java - java 中的面向对象编程 ||不知道为什么我的客户名单不打印客户名单

Question

public class CustomerManager {
    private customer[] list;
    private int maxcustomer;
    private int numcustomer;

    public CustomerManager(int size){
        maxcustomer = size;
        numcustomer = 0;
        list = new customer[size];
    }

    //add customer
    public boolean addcustomer(String Address, String Name){
        customer x = new customer(Address, Name);
        if(numcustomer < maxcustomer){
            list[numcustomer] = x;

            return true;
        }
        return false;

    }

1. 列出客户方法未列出客户

2. 我认为这是因为数据没有正确传递给经理，但不确定我哪里出错了

   public String listcustomer(){
       String s = " ";
       int i;
       for(i = 0; i < numcustomer; i++){
           s += list[i].getname();list[i].getaddress();
       }
       return s;
   }
   

   }

Answer 1

您好，欢迎来到 stackoverflow。

一些事情 - 编写 java 时类应以大写字母开头，而变量和函数应以小写字母开头。

其次，当添加新客户时，您必须增加计数器

public boolean addcustomer(String address, String name){
    Customer x = new Customer(address, name);
    if(numcustomer < maxcustomer){
        list[numcustomer] = x;
        numcustomer++;
        return true;
    }
    return false;
}

但我建议将客户存储在 Collection 中，例如 List 或 Set (以防止重复)。然后您不必担心增加计数器，因为您将内置它。

private Set<Customer> customers;

public CustomerManager(int size){
    maxcustomer = size;
    customers = new HashSet();
}

public boolean addcustomer(String address, String name){
    Customer newCustomer = new Customer(address, name);
    if(customers.size() < maxcustomer){
        customers.add(newCustomer)
        return true;
    }
    return false;
}

为了确保 Set 不会存储重复项，您必须正确实现 hashCode 和 equals more info