从调用Java中的两个类创建方法 [英] Creating a method from calling two classes in java

问题描述

我不知道其中的我的方法是不工作的。当我创建addSavingsAccount账户的一切工作正常，但是当我想从两个类打印出来的信息它打印的姓名和PNR，但显示了第一ACCOUNTNUMBER到所有客户端。这有什么错呢？

  //这工作正常
公众诠释addSavingsAccount（长PNR）{    的for（int i = 0; I＆LT; customerlist.size（）;我++）
    {
        如果（customerlist.get（I）.getP code（）== PNR）
        {
            客户客户= customerlist.get（I）
            customer.addAccount（PNR）;
            返回account.getAccountId（）;
        }
    }
    返回-1;
}
//但是这不
公共字符串infoAccount（PNR长，诠释帐户ID）
{
    字符串信息=;
    对于（客户的客户：customerlist）{
          如果（customer.getP code（）== PNR）{
            this.customer =客户;
            ArrayList的＆LT; SavingsAccount＆GT;帐户= customer.getAccount（）;
            对于（SavingsAccount账户：账户）{
              this.account =账户;
              如果（account.getAccountId（）==帐户ID）{
                信息= account.toString（）;
            }
            }
        }
     }
    返回信息;
}//这是我打印出的第一次尝试：
公共字符串infoAccount（PNR长，诠释帐户ID）
{
    字符串信息=;
    对于（客户的客户：customerlist）
    {
        如果（PNR == customer.getP code（））
        {
            对于（SavingsAccount账户：账户）
            {
                如果（帐户== account.getAccountId（））
                {
                    信息=Personnummer：+ PNR +\\ nKontonummer：+帐户ID
                    +\\ nSaldo：+量+\
Ränta：+ SavingsAccount.RATE;
                }
            }
        }
    }
    返回信息;
}
//在Customerclass方法
公共无效addAccount（长PNR）{
    accounts.add（新SavingsAccount（））;
}公众的ArrayList＆LT; SavingsAccount＆GT;是getAccount（）{
    返回账户;
}
//从SavingsAccount方法
公众诠释getAccountId（）{
    返回accountCount ++;
}公共字符串的toString（）{
    字符串infoAccount =\\ tKontonr：+帐户ID +\\ tKontotyp：+ ACCOUNTTYPE +
    \\ nSaldo：+余额+\\tRäntesats：+率;
    返回infoAccount;
}
 

解决方案

我不知道我看到足够code，但它看起来像你想设置的东西，让每个帐户有一个帐户ID。然而，你的 getAccountId 方法是要在每次被称为时间返回不同的值，即使在呼吁同 SavingsAccount ，因为它每次都会增加一个计数器，它被称为

您需要做的是声明实例成员，如帐户ID 在 SavingsAccount ，并设置它当一个新的 SavingsAccount 创建

 帐户ID = accountCount ++;
 

这是您要使用 ++ 的唯一地方。然后， getAccountId（）将返回实例成员，不增加任何东西。

I'm not sure which one of my methods that's not working. When i create accounts from addSavingsAccount everything is working fine, but when I want to print out the info from two classes it prints name and pNr but shows the first accountnumber to all clients. What's wrong with this?

//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;
}

解决方案

I am not sure I see enough code, but it looks like you're trying to set things up so that each account has an account ID. However, your getAccountId method is going to return a different value each time it's called, even when called on the same SavingsAccount, because it will increment a counter each time it's called.

What you need to do is to declare an instance member such as accountId in the SavingsAccount, and set it when a new SavingsAccount is created:

accountId = accountCount++;

That is the only place you want to use the ++. Then, getAccountId() would return the instance member, without incrementing anything.

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