Unable to put in one of the elements from another arraylist into another class(Resolved)

[Jon Kho]

Dear all, I have a problem taking selected elements from 2 different arraylists placed in each class.. i am currently unable to put in one of the elements from another arraylist..
Desired output
Account Number Balance Customer Name
1001 100.0 Jack
1023 200.0 Rob
1729 300.0 Jon

The codes..

import java.util.ArrayList;

public class MainArray {

   
    public static void main(String[] args) {

        ArrayList<BankAccount> accounts = new ArrayList<BankAccount>();
        accounts.add(new BankAccount(1001, 100.0));
        accounts.add(new BankAccount(1023, 200.0));
        accounts.add(new BankAccount(1729, 300));


   System.out.println("Account Number   Balance:    Customer Name ");
    for(int i =0; i< accounts.size(); i++){
    BankAccount ba1 = accounts.get(i);

    System.out.println(accounts.getAccountNumber()+ accounts.getBalance());// i would wann to add in the customer's name.. by using "getName()" it does not allow me to do it.. 
    }
    }
}

public class CustomerList {


    private ArrayList<Customer> listCusts;

public CustomerList(){

    listCusts = new ArrayList();
    listCusts.add(new Customer("C0", "Barry"));
    listCusts.add(new Customer("C1", "Duffman");
    listCusts.add(new Customer("C2", "Jeff"));

}

public class Customer {

    private String cID;
    private String cName;

public Customer(String id, String name{

        cID = id;
        cName = name; 
    }

 public String getID(){
 return cID;
 }
 public String getName(){
 return cName;
 }
}

public class BankAccount {

    private int accountNumber;
    private double balance;
    
    public BankAccount(int anAccountNumber){ //read about this.. why need to put another int varaible?
    accountNumber = anAccountNumber;
    balance = 0;
    }

    public BankAccount(int anAccountNumber, double initialBalance){
    accountNumber = anAccountNumber;
    balance = initialBalance;
    }

    public int getAccountNumber(){
    return accountNumber;
    }


    public double getBalance(){
    return balance;
    }
}

Now currently i can get the output that i wanted this way...

import java.util.ArrayList;

public class MainArray {
   
    public static void main(String[] args) {

        ArrayList<BankAccount> accounts = new ArrayList<BankAccount>();
        accounts.add(new BankAccount(1001, 100.0));
        accounts.add(new BankAccount(1023, 200.0));
        accounts.add(new BankAccount(1729, 300));

           ArrayList name = new ArrayList();
           name.add("Jack");
           name.add("Rob");
           name.add("Jon");
           
        BankAccount first = accounts.get(0);
        System.out.println("First Account Number: " + first.getAccountNumber() +
                " First Account Balance: " + "$"+ first.getBalance() + "    Owner is: " + name.get(0));

        BankAccount second = accounts.get(1);
        System.out.println("Second Account Number: " + second.getAccountNumber()+
                " Second Account Balance: " + "$"+ second.getBalance() + "      Owner is: " + name.get(1));

        BankAccount last = accounts.get(accounts.size() -1);
        System.out.println("Last Account Number: " + last.getAccountNumber()+
                " Last Account Balance: " + "$"+ last.getBalance() + "      Owner is: " + name.get(2));
    }
}

but the problem is that customer's arraylist is in another class and i am unable to retrive the info and put it into another different class..

Any help or comments on this topic would be great..

Thanks

Regards,
Jon

[Balu Sadhasivam]

Jon,

Use packages please for classes. especially when you have related classes, it makes your life easy to manage and add classes.

How abt including a Customer reference id to a BankAccount class. So for each bank account a customer is defined and one customer can have more than one account.

accounts.add(new BankAccount(1001, 100.0));

When you create a account , you include the Customer id no too. when you need Customer name ( any other info)

# public CustomerList(){  
#   
#     listCusts = new ArrayList();  
#     listCusts.add(new Customer("C0", "Barry"));  
#     listCusts.add(new Customer("C1", "Duffman");  
#     listCusts.add(new Customer("C2", "Jeff"));  
#   
# }  

Use map instead of List. with CustId as key , it would be easy to retrieve Customer information.

CustId = accounts.get(0).getCustomerID();

//here customerMap is used to fetch customer object
customerObj = customerMap.get(CustId);
customerObj.getName(); // to get Cust name

[Jon Kho]

Balu Sadhasivam wrote:
Use map instead of List. with CustId as key , it would be easy to retrieve Customer information.

CustId = accounts.get(0).getCustomerID();

//here customerMap is used to fetch customer object
customerObj = customerMap.get(CustId);
customerObj.getName(); // to get Cust name

Hi Balu,
Fthank you for commenting on this topic.

can I presume that you are referring to hashmap for my problem? After reading the example on hashmap from here.
It seems that i have to create another "map" which is almost similar to arraylist..
ashMap hm = new HashMap();
hm.put("Rohit", new Double(3434.34));
hm.put("Mohit", new Double(123.22));
hm.put("Ashish", new Double(1200.34));
hm.put("Khariwal", new Double(99.34));
hm.put("Pankaj", new Double(-19.34));
Now the challenge for me is to use different elements from two existing arraylists and the coding which i have now does not seems to work(or rather do not allow me to put in the codes that i wanted).

