
    }
 
}

String symbol;
String name;
double previousClosingPrice;
double currentPrice;

Stock(String newSymbol, String newName){
    symbol = newSymbol;
    name = newName;
}

double getChangePercent() {
    return ((currentPrice - previousClosingPrice) / previousClosingPrice) * 100;
}

void setPreviousClosingPrice(double oldPrice) {
    previousClosingPrice = oldPrice;
}

void setCurrentPrice(double newPrice) {
    currentPrice = newPrice;
}