Question

每当用户想要创建新帐户时，我该如何创建唯一对象？

例如，如果用户创建了一个帐户，我想要一个名为 acc1 的对象，那么如果用户创建了另一个帐户，我想要名为acc2的对象。 Account ac = new Account(input.nextInt(),0,0);。这就是我需要它发生的地方。

我尽量保持代码尽可能简单，并且还注意到我对java很新，这是一个只是为了学习的个人项目。

 System.out.println("Welcome to JAVA Bank");
    System.out.println("____________________");
    System.out.println("Plese Choose an Option: ");
    System.out.println("");
    System.out.println("(1) New Account");
    System.out.println("(2) Enter Existing Account");



    int choice = input.nextInt();


    switch(choice){

        case 1:
            System.out.println("Please choose an Account ID#");
            Account ac = new Account(input.nextInt(),0,0);
            break;




public class Account {

private int id = 0;
private double balance = 0;
private double annualInterestRate = 0;
private Date dateCreated;

public Account(int id, double balance, double annualInterestRate) {
    this.id = id;
    this.balance = balance;
    this.annualInterestRate = annualInterestRate;
    this.dateCreated = new Date();

}

感谢您的帮助。

Answer 1

如果您想要一种识别多个帐户的独特方式，或许可以使用HashMap。 HashMap存储每个键唯一的键值对。

创建一个类级变量来存储帐户：

Map<String, Account> accounts = new HashMap<String, Account>();

创建/添加帐户到HashMap：

case 1:
    System.out.println("Please choose an Account ID#");
    int accountID = input.nextInt(); //Get the requested ID
    if (accounts.containsKey("acc"+accountID) //Check to see if an account already has this ID (I added acc to the start of each account but it is optional)
    {
       //Tell user the account ID is in use already and then stop
       System.out.println("Account: " + accountID + " already exists!");
       break;
    }

        //Create account and add it to the HashMap using the unique identifier key
        Account ac = new Account(input.nextInt(),0,0);
        accounts.put("acc"+accountID, ac);

Java如何创建唯一的对象名称？

1 个答案: