package com.mozilla.bespin;public class UserSession {    public static final String MESSAGE_NOT_LOGGED_IN = "You are not logged in";    public static final String MESSAGE_LOGGED_IN = "You are logged in as %1$s";    public static final String MESSAGE_LOGGED_OUT = "You are logged out";    public String username;    @Override    public boolean equals(Object o) {        if (this == o) return true;        if (o == null || getClass() != o.getClass()) return false;        UserSession that = (UserSession) o;        if (!username.equals(that.username)) return false;        return true;    }    @Override    public int hashCode() {        return username.hashCode();    }}