Newbie to java complete message

Question

hi everyone,
I'm a student currently studying IT and now started java. I have been thrown into the deep end and given some java questions to do over the easter period and seem to be struggling. At the moment there is nobody in university to speak to, so thought you guys would be the best solution and was told to use any resources available.
This is what my lecturer wrote word for word and I don't fully understand what it means? Any help would be greatly appreciated...
"Complete the methods as indicated by the comments. A test application has been provided (LibraryTest.java)-your output should match that indicated in the comments.
A book has the following data associated with it; author, title, classmark, whether it is on loan or not and the date it is due to be returned. The classmark has the form LLDD.DD.LDD.LD where L represents a letter and D a digit.
For example: Author: Bruce Eckel
Title:THinking in Java
Classmark: QA76.73.J38.E2
Due: 28th March 08
It should not be possible to change the author, title and classmark fields of a book object after it has been created. It should not be possible to renew Book objects, they muct return before being loaned out again.
*Book.java is the first command:*
// Book.java
// A class to represent a single book stored in the library.
// Each Book is defined by it's author, title and classmark
/* Create and import appropriate packages */
/* Appropriate class declaration */ {
// Define fields with private access
private String author;
private String title;
private String classmark;
private GregorianCalendar due;
private boolean onLoan;
// Creates a new instance of Book
public Book(String inAuthor, String inTitle, String inClassmark) {
/* Complete method */
// Returns true if the book is currently on loan, false otherwise
public boolean isOnLoan() {
/* Complete method */
// Mark the book as being on loan for a specified period (in days)
public void loan(int numOfDays) {
/* Set the due field to be numOfDays later than today's date. Check for any
possible errors in the use of this method. */
// Mark the book as having been returned
public void returnBook() {
/* Complete method */
/* Appropriate accessors and mutators for author, title, classmark */
// Access the date the book is due to be returned. Should return an
// appropriate value if the book is not currently on loan
public GregorianCalendar getDueDate() {
/* Complete method */
// Produce an appropriate string representation of the book object
public String toString() {
/* Complete method */
// An internal method to check whether the classmark is valid
private static boolean isValidClassmark(String inClassmark) {
/* Complete method */
*This is the second part of the program Library.java*
// Library.java
// A class to represent and manipulate a set of books.
/* Create and import appropriate packages */
/* Appropriate class declaration */ {
// Use a Vector to store the books
private Vector books;
// Creates a new Library instance
public Library() {
/* Complete method */
// Add a book to the library
public void add( String author, String title, String classmark ) {
/* Complete method */
// Produce an appropriate string representation of the book object
public String toString( ) {
/* Complete method */
// Access an element of the list
public Book getBook(int i) {
/* Complete method */
// Determine number of books in the library
public int size() {
/* Complete method */
*This is the LibraryTest.java mentioned in the question:*
/* import necessary packages */
public class LibraryTest {
public static void main(String[] args) {
Library lib = new Library();
lib.add("Bruce Eckel", "Thinking in Java", "QA76.73.J38.E2");
System.out.println(lib);
lib.add("Bruce Eckel", "Thinking in C#", "QA76.73.J28.E2");
System.out.println(lib);
lib.getBook(0).loan(7);
System.out.println(lib);
lib.getBook(0).returnBook();
System.out.println(lib);
lib.add("Cay Horstmann","Big Java","QA76.73.J38.E2");
System.out.println(lib);
          System.out.println(lib.size());
          System.out.println(lib.getBook(1));
/* Should produce output similar to:
Bruce Eckel, Thinking in Java, QA76.73.J38.E2 [available]
Bruce Eckel, Thinking in Java, QA76.73.J38.E2 [available]
Bruce Eckel, Thinking in C#, QA76.73.J28.E2 [available]
Bruce Eckel, Thinking in Java, QA76.73.J38.E2 [20/4/2008]
Bruce Eckel, Thinking in C#, QA76.73.J28.E2 [available]
Bruce Eckel, Thinking in Java, QA76.73.J38.E2 [available]
Bruce Eckel, Thinking in C#, QA76.73.J28.E2 [available]
Bruce Eckel, Thinking in Java, QA76.73.J38.E2 [available]
Bruce Eckel, Thinking in C#, QA76.73.J28.E2 [available]
Cay Horstmann, Big Java, QA76.73.J38.E2 [available]
3
Bruce Eckel, Thinking in C#, QA76.73.J28.E2 [available]
Thanks
Chris
Edited by: chris08 on Mar 31, 2008 10:24 PM

Answer 1

Complete the methods as indicated by the comments.Do you understand this bit? If not, what part is confusing you?
A test application has been provided (LibraryTest.java)-your output should match that indicated in the comments.Do you understand this bit? If not, what part is confusing you?
A book has the following data associated with it; author, title, classmark, whether it is on loan or not and the date it is due to be returned.Do you understand this bit? If not, what part is confusing you?
The classmark has the form LLDD.DD.LDD.LD where L represents a letter and D a digit.Do you understand this bit? If not, what part is confusing you?
You have to do some work too. If you don't, guess what? We're not going to do your homework for you.