Question

分配：更改帐户类，以便可以将资金从一个帐户移动到另一个帐户。可以认为这是从一个账户中提取资金并将其存入另一个账户。更改Banking类的主要方法以显示此新服务。

我正在开设银行账户类，可以从银行账户余额中存取款。我正在处理分配的类部分，您声明驱动程序的所有方法。我的任务要求我制定一种方法，从一个帐户中提取资金并将这笔钱存入另一个帐户。我已经知道如何提款和存款，我只是不知道如何将钱从一个账户转到另一个账户。这是我到目前为止传输方法的代码：

import java.text.NumberFormat;
public class Account
{
    private NumberFormat fmt = NumberFormat.getCurrencyInstance();
    private final double RATE = 0.035; // interest rate of 3.5%
    private long acctNumber;
    private double balance;
    private String name;
    //-----------------------------------------------------------------
    // Sets up the account by defining its owner, account number,
    // and initial balance.
    //-----------------------------------------------------------------
    public Account (String owner, long account, double initial)
    {
        name = owner;
        acctNumber = account;
        balance = initial;
    }
    //-----------------------------------------------------------------
    // Validates the transaction, then deposits the specified amount
    // into the account. Returns the new balance.
    //-----------------------------------------------------------------
    public double deposit (double amount)
    {
        if (amount < 0) // deposit value is negative
        {
            System.out.println ();
            System.out.println ("Error: Deposit amount is invalid.");
            System.out.println (acctNumber + " " + fmt.format(amount));
        }
        else
            balance = balance + amount;
        return balance;
    }
    //-----------------------------------------------------------------
    // Validates the transaction, then withdraws the specified amount
    // from the account. Returns the new balance.
    //-----------------------------------------------------------------
    public double withdraw (double amount, double fee)
    {
        amount += fee;
        if (amount < 0) // withdraw value is negative
        {
        System.out.println ();
        System.out.println ("Error: Withdraw amount is invalid.");
        System.out.println ("Account: " + acctNumber);
        System.out.println ("Requested: " + fmt.format(amount));
        }
        else
        if (amount > balance) // withdraw value exceeds balance
        {
        System.out.println ();
        System.out.println ("Error: Insufficient funds.");
        System.out.println ("Account: " + acctNumber);
        System.out.println ("Requested: " + fmt.format(amount));
        System.out.println ("Available: " + fmt.format(balance));
        }
        else
        balance = balance - amount;
        return balance;
    }

    public double transfer (double amount, double fee)
    {
        amount += fee;
        if (amount < 0) // withdraw value is negative
        {
            System.out.println ();
            System.out.println ("Error: Withdraw amount is invalid.");
            System.out.println ("Account: " + acctNumber);
            System.out.println ("Requested: " + fmt.format(amount));
        }
        else
        if (amount > balance) // withdraw value exceeds balance
        {
            System.out.println ();
            System.out.println ("Error: Insufficient funds.");
            System.out.println ("Account: " + acctNumber);
            System.out.println ("Requested: " + fmt.format(amount));
            System.out.println ("Available: " + fmt.format(balance));
        }
        else
            balance = balance - amount;

         //What should I put here to deposit the amount into another account?

        if (amount < 0) // deposit value is negative
        {
            System.out.println ();
            System.out.println ("Error: Deposit amount is invalid.");
            System.out.println (acctNumber + " " + fmt.format(amount));
        }
        else
            balance = balance + amount;
    }

    //-----------------------------------------------------------------
    // Adds interest to the account and returns the new balance.
    //-----------------------------------------------------------------
    public double addInterest ()
    {
        balance += (balance * RATE);
        return balance;
    }
    //-----------------------------------------------------------------
    // Returns the current balance of the account.
    //-----------------------------------------------------------------
    public double getBalance ()
    {
        return balance;
    }
    //-----------------------------------------------------------------
    // Returns the account number.
    //-----------------------------------------------------------------
    public long getAccountNumber ()
    {
        return acctNumber;
    }
    //-----------------------------------------------------------------
    // Returns a one-line description of the account as a string.
    //-----------------------------------------------------------------
    public String toString ()
    {
        return (acctNumber + "\t" + name + "\t" + fmt.format(balance));
    }
}

