ATM simulation system

ATM Computer simulation system

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One 、 summary

（1） Topic analysis

（2） development environment

development environment , choice IDEA this Java Development software , be based on JDK1.8 edition , In this machine window Shangkaiben ATM Simulation program .

Two 、 Program outline design

（1） Function module design

After the analysis of the topic , Put the book ATM The simulation program is divided into two modules: administrator side and user mode . among , The administrator has the ability to query all accounts 、 Export all account information to file 、 Logout function . The user module has the function of querying the balance 、ATM Transfer accounts 、ATM deposit 、ATM Withdraw money 、 Change Password 、 Look up transactions 、 Export records 、 Card return and other functions .

The total functional module diagram of the system is as follows ：

（2） flow chart

The overall process of the system is ： The user can select administrator login or user mode login through the main interface , Then enter the account and password set by the system to log in . After successful login , Enter the corresponding main function page to perform relevant operations .

When the administrator logs in to the background , Determine whether the password and account number are correct , Log in if it is correct , Otherwise, the prompt fails . Log in to the background , You can view all user functions , Then the system will query all the set user information and output it to the console panel . Click the export record function , All account information will be output to the current jar Under the same level directory of the program txt file .

When the user logs in , Determine whether the account password is correct , Incorrect , Then the number of account errors +1, When the number reaches 3 when , The account will be locked , Can not login . When the entered account secret is correct , Determine whether the account is locked , Log in without locking , Jump to the main user interface , And perform relevant operation functions .

The flow chart of the administrator module is as follows ：

The general flow chart of the user module is as follows ：

（3） File structure and class design

Ben ATM The simulator uses idea Edit software development . The project is divided into admin（ Administrators ）、customer（ user ）、data（ATM data ） Three bags .

among admin Under the package AdminManage class , Responsible for initializing the administrator interface , At the same time, all functions of the administrator are realized .Customer Under bag customer Class implements the interface of the user module , Relevant operation buttons are defined , And realize their respective monitoring functions , In order to reduce the interface design , The output information panel is used in the middle of the user interface , The result of this function will be printed in the panel , Simulated atm Machine interface information .

Data There are... Under the bag ATMData class 、Card Classes and CustomerAccount class .Card Class is the code embodiment of the user's bank card , Encapsulate the relevant information of the bank card into a basic Java object , accord with Java Object oriented features . among customerAccount yes card Subclasses of classes , stay card On the basis of , Added a lot of user behavior , For example, deposits 、 Withdraw money 、 Check the balance, etc .ATMData Class is a very important class in this program , It encapsulates all the initial account information of the program , And money transfer 、 Get all accounts 、 Login, etc . This design , Data processing can be separated from interface design , Avoid too much code in the user interface .

The file structure is as follows , among resource The picture information required by this program is stored in the folder ：

3、 ... and 、 Detailed program design

The functional modules of the system are not detailed here , Several main functions are listed for description ：

（1） Withdrawal function

The code of the withdrawal function is designed in customerAccount Class , The input parameter is the withdrawal amount . First determine whether the amount is 100 Multiple , Then judge whether it is greater than 5000（ The title requires that a single withdrawal should not be greater than 5000）, Then judge whether the balance of the current account is greater than or equal to the amount obtained . When these conditions are met , Recalculate the amount of the current account , And add the withdrawal record to the transaction record of the current account .

The core code logic is as follows ：

if (money % 100 != 0) {
    
     return false;
}
if (money > 5000) {
    
  return false;
}
int currentMoney = getMoney();
if (currentMoney < money) {
    
  return false;
}
// Withdraw money 
int result = currentMoney - money;
setMoney(result);
// Add transaction 
List<String> operationRecod = getOperationRecod();
operationRecod.add("【" + LocalDateTime.now().format(dateTimeFormatter) + "】 ATM  Withdraw money  [" + money + "] element , Current balance [" + result + "] element ");

（2） Deposit function

The method parameter is the deposited amount , First, judge whether the amount is 100 Multiple , If the verification is passed, the balance of the current account will be recalculated , Then add transactions to the current account .

The core code logic is as follows ：

 if (money % 100 != 0) {
 	return false;
}

// balance 
int countMoney = getMoney() + money;
setMoney(countMoney);
// Record transactions 
List<String> operationRecod = getOperationRecod();
operationRecod.add("【" + LocalDateTime.now().format(dateTimeFormatter) + "】 ATM  deposit  [" + money + "] element , Current balance [" + countMoney + "] element ");
return true;

（3） User login function

The input parameters of the user login method are account and password , First, determine whether the account exists , Match all accounts set in the participating system , without , The failure . If yes, judge whether the account is locked , Locked and unable to log in , If it is not locked, judge whether the password is correct , If it is not correct, the number of errors in the current account will be +1（ If the number of account errors =3, Lock the account ）. If the password is correct, log in and jump to the main interface .

The core code is as follows ：

// Whether there is an account number

if (allAccount.containsKey(number)) {
    
  CustomerAccount account = allAccount.get(number);
  // Determine whether the account is locked 
  if (account.getErrorCount() >= 3) {
    
    JOptionPane.showMessageDialog(null, " Login failed ！ The account is suspected to have been locked ", " Prompt message ", JOptionPane.WARNING_MESSAGE);
    return null;
    // Is the password consistent 
  } else if (account.getPassword().equals(pwd)) {
    
    // Number of reset errors 
    account.setErrorCount(0);
    return account;
  }
  account.setErrorCount(account.getErrorCount() + 1);
  if (account.getErrorCount() >= 3) {
    
   // Lock account 
    account.setStatus(1);
  }
} else {
    
   // Prompt error message 
  JOptionPane.showMessageDialog(null, " Login failed ！ Wrong card number or password ", " Prompt message ", JOptionPane.WARNING_MESSAGE);

}

Four 、 Program demonstration

Most functions , Don't record here one by one . Only tests for several main functions are recorded here .

（1） ATM Withdraw money

The test withdrawal function is shown in the figure below . The initial amount is 10000 element . Separate withdrawals 3000、6000、5000. The last two are error data . A single withdrawal cannot exceed 5000 element , The latter is the balance 3000 Withdrawal on time 5000, Test that the withdrawal cannot be overdrawn .

test result ：

Thus we can see that , The function is normal , The test results of both legal and illegal data input are consistent with the expectations .

（2） ATM Transfer accounts

Transfer test , The target account must exist , At the same time, the balance should be greater than the amount to be transferred , You can't overdraft . Test data for entering a nonexistent account 、 And the transfer amount greater than the current balance .

Enter the test result of non-existent account as follows ：

Enter the normal account and amount test results as follows , Log in to the target account , Query the transaction records to see that the transfer has successfully reached the target account .

Enter incorrect data greater than the current balance , The test results are as follows , The transfer function test is normal .

（3） Change Password

To change the password, you must enter the original password , Same can be modified . The new password must be greater than 6 position , meanwhile 6 The bits cannot be exactly the same . The password entered for the third time is to confirm the new password , It should be the same as the password entered for the second time .

The original passwords are 123456, Input error data 111111, Test the following ：

Input less than 6 A data , The test results of correctly inputting normal data are as follows ：

🥎🥎🥎《 A private letter that requires the source code 》

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