银行程序无法正常工作

Question

I know that it is not a debugger site but I just wanted to ask what I am doing wrong in this piece of code.

When I run the program I first add a new account, then when I deposit or withdraw it says Wrong Password. Here is my code

Code :

import java.io.*;
import java.util.Random;
public class BankA {
public static int NewRandom(int min, int max) {
    Random rand = new Random();
    int randomNum = rand.nextInt((max - min) + 1) + min;
    return randomNum;
}
public static void main(String args[])throws IOException, InterruptedException {
    InputStreamReader ir = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(ir);
    Bank myBank = new Bank();
    int Option = 1, Account_Number, Account_Password, atempts = 0, Pass;
    String Name;
    double Balance, Money;
    System.out.println("Please wait, the system is starting...");
    while(Option !=5) {
        Thread.sleep(4000);
        System.out.println("1) Open a new bank account");
        Thread.sleep(250);
        System.out.println("2) Deposit to a bank account");
        Thread.sleep(250);
        System.out.println("3) Withdraw to bank account");
        Thread.sleep(250);
        System.out.println("4) Print the detailed account information including last transactions");
        Thread.sleep(250);
        System.out.println("5) Quit");       
        System.out.println();      
        System.out.print("                       Enter Option [1-5]: ");
        Option = Integer.parseInt(br.readLine());
        switch(Option) {
            case 1 : System.out.println("Enter a customer name :");
                     Name = br.readLine();
                     System.out.println("Enter a opening balance :");
                     Balance = Double.parseDouble(br.readLine());
                     Thread.sleep(250);
                     System.out.println("Creating your account....");
                     Thread.sleep(500);
                     System.out.println("Account Has been created\n Account number: " + myBank.AddNewAccount(Name, Balance)[0]+"\nYour password : "+ myBank.AddNewAccount(Name, Balance)[1]);
                     break;
            case 2 : System.out.println("Enter a account number :");
                     Account_Number = Integer.parseInt(br.readLine());
                     System.out.println("Enter a account password :");
                     Account_Password = Integer.parseInt(br.readLine());
                     System.out.println("Enter a deposit amount :");
                     Money = Double.parseDouble(br.readLine());
                     myBank.Deposit(Account_Number, Account_Password, Money);
                     break;
            case 3 : System.out.println("Enter a account number :");
                     Account_Number = Integer.parseInt(br.readLine());
                     System.out.println("Enter a account password :");
                     Account_Password = Integer.parseInt(br.readLine());
                     System.out.println("Enter a deposit amount :");
                     Money = Double.parseDouble(br.readLine());
                     myBank.Withdraw(Account_Number, Account_Password, Money);
                     break;
            case 4 : System.out.println("Enter a account number :");
                     Account_Number = Integer.parseInt(br.readLine());
                     System.out.println("Enter a account password :");
                     Account_Password = Integer.parseInt(br.readLine());
                     myBank.Transactions(Account_Number, Account_Password);
                     break;
            case 5 : System.out.println("Please Enter your password :");
                     Pass = Integer.parseInt(br.readLine());
                     if(Pass == myBank.Password) {
                         System.out.println("                       System shutting down.....");
                         Option = 5;
                         break;
                     } 
                     else {
                         Thread.sleep(250);
                         System.out.println("You have enter a wrong password. Please try again");
                         Option = 0;
                     }
            default: System.out.println("Invalid option. Please try again.");
        }
    }
}
static class Bank {
    private int Password=2684;
    private BankAccount[] accounts;
    private int numOfAccounts;
    public Bank() {
        accounts = new BankAccount[100];
        numOfAccounts = 0;
    }
    public int [] AddNewAccount(String Name, Double Balance) {
        BankAccount b = new BankAccount(Name, Balance);
        accounts[numOfAccounts] = b;
        numOfAccounts++;
        int Acc = b.getAccountNum()[0];
        int Pass = b.getAccountNum()[1];
        int[]details = {Acc, Pass};
        return details;
    }
    public void Withdraw(int Account_Number, int pass, double Money) {
        for (int i =0; i<numOfAccounts; i++) {     
            int a = accounts[i].getAccountNum()[0];
            int p = accounts[i].getAccountNum()[1];
            if (Account_Number == a) {
                if( pass == p) {
                    accounts[i].withdraw(Money);
                    System.out.println("                       Amount withdrawn successfully");
                    return;
                } else {
                    System.out.println("Wrong Password");
                }
            }   
        }  
        System.out.println("                       Account number not found.");
    }
    public void Deposit(int Account_Number, int pass, double Money) {  
        for (int i =0; i<numOfAccounts; i++) {     
            int a = accounts[i].getAccountNum()[0];
            int p = accounts[i].getAccountNum()[1];
            if (Account_Number == a) {
                if( pass == p) {
                    accounts[i].withdraw(Money);
                    System.out.println("                       Amount deposited successfully");       
                    return;   
                } else {
                    System.out.println("Wrong Password");
                }
            }   
        }  
        System.out.println("                       Account number not found.");
    }
    public void Transactions(int Account_Number, int pass) {
        for(int i = 0;i<numOfAccounts; i++) {
            int a = accounts[i].getAccountNum()[0];
            int p = accounts[i].getAccountNum()[1];
            if (Account_Number ==  a ) {
                if( pass == p) {
                    System.out.println(accounts[i].getAccountInfo());
                    System.out.println("                        Last transaction: " + accounts[i].getTransactionInfo(accounts[i].getNumberOfTransactions()-1));
                    return;
                } else {
                    System.out.println("Wrong Password");
                }
            }
        }
        System.out.println("Account number not found.");
    }
}
static class BankAccount{
    private int User_Password;
    private int accountNum;
    private String customerName;
    private double balance;
    private double[] transactions;
    private String[] transactionsSummary;
    private int numOfTransactions;
    private  static int noOfAccounts=0;
    public String getAccountInfo(){          
        return "                        Account number: " + accountNum + "\n                        Customer Name: " + customerName + "\n                        Balance:" + balance +"\n";
    }
    public String getTransactionInfo(int n) {
        String transaction = transactionsSummary[n];
        return transaction;
        }
    public BankAccount(String abc, double xyz){        
        customerName = abc;        
        balance = xyz;        
        noOfAccounts ++;
        User_Password = NewRandom(1000, 9999);
        accountNum = NewRandom(800000000, 999999999);       
        transactions = new double[100];                         
        transactionsSummary = new String[100];               
        transactions[0] = balance;                      
        transactionsSummary[0] = "A balance of : Rs" + Double.toString(balance) + " was deposited.";       
        numOfTransactions = 1;             
    }
    public int [] getAccountNum(){
        int account = accountNum;
        int Pass = User_Password;
        int [] details = {account, Pass};
        return details;
    }
    public int getNumberOfTransactions() {           
        return numOfTransactions;          
    }         
    public void deposit(double amount){         
        if (amount<=0) {         
            System.out.println("Amount to be deposited should be positive");        
        } else {          
            balance = balance + amount;            
            transactions[numOfTransactions] = amount;            
            transactionsSummary[numOfTransactions] = "Rs." + Double.toString(amount) + " was deposited.";            
            numOfTransactions++;           
        }         
    }
    public void withdraw(double amount) {                   
        if (amount<=0){                
            System.out.println("Amount to be withdrawn should be positive"); 
        } 
        else {  
            if (balance < amount) {  
                System.out.println("Insufficient balance");   
            } else {  
                balance = balance - amount;  
                transactions[numOfTransactions] = amount;   
                transactionsSummary[numOfTransactions] = "Rs." + Double.toString(amount) + " was withdrawn.";     
                numOfTransactions++;                       
            }   
        }
    }
}
}

Answer 1

You have a problem in your code where you create the new account:

System.out.println("Account Has been created\n Account number: " + myBank.AddNewAccount(Name, Balance)[0]+"\nYour password : "+ myBank.AddNewAccount(Name, Balance)[1]);

You're calling myBank.AddNewAccount() twice on that line, which means that the account number printed will be for account #1, while the password printed will be for account #2.

Change it so that you're only creating one account and printing the details for it:

int[] newAccount = myBank.AddNewAccount(Name, Balance);
System.out.println("Account Has been created\n Account number: " + newAccount[0]+"\nYour password : "+ newAccount[1]);

Also, while I tested your code, it seems you're calling withdraw() instead of deposit() in Bank.deposit() :

accounts[i].withdraw(Money);

Answer 2

It's because myBank.AddNewAccount(Name, Balance) is getting called twice in below statement, actually it should be called only once per account.

System.out.println("Account Has been created\n Account number: " + myBank.AddNewAccount(Name, Balance)[0]+"\nYour password : "+ myBank.AddNewAccount(Name, Balance)[1]);

make below changes to your code and sit should work fine:

  int[] arrDetails= myBank.AddNewAccount(Name, Balance);//added new line of code                     
  System.out.println("Account Has been created\n Account number: " + arrDetails[0]+"\nYour password : "+ arrDetails[1]);// modified existing code

Final code for Case 1 should be:

case 1 : System.out.println("Enter a customer name :");
                     Name = br.readLine();
                     System.out.println("Enter a opening balance :");
                     Balance = Double.parseDouble(br.readLine());
                     Thread.sleep(250);
                     System.out.println("Creating your account....");
                     Thread.sleep(500);

                     int[] arrDetails= myBank.AddNewAccount(Name, Balance);                     
                     System.out.println("Account Has been created\n Account number: " + arrDetails[0]+"\nYour password : "+ arrDetails[1]);
                     break;

Answer 3

Your problem is here:

System.out.println("Account Has been created\n Account number: " + myBank.AddNewAccount(Name, Balance)[0]+"\nYour password : "+ myBank.AddNewAccount(Name, Balance)[1]);

Why do you add a new account twice in the above method? This creates a duplicate account with a different password. Change the above line to this.

myBank.AddNewAccount(Name, Balance);
System.out.println("Account Has been created\n Account number: " + myBank.getAccountNum()[0].+"\nYour password : "+ myBank.getAccountNum()[1]);

Answer 4

Your creating two objects and returning second obj password.

System.out.println("Account Has been created\n Account number: " + myBank.AddNewAccount(Name, Balance)[0]+"\nYour password : "+ myBank.AddNewAccount(Name, Balance)[1]);

In Above code your calling myBank.AddNewAccount two times so, it is creating two objects and THE PASSWORD YOUR PRINTING IS SECOND OBJECT PASSWORD, that's why it is showing wrong password. you can use this code.

int[] details = myBank.AddNewAccount(Name, Balance);
System.out.println("Account Has been created\n Account number: " + details [0]+"\nYour password : "+ details[1]);