首先，对于广泛的标题，我感到抱歉，我不确定如何措辞。无论如何，我正在制定一个允许多个人拥有多个帐户的银行计划。但是，每当一个新人创建一个帐户时，都会将该帐户添加到其他所有人中，这就是为什么。我已经尽力想了一切，但没有运气。我知道可能不需要管理类，但这是我尝试解决的问题之一。另外，最后的两节课用于支票和储蓄帐户，一旦解决此问题，我将完成这些课程。 任何帮助都感激不尽：）
import java.util.ArrayList;
import javax.swing.*;
class Bank implements Comparable {
private double bal;
private int accountNumber;
private String accountName;
public Bank() {
}
void display_details() {
System.out.println("Account Number : " + accountNumber);
System.out.println("Account Balance : " + bal + "\n\n\n");
JOptionPane.showMessageDialog(null,
"Account Name:" + accountName + "\nAccount Number : " + accountNumber + "\nAccount Balance : " + bal,
"You own " + FinancialFolk.Bank.size() + " account[s]", JOptionPane.INFORMATION_MESSAGE);
}
public void deposit(double depositAmount) {
bal += depositAmount;
JOptionPane.showMessageDialog(null, "Your new balance is: $" + bal);
}
public void withdraw(double withdrawAmount) {
if (withdrawAmount > bal) {
JOptionPane.showMessageDialog(null, "Insufficient Funds");
} else {
bal -= withdrawAmount;
JOptionPane.showMessageDialog(null, "Your new balance is: $" + bal);
}
}
public void transfer() {
}
@Override
public int compareTo(Object arg0) {
// TODO Auto-generated method stub
return 0;
}
public double getBal() {
return bal;
}
public void setBal(double baL) {
bal = baL;
}
public int getAccountNumber() {
return accountNumber;
}
public void setAccountNumber(int accountNumbe) {
accountNumber = accountNumbe;
}
public String getAccountName() {
return accountName;
}
/**
* @param accountName the accountName to set
*/
public void setAccountName(String accountName) {
this.accountName = accountName;
}
}
class FinancialFolk implements PasswordVerifivation {
private String accountUsername, accountHolderName, accountPassword;
protected ArrayList<Bank> accounts = new ArrayList<>();
protected static ArrayList<FinancialFolk> Bank = new ArrayList<>();
private int memberTime;
public FinancialFolk(String username, String name, String password) {
accountUsername = username;
accountHolderName = name;
accountPassword = password;
}
public FinancialFolk() {
accountUsername = "";
accountHolderName = "";
accountPassword = "";
}
public void passwordCreation() {
accountPassword = JOptionPane.showInputDialog("Please choose a secure password for your account.");
}
public boolean passwordVerify(String attemptedPassword) {
return accountPassword.equals(attemptedPassword);
}
public boolean createNewPerson() { // Creates a new FinancialFolk.
accountHolderName = (JOptionPane.showInputDialog("Please enter your name."));
if (accountHolderName == null)
return false;
String Username = (JOptionPane.showInputDialog("Please enter a username for your account."));
for (FinancialFolk fk : Bank) {
if (fk.getAccountUsername().equals(Username)) {
JOptionPane.showMessageDialog(null, "That username is taken!");
return false;
}
}
accountUsername = Username;
passwordCreation();
return true;
}
public void createNewAccount() { // Adds an account to an existing FinancialFolk.
