Question

我目前正在为更大的OOP项目开发setHousePrice（）方法。但是，该程序的行为并不像我预期的那样。所有值都存储在变量housePrice中，但在我看来，每次存储新值时，它都会覆盖以前的值。

我的问题是，如何更改代码以将多个房价存储到单个变量中（如果可能）？有没有办法在不使用数组或集合的情况下执行此操作？

这是类代码：

import java.util.Scanner;

public class BuyAHouseInc2
{
private int houseCounter;
private int amountOfHouses;
private int housePrice;

// method that sets the house price
    public void setHousePrice()
    {
        System.out.println("\n--------------------");
        System.out.println("Set House Prices");
        System.out.println("--------------------");

        houseCounter = 1;
        do
        {
            System.out.print("\nPlease enter the price of house " + houseCounter + ": " + "€");
            Scanner input = new Scanner(System.in);
            housePrice = input.nextInt();

                if(housePrice > 0)
                {
                    this.housePrice = housePrice;
                    houseCounter++;
                }
                else 
                {
                    System.out.println("Enter a valid house price...");
                }

        }
        while(houseCounter <= amountOfHouses);
    }
}

这是测试人员代码：

public class BuyAHouseIncTester2
{
    public static void main(String args[])
    {
    // client 1 details
    BuyAHouseInc2 client1 = new BuyAHouseInc2 ("John","Doyle","15 Newton Drive\nDublin 5\n", 550000)

    // set house price for each of the houses added to database
    client1.setHousePrice();
    }
}

这是在终端中运行：

Answer 1

是的，这是真的。您只需将一个变量存储在不同房屋的价格中。

我建议做一些改变：

创建一个类House。它包含您可能需要的价格和其他信息。
创建Houses的ArrayList。在这种情况下，ArrayList的大小是房屋的数量，你可以通过遍历它来获得每个房屋。

让我们谈谈代码：

public class House
{
    int housePrice = 0;

    void setPrice(int price)
    {
        housePrice = price; //You've checked before
    }
}

和

import java.util.Scanner;

public class BuyAHouseInc2
{
    private int amountOfHouses;
    private ArrayList<House> houses;

    public BuyAHouseInc2(int amountOfHouses)
    {
        this.amountOfHouses = amountOfHouses;
        houses = new ArrayList<>(amountOfHouses);
    }

    // method that sets the house price
        public void setHousePrice()
        {
            System.out.println("\n--------------------");
            System.out.println("Set House Prices");
            System.out.println("--------------------");

            int houseCounter = 0;
            do
            {
                System.out.print("\nPlease enter the price of house " + houseCounter + ": " + "€");
                Scanner input = new Scanner(System.in);
                int housePrice = input.nextInt();

                    if(housePrice > 0)
                    {
                        House h = new House();
                        h.setPrice(housePrice);
                        houses.add(h);
                        houseCounter++;
                    }
                    else 
                    {
                        System.out.println("Enter a valid house price...");
                    }

            }
            while(houseCounter < amountOfHouses);
        }
}

Answer 2

首先，您需要创建应用程序的新设计。

例如，创建类House：

public class House {
    private int numberOfHouse;
    private int housePrice;
}

之后阅读Arrays和Collections

将多个值存储到变量中（不使用集合或数组）

2 个答案: