Java 我如何调用和存储此信息

我有一个问题，我想我知道答案，但我不太确定

所以我做了这个程序，下面是account类和使用它的银行程序

帐户类别

import java.util.Scanner;
import java.util.UUID;


public class Account {

double balance;

String name;

UUID AcctN;

int pin;


public void Account ()
{
    UUID idOne = UUID.randomUUID();
    Scanner sc = new Scanner (System.in);
    Scanner sa = new Scanner (System.in);

    System.out.println ("Your starting balance is 0.0");
    double initBal = 0;
    balance = initBal;

    System.out.println ("Enter your full name");
    String owner = sa.nextLine();
    name = owner;

    UUID number = idOne;
    AcctN = number;

    System.out.println ("Enter your pin number containing ONLY 4 numbers");
    int pins = sc.nextInt();
    pin = pins;



}

public void withdraw (double amount)
{
    if (balance <= 0)
    {
        System.out.println ("Insufficent funds");
    }
    else
    {
        balance -= amount;
    }


}



public void deposit (double amount)
{
    if (amount <= 0)
    {
        System.out.println ("You cannot deposit negative or 0 funds");
    }
    else
    {
        balance += amount;
    }


}

public void withdrawfee (double amount)
{

    if (balance <= 0)
    {
        System.out.println ("Insufficent funds");
    }
    else
    {
        double fee = 10;
        balance -= amount + fee;
    }

}


public double getBalance ()
{
    return balance;
}
public String toString()
{
    return String.format ("User info: %s\n Balance: $%s\n Account Number: %s\n Pin Number: %s",     name, balance, AcctN, pin);
}
}

所以“创建帐户”只适用于一个人，如果我再次创建它，那么它只会覆盖名称和余额

所以，如果我想基本上存储所有这些信息，我是否只需要使用一个数组？但是，我如何才能给每个用户打电话，并从这些特定帐户中提取/存入资金呢

我认为二叉搜索树可能有效，但同时我不确定一个简单的数组列表是否有效

为了澄清，我希望我能够

1调用特定用户时，可能必须使用.contains，我认为contains应该链接到特定且唯一的帐户ID

2一旦到达该用户，他们就可以按当前状态使用开关菜单

---

这只是一个帮助您更好地理解Java工作原理的个人项目，而不是家庭作业。

听起来您希望它保持简单。我们可以使用数组列表或列表。。。或者地图。既然账户的顺序无关紧要，我建议你用一张地图。但是，由于您似乎是java语言的新手，因此最好在大部分时间使用列表，因此我将向您展示如何使用列表

代码还有其他问题。。。就像它将只运行一次与一个帐户。有很多东西需要扩展。如果你真的感兴趣，我可以在skype@yawang2247上帮你完成这个简单的项目

否则，以下内容将解决您当前的问题。 这应该是你修改过的主要课程：

import java.util.Scanner;

public class Tester {

ArrayList<Account> myList;

public static void main (String [] args)
{
myList = new ArrayList<ACT>(); 
Scanner sc = new Scanner (System.in);
boolean quit = false;
Account ACT = new Account ();



do
{
    System.out.println ("Welcome to the Bank\n\n***********\n 1: Create account\n 2: Check accounts\n 3: Withdraw funds\n 4: Withdraw with fee\n 5: Deposit funds\n 6: Quit");
    int input = sc.nextInt();
    switch (input)
    {
    case 1: 
    if(listContains(ACT.getAcctN())){
    // you need to make the above getAcctN() method in you Account.java
        System.out.println ("You already have an account!");
        break;
    }
        System.out.println ("Make an account");
        ACT.Account();
        System.out.println ("Current information: ");
        System.out.println (ACT.toString());
        myList.add(ACT);
        break;
    case 2:
        System.out.println (ACT.toString());
        break;
    case 3:
        System.out.println ("How much do you wish to withdraw?");
        ACT.withdraw(sc.nextDouble());
        System.out.println ("Thank you for your service");
        break;
    case 4:
        System.out.println ("How much do you wish to withdraw?");
        ACT.withdrawfee(sc.nextDouble());
        System.out.println ("An additional 10 dollars has been deducted from your account");
        System.out.println ("Thank you for your service");
        break;
    case 5:
        System.out.println ("How much do you wish to deposit");
        ACT.deposit(sc.nextDouble());
        System.out.println ("Thank you for your service");
        break;
    case 6:
        quit = true;
        break;
    }

}while(!quit);
System.out.println ("Thank you for using the Bank..");

}
// below searches array for a particular account
public static boolean listContains(UUID accountNum) {
    for(int i = 0; i < myList.size(); i++) {
        if(myList.get(i).getAcctN() == accountNum) {
            return true;
        }
    }
    return false;
}
 }

import java.util.Scanner;

public class Tester {

ArrayList<Account> myList;

public static void main (String [] args)
{
myList = new ArrayList<ACT>(); 
Scanner sc = new Scanner (System.in);
boolean quit = false;
Account ACT = new Account ();



do
{
    System.out.println ("Welcome to the Bank\n\n***********\n 1: Create account\n 2: Check accounts\n 3: Withdraw funds\n 4: Withdraw with fee\n 5: Deposit funds\n 6: Quit");
    int input = sc.nextInt();
    switch (input)
    {
    case 1: 
    if(listContains(ACT.getAcctN())){
    // you need to make the above getAcctN() method in you Account.java
        System.out.println ("You already have an account!");
        break;
    }
        System.out.println ("Make an account");
        ACT.Account();
        System.out.println ("Current information: ");
        System.out.println (ACT.toString());
        myList.add(ACT);
        break;
    case 2:
        System.out.println (ACT.toString());
        break;
    case 3:
        System.out.println ("How much do you wish to withdraw?");
        ACT.withdraw(sc.nextDouble());
        System.out.println ("Thank you for your service");
        break;
    case 4:
        System.out.println ("How much do you wish to withdraw?");
        ACT.withdrawfee(sc.nextDouble());
        System.out.println ("An additional 10 dollars has been deducted from your account");
        System.out.println ("Thank you for your service");
        break;
    case 5:
        System.out.println ("How much do you wish to deposit");
        ACT.deposit(sc.nextDouble());
        System.out.println ("Thank you for your service");
        break;
    case 6:
        quit = true;
        break;
    }

}while(!quit);
System.out.println ("Thank you for using the Bank..");

}
// below searches array for a particular account
public static boolean listContains(UUID accountNum) {
    for(int i = 0; i < myList.size(); i++) {
        if(myList.get(i).getAcctN() == accountNum) {
            return true;
        }
    }
    return false;
}
 }