java创建唯一的增量id并将其添加到集合中

Question

问题是，我需要为每个新客户创建新的增量ID，并将其添加到集合中，我正在尝试使用while循环，但它似乎不正确

public class Bank {

    private String name;

    private Set<Customer> customers = new HashSet<Customer>();


    private Set<AbstractAccount> accounts = new HashSet<AbstractAccount>();

    private Integer lastCustomerId = 0;

    private Integer lastAccountId = 0;

    public Integer addCustomer(String firstName, String lastName) {
        // generate id from lastCustomerId and increment it
        // add to Set
        return lastCustomerId++; 
    }

    public Integer addAccount(Integer ownerId, AccountType type) {
        // add to Set
    }       



}

Answer 1

我不确定这是不是你想要的

public class Bank
{

    private String name;

   private Set<Customer> customers = new HashSet<Customer>();


    private Set<AbstractAccount> accounts = new HashSet<AbstractAccount>();


    private static int lastCustomerId = 0;
    private static int lastAccountId = 0;

    public static int GetNextCustomerID()
    {
        lastCustomerId++;
        return lastCustomerId;
    }

    public static int GetNextAccountID()
    {
        lastAccountId++;
        return lastAccountId;
    }

    public int addCustomer(String firstName, String lastName) 
    {
       // generate id from lastCustomerId and increment it
        int customerId = GetNextCustomerID();
        // add to Set
    }

    public int addAccount(int ownerId, AccountType type) 
    {
        // add to Set
        int accountId = GetNextAccountID();
    }   
}