Further problem with ArrayLists

Question

Dear all,
I am having trouble with my Java assignment, where we have to create a library system. I have two ArrayLists:
- One to hold objects of type Borrower
- One to hold objects of type Book
These work fine, i can add and delete from them. However, i apparently need to create a third ArrayList where details of the borrowing is held i.e. where the details which borrower has which books.
Can anyone point me in the direction of how i can go about implementing this? Im completely stuck, and do not know where to begin!
Here is my code so far for the classes involved: The borrower and books are super classes, but i dont think i need to give the subclass details....any help is very much appreciated, thank you in advance!
Library class:
import java.util.*;
import java.util.Scanner;
import java.util.Iterator;
* @author Mr. Balls
public class Library {
    private ArrayList bookList = new ArrayList();
    private ArrayList borrowerList = new ArrayList();
    private ArrayList loansList = new ArrayList();
    int totalLoans = 0;
    public Library(ArrayList bookList){
        this.bookList = bookList;
    public Library(){
    public void addBook(){
        String title, author;
        int catNumber, noCopy;
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the title of the book: ");
        title = scan.nextLine();
        System.out.println("Enter the name of the author: ");
        author = scan.nextLine();
        System.out.println("Enter the catalogue number: ");
        catNumber = scan.nextInt();
        System.out.println("Enter the number of copies: ");
        noCopy = scan.nextInt();
        //need to differentiate between standard and reference books here
        bookList.add(new Book(title,author,catNumber,noCopy));
    }//addBook
    public void addBorrower(){
        String name;
        int libNumb, type;
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter borrowers name: ");
        name = scan.nextLine();
        System.out.println("Enter library number: ");
        libNumb = scan.nextInt();
        System.out.println("Enter borrower type ");
        System.out.println("1: Student ");
        System.out.println("2: Lecturer ");
        type = scan.nextInt();
        if(type == 1){
            borrowerList.add(new Student(name, libNumb));
        else{
            borrowerList.add(new Lecturer(name, libNumb));
    public void printBooks(){//temp method to check everything works
        int size;
        size = bookList.size();
        for (int i = 0;i < size;i++){
            System.out.println(bookList.get(i));
        size = borrowerList.size();
        for (int i = 0;i < size;i++){
            System.out.println(borrowerList.get(i));
    public void deleteBook(){
        String searchTitle;
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the book title you wish to delete: ");
        searchTitle = scan.nextLine();
        ListIterator it = bookList.listIterator();
        while(it.hasNext()){
            Book book = (Book) it.next();
            if(book.title.equals(searchTitle)){
                it.remove();
            return;
            }//if
        } //while
    }//deletebook
    public void deleteBorrower(){
        String name;
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the name of the borrower you wish to delete: ");
        name = scan.nextLine();
        ListIterator it = borrowerList.listIterator();
        while(it.hasNext()){
            Borrower borrower = (Borrower) it.next();
            if(borrower.name.equals(name)){
                it.remove();
            return;
            }//if
        } //while
    }//deleteborrower
}//libraryBorrower class:
public class Borrower {
    protected String name;
    protected int libNumb;
    public Borrower(String name, int libNumb){
        this.name = name;
        this.libNumb = libNumb;
    public Borrower(){
    @Override
    public String toString(){
        String result;
        result = "Name: " + name + "\n";
        result += "Library Number: " + libNumb + "\n";
        return(result);
}Book:
public class Book {
    protected String title;
    protected String author;
    protected int catNumber;
    protected int noCopy;
    public Book(String title, String author, int catNumber, int noCopy){
        this.title = title;
        this.author = author;
        this.catNumber = catNumber;
        this.noCopy = noCopy;
    public Book(){
    @Override
    public String toString(){
        String result;
        result = "Title: " + title + "\n";
        result += "Author: " + author + "\n";
        result += "Catalogue number: " + catNumber + "\n";
        result += "Number of copies: " + noCopy + "\n";
        return(result);
}

Answer 1

Well, i got so far as creating a new ArrayList!
What I am struggling with is searching an ArrayList using its inbuilt methods - do i have to use an iterator?
I want to ask the user to input a library number (no probs) then search the Borrowers ArrayList to find the Borrower with that library number. The i want to ask the user to input a book title, search the Book ArrayList and find the book with that title. Finally i want to add the two together to create the borrowing details.
Not much huh :)