Question

我不确定哪种方法不起作用。当我从addSavingsAccount创建帐户时，一切正常，但是当我想打印出来自两个类的信息时，它会输出name和pNr，但会显示所有客户端的第一个帐号。这有什么问题？

//this works fine
public int addSavingsAccount(long pNr){ 

    for(int i = 0; i < customerlist.size(); i++)
    {
        if(customerlist.get(i).getPCode() == pNr)
        {
            Customer customer = customerlist.get(i);
            customer.addAccount(pNr);
            return account.getAccountId();
        }
    }
    return -1;
}


//but this don't
public String infoAccount(long pNr, int accountId)
{
    String info = "";
    for(Customer customer : customerlist) {
          if(customer.getPCode() == pNr) {
            this.customer = customer;
            ArrayList<SavingsAccount> accounts = customer.getAccount();
            for (SavingsAccount account : accounts) {
              this.account = account;
              if (account.getAccountId() == accountId){
                info = account.toString();
            }
            }
        }
     } 
    return info;
}

//this was my first try of printing out:
public String infoAccount(long pNr, int accountId)
{
    String info = "";
    for(Customer customer : customerlist)
    {
        if(pNr == customer.getPCode())
        {
            for(SavingsAccount account : accounts)
            {
                if(accountId == account.getAccountId())
                {
                    info = "Personnummer: " + pNr + "\nKontonummer: " + accountId
                    + "\nSaldo: " + amount + "\nRänta: " + SavingsAccount.RATE;
                }
            }
        } 
    }
    return info; 
}


//the methods in Customerclass
public void addAccount(long pNr){
    accounts.add(new SavingsAccount());
}

public ArrayList<SavingsAccount> getAccount(){
    return accounts;
}


//methods from SavingsAccount
public int getAccountId(){
    return accountCount++;
}

public String toString(){
    String infoAccount = "\tKontonr: " + accountId + "\tKontotyp: " + accounttype +
    "\nSaldo: " + balance + "\tRäntesats: " + RATE;
    return infoAccount;
}

Answer 1

我不确定我是否看到了足够的代码，但您似乎正在尝试进行设置，以便每个account都有一个帐户ID。但是，您的getAccountId方法在每次调用时都会返回不同的值，即使在同一SavingsAccount上调用时也是如此，因为每次调用时它都会递增一个计数器调用。

您需要做的是在accountId中声明SavingsAccount之类的实例成员，并在创建新的SavingsAccount时设置它：

accountId = accountCount++;

是您唯一想要使用++的地方。然后，getAccountId()将返回实例成员，而不会增加任何内容。

通过在java中调用两个类来创建方法

1 个答案: