Java-存儲要登錄的字符串

Question

我要做的任務是要求用戶輸入其姓氏，並為用戶提供一個帳號以登錄該程序。 我在下面列出了可能更有意義的步驟。

1）用戶創建一個帳戶

2）用戶輸入姓氏

3）為用戶提供一個帳號

4）用戶然后可以使用其姓氏和帳號登錄

用戶輸入其姓氏，然后會給他們一個帳號，然后用該帳號登錄以存入，提取和檢查余額。

我如何創建一個程序來執行此操作而不使用數據庫？

帳戶類別

private static int number = 500;

Account(){

    accountNumber = number++;
}

創建帳戶類別

public void createAccount(){

    String firstName;

    System.out.print("Please Enter Last Name: ");
    lastName = scanner.nextLine();
    System.out.println("This is your Account Number to log into: " + _______ );
}

public void logIn(){

    System.out.println("Please enter your last name: ");

    System.out.println("Please enter your account number: ");

}

Answer 1

從帳戶開始。 僅應使用名字（姓氏）來構造它，並具有一些用於帳號和余額的字段。

快速開始：

public class Account 
{
    private static int number = 500;

    private int accountNumber; 
    private int balance = 0; //(in cents or a float if this is in full dollars)
    private String name;

    public Account(String name){
        accountNumber = number++;
        this.name = name;
    }

    public String getName(){
        return this.name;
    }

    public int getBalance(){
        return this.balance;
    }

    public boolean withdrawMoney(int amount){
        if(this.balance < amount)
            return false;
        this.balance -= amount;
        return true;
    }

    public int getAccountNumber(){
        return this.accountNumber;
    }
}

然后為每個輸入的名稱為該用戶創建一個帳戶，然后對它進行任何操作。

public void createAccount(){

    System.out.print("Please Enter Last Name: ");
    String lastName = scanner.nextLine();

    /* Create an account */
    Account account = new Account(lastName);

    /* TODO: Save all accounts into a ArrayList<Account> to keep track of them */

    System.out.println("This is your Account Number to log into: " + account.getAccountNumber());
}

public void logIn(){

    System.out.println("Please enter your last name: ");
    String lastName = scanner.nextLine();

    System.out.println("Please enter your account number: ");
    String accountNumber = scanner.nextLine();

    /* TODO: Convert accountNumber to an int */

    /* TODO: Check if an account exists in that list of saved accounts which has
       that lastName and that account number 
    */

    /* TODO: Add interaction with the bank account */
}

您應該自己解決其余的問題。 對於帳戶的“數據庫”，您可以簡單地使用static ArrayList<Account> allAccounts ，該聲明在UI類中的某個位置進行了聲明和初始化。 或者，您可以將其卸載到一個單獨的“容器”類中，該類可以為您完成此工作。