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Thread: taking information from one array into another

  1. #1
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    Default 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;
        }
     
    }


  2. #2
    Member samfin's Avatar
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    Default Re: taking information from one array into another

    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.

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