PR2-travelbuddyapp/src/main/java/de/hs_mannheim/domain/System.java

package de.hs_mannheim.domain;

import java.util.HashSet;

public class System {
    
    private User current_user;

    public HashSet<User> get_all_user(){
        return new HashSet<User>();
    }

    public boolean sign_in_user(String username, String password){
        return true;
    }

    public boolean sign_up_user(String username, String password, String hometown, int zip, 
                                String car_name, double car_co2_km, double car_avg_kmh, double bike_avg_kmh){
        return true;
    }

    public void sign_out_user(){}

    public boolean change_user_details(String username, String password, String hometown, int zip, 
                                String car_name, double car_co2_km, double car_avg_kmh, double bike_avg_kmh){
        return true;
    }

}