Question

I want to develop a simple login and registration system. The system needs to be able to register a user and allow them to login. Not only this i need to be able to identify who is the current user logged in.

User Class

import java.io.Serializable;


public class AuctionHouseUsers implements Serializable {

    String userName;
    String password;

    public AuctionHouseUsers(String aUserName, String aPassword)
    {
        this.userName = aUserName;
        this.password = aPassword;
    }
    public String getUserName()
    {
        return userName;
    }
    public void setUserName(String aUserName)
    {
        this.userName = aUserName;
    }
    public String getPassword()
    {
        return password;
    }
    public void setPassword(String aPassword)
    {
        this.password = aPassword;
    }
}

AuctionHouse Class

    public class AuctionHouseManager

ArrayList<AuctionHouseUsers> registeredUsers;
ArrayList<AuctionHouseUsers> logedInUsers;


public AuctionHouseManager()

    logedInUsers = new ArrayList<AuctionHouseUsers>();
    registeredUsers = new ArrayList<AuctionHouseUsers>();
}
    public void registerUser(String username, string password)
    {
        AuctionHouseUsers registeredUser = new AuctionHouseUser(username,password);
        registeredUsers.add(tempUser);
    }
    public void logIn(String username, string password)
    {
      AuctionHouseUsers logedInUser = new AuctionHouseUser(username,password);
      logedInUsers.add(logedInUser);
    }

How can i keep track of who (by there username) is currently logged in at this moment in time as i will be designing a gui.

Answer 1

If this is not an homework but an actual development project I would advise you to use Apache Shiro or Spring Security . Both offer support for authentication and access-control (and much more).

Hope this helps.