// package classes;

public class Stock {

	private String symbol;
	private int totalShares;
	private double totalCost;

	// initializes a new Stock with no shares purchased
	public Stock(String symbol) {
		this.symbol = symbol;
		totalShares = 0;
		totalCost = 0.0;
	}

	// crate constructor to set total shares and total cost
	public Stock(String symbol, int totalShares, int totalCost) {
		this.totalCost = totalCost;
		this.totalShares = totalShares;
		this.symbol = symbol;
	}
	
	// returns the total profit or loss earned on this stock
	public double getProfit(double currentPrice) {
		double marketValue = totalShares * currentPrice;
		return marketValue - totalCost;
	}

	// records purchase of the given shares at the given price
	public void purchase(int shares, double pricePerShare) {
		totalShares += shares;
		totalCost += shares * pricePerShare;
	}
	
	// implemnting the clear method
	// by calling this method on stock object it'll set total shares and cost to zero
	public void clear() {
		this.totalShares = 0;
		this.totalCost = 0;
		 
	}
	
	public static void main(String args[]) {
		Stock stock = new Stock("bull",430,43000);
		System.out.println("total stocks and price before calling clear method:  " +stock.totalShares+ ", " +stock.totalCost);
		stock.clear();
		System.out.println("total stocks and price after calling clear method:  " +stock.totalShares+ ", " +stock.totalCost);
	}
}

Output:

total stocks and price before calling clear method:  430, 43000.0
total stocks and price after calling clear method:  0, 0.0