Java销售方法股票类

这是我的家庭作业

我想写一个方法，允许一些股票以给定的价格出售。该方法采用两个参数：股票数量作为整数，每股价格作为双精度。该方法返回一个布尔值，以指示销售是否成功。例如：

// myStock now has 30 shares at total cost $90.00
boolean success = myStock.sell(5, 4.00);
// sells 5 shares at $4.00 successfully
// myStock now has 25 shares at total cost $70.00
success = myStock.sell(2, 5.00);
// sells 2 shares at $5.00 successfully
// myStock now has 23 shares at total cost $60.00  

My Code :

public static void buy(int numBuyShares, double priceBuyShares)
{
double tempTotalCost = ((double)numBuyShares * priceBuyShares);
totalShares += numBuyShares;
totalCost += priceBuyShares;

}
public static void sell(int numSellShares, double priceSellShares) 
{

 ?????
}

---

1.）我如何使用之前的买入股票和成本减去卖出股票和价格

我想象你想要这样的东西

public static boolean sell(int numSellShares, double priceSellShares) {
    double sellCost = numSellShares * priceSellShares; // calculate total $
                                                        // to sell

    // assure 2 things:
    // shares to sell does not exceed total # of shares; and
    // total $ to sell does not exceed total cost
    if (numSellShares <= totalShares && sellCost <= totalCost) {
        // subtract #shares and cost from total
        totalShares -= numSellShares;
        totalCost -= sellCost;
        return true; // return success
    }
    // tried to sell more shares or $ than what exists
    else {
        return false; // return failure
    }
}

publicstaticbooleansell（整数numSellShares，双倍价格sellshares）{
double sellCost=numSellShares*priceSellShares；//计算总数$
//出售
//确保两件事：
//出售的股份不超过股份总数；以及
//要出售的总美元不超过总成本
如果（numSellShares
totalShares-=numBuyShares；
？你做过任何尝试吗？现在看起来你的问题没有比你之前的问题更多。如果每股价格可以改变，为什么要存储所有股票的总成本？我的错。我正在编写一个多线程类程序。我需要做一个买入方法，卖出方法和利润方法。两种方法的价格和份额将在线程类中随机生成。