Storing undefined amount of objects into array

I have been looking at my code, along with numerous other examples and none of it is making sense to me. I am not in school and this is not a project for anything in particular. I am just trying to learn on my own and sometimes what I read doesn't make sense. Hopefully someone here can enlighten me a little on this issue.

SETUP: I have a start to a basic medical emergency program. At the beginning it asks if it is an emergency or if you want to enter information to store. So I started out with the Doctor class. I want to be able to store into an array, doctor objects that get created on the fly, then when a person says that it IS an emergency, I wanted that array[] to print out to show all the doctors, medications, etc.

SO FAR: I have a main, and a Doctor class. The other lines have been commented out as they have not been created yet. I am able to create a doctor as I expected, but storing it into an array is confusing me.

Hell, I don't even know if what I have so far is the best way to go about everything, though it does work to an extent.

Doctor

Code:

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package medicalrx;
import java.util.Scanner;

public class Doctor
{               
          Scanner scan = new Scanner(System.in);
          String docName; // ********************************************************          Dr. name
          String aStreet; // ***********************************************************          Street Address
          String aCityState; // *******************************************************          City State
          String phone; // ************************************************************          Phone
         
          public void setDoctor()
          {
                    System.out.println("Doctor name -");
                    docName = scan.nextLine();
                    System.out.println("Street Address -");
                    aStreet = scan.nextLine();
                    System.out.println("City, State ZIP -");
                    aCityState = scan.nextLine();
                    System.out.println("Phone Number");
                    phone = scan.nextLine();
            }     
          public  String getDoctor()
          {
                    {return ("Dr. " + docName + "\nAddress: \n" + aStreet + "\n" + aCityState + "\n" + "Phone Number: "  + phone);}
          }
}

---

MAIN

Code:

---

package medicalrx;

import java.util.Scanner;
         
public class MedicalEmergency
{
          public static void main(String[] args)
          {
                    System.out.println("\n\n\n*********************");
                    System.out.print("NOTE:");
                    System.out.println("This program CANNOT dial 9-1-1 or any other emergency number.");
                    System.out.println("If you have a real emergency, please contact 9-1-1 or your local emergency hotline.");
                    System.out.println("");
                    System.out.print("Is this an EMERGENCY ?");                             
                    System.out.println(" - (Y)es - (N)o - (E)nter information");
                    Scanner scan = new Scanner(System.in);
                    String input1 = scan.next(); //////////////////////////////////////////////////////////////////////////////////////////////////////////////                  SCANNER
                   
                    if(input1.equalsIgnoreCase("N")) // *********************************************(N)O - NOT an emergency
                    {
                              System.out.println("Accidents Happen. Be Careful!");

                    }
                    else if(input1.equalsIgnoreCase("Y")) // *****************************************(Y)ES - IS EMERGENCY
                    {
                              System.out.println("*************************************************************");
                              System.out.println("This program can display the following information");
                              System.out.println("(1) - DOCTOR(S)\n(2) - CONDITION(S) / DISEASE(S)\n(3) - CURRENT MED(S)\n(4) - KNOWN ALLERGIES\n(5) - EMERCENY CONTACT");
                              System.out.println("Please type a number to pull up that directory -");
                              int input2 = scan.nextInt(); ///////////////////////////////////////////////////////////////////////////////////////////////////////              SCANNER
                             
                              if(input2==1)
                              {
                                        System.out.println("DOCTORS-");
                                        System.out.println("Doctors Name");
                                        System.out.println("Address 1");
                                        System.out.println("Address 2");
                                        System.out.println("Phone Number");
                                                                   
                              }
                    }
                    else if(input1.equalsIgnoreCase("E")) //******************************************** (E)NTER NEW USER DATA
                    {
                              System.out.println("\n\n******************************");
                              System.out.println("ADD NEW:");
                              System.out.println("(1) Doctor");
                              System.out.println("(2) Condition / Disease");
                              System.out.println("(3) Medication");
                              System.out.println("(4) Allergy");
                              System.out.println("(5) Emergency Contact");
                              int input3 = scan.nextInt(); ////////////////////////////////////////////////////////////////////////////////////////////////        SCANNER
                             
                              if(input3==1)
                              {
                                        int addAnother = 1;
                                       
                                        while(addAnother==1)
                                        {
                                        System.out.println("\n\n\n************ Add New Doctor");
                                        Doctor doctor = new Doctor();
                                        doctor.setDoctor();
                                        System.out.println("Add another Doctor ? (Y) / (N)");
                                        String addDoc = scan.next();
                                       
                                        if(addDoc.equalsIgnoreCase("N"))
                                        {
                                            addAnother = 0;     
                                        }
                                          else if(addDoc.equalsIgnoreCase("Y"))
                                          {
                                                    addAnother = 1;
                                          }
                                                  else
                                                  {
                                                            System.out.println(
                                                  }
                                        }
                              } 
//                              else if(input3==2)
//                              {
//                                        System.out.println("\n\n\n************ Add New Condition / Disease");
//                                        Condition condition = new Condition();
//                                        condition.setCondition();
//                              }
//                              else if(input3==3)
//                              {
//                                        System.out.println("\n\n\n************ Add New Condition / Disease");
//                                        Medication medication = new Medication();
//                                        medication.setMedication();
//                              }
//                              else if(input3==4)
//                              {
//                                        System.out.println("\n\n\n************ Add New Condition / Disease");
//                                        Allergy allergy = new Allergy();
//                                        allergy.setAllergy();
//                              }
//                              else if(input3==5)
//                              {
//                                        System.out.println("\n\n\n************ Add New Condition / Disease");
//                                        Contact contact = new Contact();
//                                        contact.setContact();
//                                }
                    }
                    else
                    {
                              System.out.println("Is this an Emergency, (Y) or (N) ?"); // ****************************ASK IF EMERGENCY AGAIN
                              input1 = scan.next();
                    }
          }
}

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I have been wanting to switch to Eclipse to see if that would help me out any in regards to autofilling certain areas, but as of yet I am still coding in Dr. Java until I can get more basics down.

Can you explain what your problem(s) are?

One suggestion: You could use a switch() statement instead of the chain of if/else if statements

Code:

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package medicalrx;

public class DoctorList
          {
          public static Doctor[] doctorList = new Doctor[10];
          private int i = 0;
         
          public void add(Doctor doctor)
          {
                    if(i<doctorList.length)
                    {
                              doctorList[i]=doctor;
                              System.out.println("Doctor Added at index: " + i);
                              i++;
                    }
          }
}

---

I think I found some code somewhere to study and break down. As for question though, I am still confused on printing out the information (getDoctor) when I call the list of Doctors up. I see the memory slots and null's but I havent looked to deep into this though. Thanks for the switch() information. Off to read some more.

Quote:

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printing out the information (getDoctor) when I call the list of Doctors up. I see the memory slots and null

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The default value for a variable like String is null and for slots in an array. Make sure all the variables are assigned a value.