java - 如何给数组中的对象赋值？

Question

软件包第10章；

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

public class Customer {
    private String name;
    private  String streetAddress;   
    private  String phoneNumber;
    private  int total;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }      

    public  String getStreetAddress(){
        return streetAddress;
    }

    public void setStreetAddress(String streetAddress) {
        this.streetAddress = streetAddress;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }



    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public int getTotal(){  
        return total;       
    }

    public void setTotal(int total){
        this.total = total; 
    }

    public static void assign(){
        int a = (int) (Math.random() + 10); 
        int r = (int) (Math.random() + 10); 
        int f = (int) (Math.random() + 10); 
        System.out.println(a + r + f + "x" + "x" + "x");
    }

    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        ArrayList <Customer > customerList = new ArrayList <Customer>();
        char ans;
        do
        {
            Customer customer = new Customer(); 
            System.out.print("Customer name ");
            customer.setName(in.next());
int i = 0;
++i;
            System.out.print("Street Address ");
            customer.setStreetAddress(in.next());

            System.out.print("Phone Number ");
            customer.setPhoneNumber(in.next());

            customerList.add(customer);
            System.out.println("Enter total sales ");
            customer.setTotal(in.nextInt());

            System.out.println("Would you like to enter in a new customer       (    y/n)? ");
            String answer = in.next();
            ans = answer.charAt(0);
           ((String) customerList).concat("")

        } while(ans == 'y');

        for(Customer c: customerList){
            System.out.print(c.getName() + "\n" + "Phone number is         "            +c    .getPhoneNumber() +"\n" + "Total sales is "+ c.getTotal() + "\n" + "Address       is"+ c.getStreetAddress());

        }

        for(int i=0; i<customerList.size(); i++){
            //System.out.print(customerList.get(i).getName());
        }
    }
}

我需要为数组列表中的每个值分配一个数字，但收到一条错误，提示我必须转换为字符串(数组列表)。如何添加？

Answer 1

如果我从评论中收集到的信息是正确的，那么我相信这就是您想要的:

如果您想要随机值 1-10，则当前的 allocate() 是不正确的，它应该如下所示:

public String assign(){
    Random rand = new Random();
    int a = rand.nextInt(10) + 1;
    int r = rand.nextInt(10) + 1;
    int f = rand.nextInt(10) + 1;
    return a+r+f+"xxx";
}

客户将如下所示:

public class Customer {
    private String name;
    private String customerNumber;
    private  String streetAddress;   
    private  String phoneNumber;
    private  int total;
    ...
    ...
    ...
    public String getCustomerNumber() { return this.customerNumber; }
    public void setCustomerNumber(String cNumber) { this.customerNumber = cNumber; }

分配数字应该如下所示:

    for(Customer c : customerList) {
        c.setCustomerNumber(assign());
    }

还要避免这行代码，这是一个非常糟糕的主意:

    ((String) customerList).concat("")

您或许应该将 customerNumber 重命名为 customerID。