Answer 1

您的转帐方式没有任何意义。 Tranfer应该是主类中实例化帐户的方法。转移的例子是。

public static void main(String[] args)
{
    // This creates two different accounts :)
    Account a = new Account("userA", 123, 200);
    Account b = new Account("userB", 234, 500);

    // Tranfer
    a.withdraw(100, 5);
    System.out.println(a.getBalance());
    b.deposit(100);
    System.out.println(b.getBalance());
}

并将其转换为方法

public static void transfer (Account from, Account to, double amount, double fee)
{
    from.withdraw(amount, fee);
    to.deposit(amount);
}

修改

如果我理解你的第二个问题，你想创建一个默认帐户吗？如果我误解了，你能提供更多细节吗？（链接到作业或其他东西）

你需要为它编写6种新方法，你还没有它们，

getOwner

setOwner

getAcctNumber

setAcctNumber

为getBalance

的setBalance

帐户CLass

import java.text.NumberFormat; public class Account { private NumberFormat fmt = NumberFormat.getCurrencyInstance(); private final double RATE = 0.035; // interest rate of 3.5% private long acctNumber; private double balance; private String name; //----------------------------------------------------------------- // Sets up the account by defining its owner, account number, // and initial balance. //----------------------------------------------------------------- public Account (String owner, long account, double initial) { name = owner; acctNumber = account; balance = initial; } public Account() { // This would be the default constructor and default account name ="N/A"; acctNumber = 0; balance = 0.0; } //----------------------------------------------------------------- // Validates the transaction, then deposits the specified amount // into the account. Returns the new balance. //----------------------------------------------------------------- public double deposit (double amount) { if (amount < 0) // deposit value is negative { System.out.println (); System.out.println ("Error: Deposit amount is invalid."); System.out.println (acctNumber + " " + fmt.format(amount)); } else balance = balance + amount; return balance; } //----------------------------------------------------------------- // Validates the transaction, then withdraws the specified amount // from the account. Returns the new balance. //----------------------------------------------------------------- public double withdraw (double amount, double fee) { amount += fee; if (amount < 0) // withdraw value is negative { System.out.println (); System.out.println ("Error: Withdraw amount is invalid."); System.out.println ("Account: " + acctNumber); System.out.println ("Requested: " + fmt.format(amount)); } else if (amount > balance) // withdraw value exceeds balance { System.out.println (); System.out.println ("Error: Insufficient funds."); System.out.println ("Account: " + acctNumber); System.out.println ("Requested: " + fmt.format(amount)); System.out.println ("Available: " + fmt.format(balance)); } else balance = balance - amount; return balance; } //----------------------------------------------------------------- // Adds interest to the account and returns the new balance. //----------------------------------------------------------------- public double addInterest () { balance += (balance * RATE); return balance; } //----------------------------------------------------------------- // Returns the current balance of the account. //----------------------------------------------------------------- public double getBalance () { return balance; } //----------------------------------------------------------------- // Returns the account number. //----------------------------------------------------------------- public long getAccountNumber () { return acctNumber; } //----------------------------------------------------------------- // Returns a one-line description of the account as a string. //----------------------------------------------------------------- public String toString () { return (acctNumber + "\t" + name + "\t" + fmt.format(balance)); } }

Drvier Class

public class test { public static void main(String[] args) { // Created here Account defaultAccount = new Account(); Account a = new Account("userA", 123, 200); Account b = new Account("userB", 234, 500); System.out.println(defaultAccount.getBalance()); // Tranfer a.withdraw(100, 5); System.out.println(a.getBalance()); b.deposit(100); System.out.println(b.getBalance()); } public static void transfer (Account from, Account to, double amount, double fee) { from.withdraw(amount, fee); to.deposit(amount); } }

Answer 2

创建一种方法transfer（字符串ID，双倍金额），该方法利用deposit（字符串ID，双倍amt）和提款（双倍金额）方法来转移资金。

如何通过Java将资金从一个银行帐户转移到另一个银行帐户？

2 个答案: