Question

我正在尝试创建一种类型的多个对象。然后我想将这些值传输到数组列表中。如何使用具有不同名称的while循环创建对象。例如，这里是我的代码，但它只会生成一个名称的对象。

Customer cust = new Customer("bob", 20.0);

和我的构造函数，如果你想看到：

public Customer(String customerName, double amount)
{
    String name=customerName;
    double sale=amount;
}

StoreTest类（使用main方法）：

import java.util.ArrayList;
import java.util.Scanner;

public class StoreTest {

ArrayList<Customer> store = new ArrayList<Customer>();

public static void main (String[] args)
{
        double sale=1.0; //so the loop goes the first time
        //switch to dowhile
        Scanner input = new Scanner(System.in);

        System.out.println("If at anytime you wish to exit" +
                ", please press 0 when asked to give " +
                "sale amount.");
        while(sale!=0)
        {
            System.out.println("Please enter the " +
                    "customer's name.");
            String theirName = input.nextLine();

            System.out.println("Please enter the " +
                    "the amount of the sale.");
            double theirSale = input.nextDouble();

            store.addSale(theirName, theirSale);
        }
        store.nameOfBestCustomer();
}

}

客户类：

public class Customer {

private String name;
private double sale;

public Customer()
{

}

public Customer(String customerName, double amount)
{
    name=customerName;
    sale=amount;
}
}

商店类（有使用arraylist的方法：

import java.util.ArrayList;


public class Store {

//creates Customer object and adds it to the array list
public void addSale(String customerName, double amount)
{
    this.add(new Customer(customerName, amount));
}

//displays name of the customer with the highest sale
public String nameOfBestCustomer()
{
    for(int i=0; i<this.size(); i++)
    {

    }
}
}

Answer 1

ArrayList<Customer> custArr = new ArrayList<Customer>();
while(youWantToContinue) {
    //get a customerName
    //get an amount
    custArr.add(new Customer(customerName, amount);
}

要实现这一点......你必须修复你的构造函数......

假设您的Customer类包含名为name和sale的变量，您的构造函数应如下所示：

public Customer(String customerName, double amount) {
    name = customerName;
    sale = amount;
}

将您的Store课程改为更类似的内容：

public class Store {

    private ArrayList<Customer> custArr;

    public new Store() {
        custArr = new ArrayList<Customer>();
    }

    public void addSale(String customerName, double amount) {
        custArr.add(new Customer(customerName, amount));
    }

    public Customer getSaleAtIndex(int index) {
        return custArr.get(index);
    }

    //or if you want the entire ArrayList:
    public ArrayList getCustArr() {
        return custArr;
    }
}

Answer 2

您可以使用此代码......

public class Main {

    public static void main(String args[]) {
        String[] names = {"First", "Second", "Third"};//You Can Add More Names
        double[] amount = {20.0, 30.0, 40.0};//You Can Add More Amount
        List<Customer> customers = new ArrayList<Customer>();
        int i = 0;
        while (i < names.length) {
            customers.add(new Customer(names[i], amount[i]));
            i++;
        }
    }
}

在循环中创建具有不同名称的多个对象以存储在数组列表中

2 个答案: