问题：
如何在爪哇将资金从一个银行账户转移到另一个银行账户？
赫连俊雄
我正在开发一个银行账户类，可以从银行账户余额中存取款。我正在处理分配的类部分，在那里你声明了驱动程序的所有方法。我的任务是让我做一个方法，将钱从一个帐户，并存入另一个帐户。我已经知道如何取款和存钱了，只是不知道如何把钱从一个账户转到另一个账户。以下是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));
}
}
共有1个答案
姬凡
您的转移方法没有目的。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());
}
把它变成一种方法
public static void transfer (Account from, Account to, double amount, double fee)
{
from.withdraw(amount, fee);
to.deposit(amount);
}
编辑
-
null
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));
}
}
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);
}
}
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