Passing different parameters to a method?

Question

Hi,
I am having trouble with a method I created that is supposed to take two Book objects
and copy the variables of one object into the other object. One of the objects
is just a plain Book object while the other is a Book[ ] object (i.e. an element in an
array). I'm sure my syntax is off along with other mistakes. Can anyone offer
suggestions? Here is the code below with the 2 classes. The trouble area
is in bold.
Thank you in advance,
M
public class BookTest {
    static Scanner console = new Scanner(System.in);
    public static void main(String[] args) {
        String title;
        String pub;
        int isbn = 0;
        int nAuthors = 0;
        double price = 0;
        int copies = 0;
        Book text1 = new Book(); // create a book with the default
                                 // constructor
     String[] authors = new String[8]; // create an array to store
                                          // the authors
     // test out the different methods of the Book class
        text1.setTitle("The longest yard");
        text1.setAuthors(authors);
        text1.setPub("Ignatius Press");
        text1.setISBN(22345);
        text1.setPrice(65.00);
        text1.setCopies(100);
        text1.setNumAuth(3);
     // create a library of 100 Book objects
        Book[] bookLibrary = new Book[100];
        for(int i = 0; i < bookLibrary.length; i++)
            bookLibrary[i] = new Book();
        // copy text1 and text2 into the index 0 and 1 of library
        *bookLibrary[0].bookCopy(bookLibrary[0], text1);*
public class Book {
    private String title, publisher;
    private int ISBN, numCopies, numAuthors;
    private double price;
    private String[] authors;
    private Book obj[];
    public Book() {
      authors = new String[8];
      title = "";
      publisher = "";
      ISBN = 0;
      price = 0;
      numCopies = 0;
      numAuthors = 0;  
    public Book(String titl, String[] auth, String pub,
            int isbn, double pr, int copies, int noAuthors) {
        title = titl;
        authors = auth;
        publisher = pub;
        ISBN = isbn;
        price = pr;
        numCopies = copies;
        numAuthors = noAuthors;
    public void setTitle(String titl) {
        title = titl;
    public String getTitle() {
        return title;
    public void setCopies(int copies) {
        numCopies = copies;
    public int getCopies() {
        return numCopies;
    public void setPub(String pub) {
        publisher = pub;
    public String getPublisher() {
        return publisher;
    public void setISBN(int isbn) {
        ISBN = isbn;
    public int getISBN() {
        return ISBN;
    public void setPrice(double pr) {
        price = pr;
    public double getPrice() {
        return price;
    public void setAuthors(String[] auth) {
        authors = auth;
    public String getAuthor() {
        String output = "";
        for(int i = 0; i <= getNumAuth() - 1; i++) {
            output = output + authors[i] + " ";
        return output;
    public void setNumAuth(int num) {
        numAuthors = num * 2;
    public int getNumAuth() {
        return numAuthors;
    *public static void bookCopy(Book obj1, Book obj2)* {
obj1[i].setTitle(obj2.title);
obj1[i].setAuthors(obj2.authors);
obj1[i].setPub(obj2.publisher);
obj1[i].setISBN(obj2.ISBN);
obj1[i].setPrice(obj2.price);
obj1[i].setCopies(obj2.numCopies);
obj1[i].setNumAuth(obj2.numAuthors);

Answer 1

No need to specify that the book is in an array when creating the method. Just make it
*public static void bookCopy(Book obj1, Book obj2)* {
        obj1.setTitle(obj2.title);
        //set the rest of the stuff here
}You can then call it with
Book.bookCopy(books, aBook);