Activity.java

import java.util.ArrayList;

public abstract class Activity {
//    private String type;
    private String title;
    protected ArrayList<Group> groups;
    private String description;
    private User host;

    public Activity (/*String type,*/ String title, String description, User host){
        /*this.type = type;*/
        this.title = title;
        this.description = description;
        this.host = host;
        groups = new ArrayList<Group>();
    }

    ArrayList<Group> getGroups(){
        return groups;
    }

    String getTitle(){
        return title;
    }

    User getHost(){
        return host;
    }

    String getDescription(){
        return description;
    }
}