Thread: taking information from one array into another

I have 2 arrays that store members and books in a library, i want to use a 3rd array to take information out of those arrays. E.g take one member and one book and put them in one "Loan" slot to represent a member borrowing a book.

Here is all my code

Any help would be much appreciated.

Thanks

import java.util.ArrayList;
/**
 * Write a description of class Library here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Library
{
 ArrayList<Membership> member;
 ArrayList<Books> book;
 ArrayList<Loans>loan;
 
 private int nextMemberID;
 private int nextBookId;
 private int nextLoanId;
 
    /**
     * Constructor for objects of class Library
     */
    public Library() 
    {
 
       nextMemberID = 1;
       nextBookId = 1; 
       nextLoanId = 1;
 
       member = new ArrayList<Membership>();
       book = new ArrayList<Books>();
       loan = new ArrayList<Loans>();
 
    }
 
     /**
     * Return the lot with the given number. Return null
     * if a lot with this number does not exist.
     * @param lotNumber The number of the lot to return.
     */
    public void addnewMember( String first, String last, String telephone)
    {
 
    member.add(new Membership(nextMemberID,first,last,telephone));
    nextMemberID++; 
}
 
[SIZE="3"][B]public void addnewLoan(  )
{
    loans.add(new Loans();[/B][/SIZE]   
 
}
 
public void listMembers()
{
     for(Membership membership : member) {
 
         System.out.println(membership.toString());
 
        }
 
 
}
 
 public void getMemberDetails(int ID)
    {
        for(Membership membership : member) {
            if(membership.getID() == ID){
                System.out.println (membership);
 
        }
        }
        // if ID number does not exist then do nothing
    }
 
    public void getBookDetails(int bookid)
    {
        for(Books books : book) {
            if(books.getBookid() == bookid){
                System.out.println (books);
 
        }
        }
        // if ID number does not exist then do nothing
    }
 
 
 
 
 
        /**
     * Return the lot with the given number. Return null
     * if a lot with this number does not exist.
     * @param lotNumber The number of the lot to return.
     */
    public Membership getMember(int ID)
    {
        for(Membership membership : member) {
            if(membership.getID() == ID){
                return membership;
            } else if (membership.getID() > ID) {
                System.out.println("Lot number: " + ID +
                                            "does not exist.");
 
 
            }
 
        }
            return null; //if there are no lots
    }
 
    /**     * Remove the lot with the given lot number. 
   * @param number The number of the lot to be removed   
   * @return The Lot with the given number, or null if 
   * there is no such lot.  
   */  
 
 
    public void removeMember(int ID) {
 
    //First we find the lot with the given number
    Membership membership = getMember(ID);
    if (membership != null) {
        //Then we can use the method remove with lot as argument
       member.remove(membership);
 
 
    }
 
}
 
 
 
 
 
     /**
     * Return the lot with the given number. Return null
     * if a lot with this number does not exist.
     * @param boolean fiction IS the book fiction true or false.
     */
     public void addnewBook( String title, String author, boolean fiction)
    {
 
    book.add(new Books(nextBookId,title,author,fiction));
    nextBookId++; 
}
 
 
public void listBooks()
{
     for(Books books : book) {
 
         System.out.println(books.toString());
 
        }
 
 
    }
 
 
 
 
    public Books getBookid(int bookid)
    {
        for(Books books : book) {
            if(books.getBookid() == bookid){
                return books;
            } else if (books.getBookid() > bookid) {
                System.out.println("Lot number: " + bookid +
                                            "does not exist.");
 
 
            }
 
        }
            return null; //if there are no lots
    }
 
 
      public void removeBook(int bookid) {
 
    //First we find the lot with the given number
    Books books = getBookid(bookid);
    if (books != null) {
        //Then we can use the method remove with lot as argument
       book.remove(books);
 
 
    }
 
}
 
 
 
public void searchForLastName(String lastname) { 
        int index = 0;   
        boolean found = false;    
     for(Membership membership : member) {  
    if(membership.getlastName().contains(lastname)) {     
 
 
        found = true;        }        
     else {     
         index++;        }  
 
 
    if(found) {    
 
    System.out.println (membership); 
 
      } else {   
 
      // if no matches are found then do nothing 
 
    }
 
}
 
 
}
 
public void searchForBookTitle(String booktitle) { 
        int index = 0;   
        boolean found = false;    
     for(Books books : book) {  
    if(books.gettitle().contains(booktitle)) {     
 
 
        found = true;        }        
     else {     
         index++;        }  
 
 
    if(found) {    
 
    System.out.println (books); 
 
      } else {   
 
      // if no matches are found then do nothing 
 
    }
 
}
 
}
 
}

public class Books
{
    // instance variables - replace the example below with your own
    private final int bookid;
    private String title;
    private String author;
    private boolean fiction;
 
    /**
     * Constructor for objects of class Booklist
     */
    public Books(int Id, String title, String author, boolean fiction)
    {
       this.bookid = Id;
       this.title = title;
       this.author = author;
       this.fiction = fiction; 
 
    }
 
     /**
     * @return The lot's number.
     */
    public int getBookid()
    {
        return bookid;
    }
 
    public String gettitle()
    {
       return title;
 
    }
 
 
 
    public String toString()
    {
        String details = bookid + ":   <<<Book ID      :Title " + title + "    :Author " + author + "       :Is the book fiction - True or False?    "+ fiction;
 
       return details;
    }
}

public class Membership
{
 
    private String firstName;
    private String lastName;
    private String telephoneNumber;
    private int ID;
 
 
    /**
     * Constructor for objects of class Member
     */
    public Membership(int ID, String first, String last, String telephone)
    {
       this.ID = ID;
       this.firstName = first;
       this.lastName = last;
       this.telephoneNumber = telephone;
 
 
    }
 
    /**
     * @return The lot's number.
     */
    public int getID()
    {
        return ID;
    }
 
    public String getlastName()
    {
       return lastName;
 
    }
 
 
 
 
    public String toString()
    {
        String details = ID + ":   <<<Membership ID      :First Name " + firstName + "    :Second Name " + lastName + "    :Telephone Number " + telephoneNumber;
 
       return details;
    }
 
}

Do you mean something like a HashMap where you could have the member as the key and the book as the value or vice versa like this?

HashMap<Books,Membership> loans = new HashMap<Books,Membership>();
loans.put(member.get(0),book.get(0);

Or whichever members and books you want in there. Not sure if I've missed the point here.