how to fix this error?

Question

Main.java:12: error: class Receptionist is public, should be declared in a file named Receptionist.java
public class Receptionist extends javax.swing.JFrame {
       ^
Main.java:7: error: package Receptionists does not exist
import Receptionists.ReceptionistActivity;
                    ^
Main.java:115: error: cannot find symbol
        Hospital hospital = new Hospital();
        ^
  symbol:   class Hospital
  location: class Receptionist
Main.java:115: error: cannot find symbol
        Hospital hospital = new Hospital();
                                ^
  symbol:   class Hospital
  location: class Receptionist
Main.java:121: error: cannot find symbol
        connection = Connector.ConnectDb();
                     ^
  symbol:   variable Connector
  location: class Receptionist
Main.java:130: error: cannot find symbol
                ReceptionistActivity rActivity = new ReceptionistActivity();
                ^
  symbol:   class ReceptionistActivity
  location: class Receptionist
Main.java:130: error: cannot find symbol
                ReceptionistActivity rActivity = new ReceptionistActivity();
                                                     ^
  symbol:   class ReceptionistActivity
  location: class Receptionist
Main.java:133: error: cannot find symbol
                ReceptionistActivity.username = username;
                ^
  symbol:   variable ReceptionistActivity
  location: class Receptionist

Answer 1

I'm no java expert but I assume you didn't import files containing these classes into your main file. If a program can't find some symbol then it means it cannot see it - sometimes it's because the name used doesn't match up 100% and sometimes it's because of some missed import.

Answer 2

it maight be that the functions or the symbol that you have used were not declared or in the standard library.