Question

I want to store information, String username, String password and String loginType.

When a login is attempted, I want to find if the username exists, then verify the password and return the loginType.

What is the best type of collection for storing this?

What i need to be able to do is –> When i try to add details I first must check if the username is already there. If there is no match, my details will save, if the username already exists the data wont save.

I also need to search. I want to be able to find the username. and then verify if i have a password match and return the type

The order of these items does not matter.

What is the best type of collection for storing this?

Answer 1

Not a collection; I’d create an object called Credentials:

package security;

public class Credentials {
    private final String username;
    private final String password; 
    private final String type;

    public Credentials(String u, String p, String t) {
        this.username = u;
        this.password = p;
        this.type = t;    
    }
}

// you add the rest.