  System.out.println("Account Number   Balance:    Customer Name ");  
   for(int i =0; i< accounts.size(); i++){  
  BankAccount ba1 = accounts.get(i);  
   
     System.out.println(accounts.getAccountNumber()+ accounts.getBalance());// i would wann to add in the customer's name.. by using "getName()" it does not allow me to do it..   
    }  
    }  

Thanks

Regards,
Jon

[Balu Sadhasivam]

It seems that i have to create another "map" which is almost similar to arraylist..
ashMap hm = new HashMap();
hm.put("Rohit", new Double(3434.34));
hm.put("Mohit", new Double(123.22));
hm.put("Ashish", new Double(1200.34));
hm.put("Khariwal", new Double(99.34));
hm.put("Pankaj", new Double(-19.34)); 

Why do you need another map? a single map with Customer object as value and CustId as key would solve the problem.

[Jon Kho]

Dear all,

I have managed to merge the 2 array lists together using the coding shown below under listBookings.

import java.util.*;

public class MovieStore {

        private ArrayList<Customer> listCusts;
        private ArrayList<Movie> listMovies;
        private ArrayList<BookingInfo> listBookings;
        Scanner sc = new Scanner(System.in);

   public VideoStore(){
    // This arraylist holds the Customers records
    Customer cust0 = new Customer("C0", "Jim Carry", "123456");
    Customer cust1 = new Customer("C1", "Raymond Newman", "234567");
    Customer cust2 = new Customer("C2", "Jack Tan", "3456789");

    listCusts = new ArrayList();
    listCusts.add(cust0);
    listCusts.add(cust1);
    listCusts.add(cust2);

    // This arraylist holds the video records
    Movie movie0 = new Movie(100, "The Matrix 3", "Good");
    Movie movie1 = new Movie(101, "Lady Killers 3", "Good");
    Movie movie2 = new Movie(102, "Creepers 2", "Bad");

    listMovies = new ArrayList();
    listMovies.add(movie0);
    listMovies.add(movie1);
    listMovies.add(movie2);
   
    listBookings = new ArrayList();
    listBookings.add(new BookingInfo(cust0, movie0));
    listBookings.add(new BookingInfo(cust1, movie1));
    listBookings.add(new BookingInfo(cust0, movie2));

       
        } 

But I am facing a problem adding into the 3rd arraylist with new information...
Here is the coding for the BookingInfo

public class BookingInfo {
 private int bookID;
 private static int ID =0;
 
 private Movie movie;
 private Customer cust;

public BookingInfo(Customer c, movie m){
    hireID = ID++;
   cust = c;
    movie = m;
}

public String toString()
    {
      String info = bookID + "\t  " + movie.getMovieTitle() + "\t" + cust.getName();
      return info;
    }
   
   }

now currently i am able to display the 3rd array list contents.

Any help or comments on this topic would be great.
(Note: I tried using Hash maps, but there is not much information for me to learn it. Hence i am force to use this method. Thanks)

Regards,
Jon

[Jon Kho]

Dear all, i managed to resolved this.. it's my bad from being careless..

 import java.util.*;  
     
   public class MovieStore {  
     
           private ArrayList<Customer> listCusts;  
           private ArrayList<Movie> listMovies;  
           private ArrayList<BookingInfo> listBookings;  
           Scanner sc = new Scanner(System.in);  
// just shift it here to resolve
      Customer cust0 = new Customer("C0", "Jim Carry", "123456");  
       Customer cust1 = new Customer("C1", "Raymond Newman", "234567");  
       Customer cust2 = new Customer("C2", "Jack Tan", "3456789");  
// just shift it here to resolve
   Movie movie0 = new Movie(100, "The Matrix 3", "Good");  
       Movie movie1 = new Movie(101, "Lady Killers 3", "Good");  
       Movie movie2 = new Movie(102, "Creepers 2", "Bad");  

      public VideoStore(){  
       // This arraylist holds the Customers records  
      
     
       listCusts = new ArrayList();  
       listCusts.add(cust0);  
       listCusts.add(cust1);  
       listCusts.add(cust2);  
     
       // This arraylist holds the video records  
    
     
       listMovies = new ArrayList();  
       listMovies.add(movie0);  
       listMovies.add(movie1);  
       listMovies.add(movie2);  
        
       listBookings = new ArrayList();  
       listBookings.add(new BookingInfo(cust0, movie0));  
       listBookings.add(new BookingInfo(cust1, movie1));  
       listBookings.add(new BookingInfo(cust0, movie2));  
     
            
          }   

Thanks