设计Account 对象如下：  private long id;       private double balance;       private String password; 要求完善设计，使得该Account 对象能够自动分配id。 给定一个List 如下：

package homework005;

public class Account {

    private long id;
    private double balance;
    private String password;
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public double getBalance() {
        return balance;
    }
    public void setBalance(double balance) {
        this.balance = balance;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Account(long id, double balance, String password) {
        super();
        this.id = id;
        this.balance = balance;
        this.password = password;
    }
    public Account() {
        super();
    }
    @Override
    public String toString() {
        return "Account [id=" + id + ", balance=" + balance + ", password=" + password + "]";
    }
    public Account(double balance, String password) {
        super();
        this.balance = balance;
        this.password = password;
    }

}

package homework005;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Ls {

    public static void main(String[] args) {

        List<Account> list = new ArrayList<>();
        list.add(new Account(10.00,"1234"));
        list.add(new Account(15.00,"5678"));
        list.add(new Account(0,"1010"));

        Map<Long, Account> map = new HashMap<>();
        for(int i =0;i<=list.size()-1;i++)
        {
            map.put((long) i, list.get(i));
        }

        for(long k:map.keySet())
        {
            System.out.println("id="+k+"   balance="+map.get(k).getBalance());
        }

    }

}