Bank check = new Checking();
Bank save = new Savings();
String[] buttons = { "Checking", "Savings" };
int acc = JOptionPane.showOptionDialog(null, "What type of account would you like to make?", "Bank",
JOptionPane.PLAIN_MESSAGE, 1, null, buttons, buttons[1]);
switch (acc) {
case 0:
check.setAccountName((JOptionPane.showInputDialog("Please enter a name for this account.")));
check.setAccountNumber((int) (Math.random() * 3000 + 1091));
accounts.add(check);
check.display_details();
break;
case 1:
save.setAccountName((JOptionPane.showInputDialog("Please enter a name for this account.")));
save.setAccountNumber((int) (Math.random() * 3310 + 789));
accounts.add(save);
save.display_details();
break;
}
}
public static void main(String[] args) {
Bank user = new Bank();
FinancialFolk FF = new FinancialFolk();
boolean exit = false;
do {
String[] buttons = { "Create Account For The First Time", "Login", "Exit Bank", "" };
int rc = JOptionPane.showOptionDialog(null, "What would you like to do?", "Bank", JOptionPane.PLAIN_MESSAGE,
3, null, buttons, buttons[3]);
switch (rc) {
case 0: // create account
if (FF.createNewPerson()) {
Bank.add(FF);
Bank.get(Bank.size() - 1).createNewAccount();
}
break;
case 1: // login
boolean logout = false;
boolean incun = true;
String an = JOptionPane.showInputDialog("Enter your username.\n");
String ps = JOptionPane.showInputDialog("Enter your acccount password.\n");
for (FinancialFolk x : Bank) {
if (x.getAccountUsername().equals(an)) {
incun = false;
if (x.passwordVerify(ps)) {
do {
String[] buttons2 = { "View all accounts.", "Deposit into an account",
"Withdraw from your account", "Change password", "Create another bank account",
"Logout" };
int rc2 = JOptionPane.showOptionDialog(null, "What would you like to do?", "Bank",
JOptionPane.PLAIN_MESSAGE, 3, null, buttons2, buttons2[4]);
switch (rc2) {
case 0: // all accounts
int networth = 0;
for (Bank acct : FF.accounts) {
acct.display_details();
networth += acct.getBal();
}
JOptionPane.showMessageDialog(null,
"Your account total between all accounts: $" + networth);
break;
case 1: { // deposit
if (x.accounts.size() == 0)
JOptionPane.showMessageDialog(null, "You do not have any accounts!");
else if (x.accounts.size() == 1) {
x.accounts.get(0).deposit(Integer.parseInt(JOptionPane
.showInputDialog("Enter how many dollars you want to deposit.\n")));
} else {
JOptionPane.showMessageDialog(null, x.accounts.size());
String a = (JOptionPane
.showInputDialog("Enter the account name to deposit into.\n"));
for (Bank act : x.accounts) {
if (act.getAccountName().equalsIgnoreCase(a))
act.deposit(Integer.parseInt(JOptionPane.showInputDialog(
"Enter how many dollars you want to deposit.\n")));
}
}
}
break;
case 2:
if (x.accounts.size() == 0)
JOptionPane.showMessageDialog(null, "You do not have any accounts!");
else if (x.accounts.size() == 1) {
x.accounts.get(0).withdraw(Integer.parseInt(JOptionPane
.showInputDialog("Enter how many dollars you want to withdraw.\n")));
} else {
String a = (JOptionPane
.showInputDialog("Enter the account name to withdraw from.\n"));
for (Bank act : x.accounts) {
if (act.getAccountName().equalsIgnoreCase(a))
act.deposit(Integer.parseInt(JOptionPane.showInputDialog(
"Enter how many dollars you want to withdraw.\n")));
}
}
break;
case 3:
x.passwordSet((JOptionPane.showInputDialog("Enter your new password.\n")));
break;
case 4:
x.createNewAccount();
break;
case 5:
logout = true;
break;
}
} while (!logout);
} else
incun = true;
}
}
if (incun)
JOptionPane.showMessageDialog(null, "Invalid Username or password");
break;
case 2:
JOptionPane.showMessageDialog(null, "Thank you for using the JacoBank");
exit = true;
break;
case 3:
System.out.print(Bank.size());
System.out.print(FF.accounts.size());
break;
}
} while (!exit);
}
public String getAccountHolderName() {
return accountHolderName;
}
public void setAccountHolderName(String accountHolderName) {
this.accountHolderName = accountHolderName;
}
public String getAccountUsername() {
return accountUsername;
}
@Override
public void passwordSet(String password) {
accountPassword = password;
}
}
class Manage {
}
class Checking extends Bank {
private int checkCount;
}
class Savings extends Bank {
}
答案 0 :(得分：3)
protected static ArrayList<Bank> accounts = new ArrayList<>();
实例变量上下文中static的定义是该类的所有实例（在本例中为“ FinancialFolk”）共享变量的相同副本。这就是为什么您在创建新帐户时看到为每个人添加的帐户的原因。
换句话说：由于关键字static，每个“ FinancialFolk”对象的“ accounts”变量都指向堆中完全相同的arraylist。
答案 1 :(得分：1)
FinancialFolk FF =新的FinancialFolk（）;
上一行应处于do-while循环中。您仅创建了一个对象，并为所有用户帐户对同一对象进行了更改。