Java图书馆借阅功能实现

某镇上有两个图书馆，请按照下面要求及提示帮助这两个图书馆实现图书电子借阅。

完成Library.java，该类中的main()方法已经给出。但类成员和类方法需要完善。完成该类的时候请注意以下要求：

 Ａ.该类中有类成员方法，也有实例成员方法；

 B. 不能改变main()方法的内容。

 Ｃ.main( )方法的输出为：

   Library hours:

   Libraries are open daily from 9am to 5pm.

   Library addresses:

   10 Main St.

   228 Liberty St.

  Borrowing The Lord of the Rings:

  You successfully borrowed The Lord of the Rings

  Sorry, this book is already borrowed.

  Sorry, this book is not in our catalog.

 Books available in the first library:

 The Da Vinci Code

 Le Petit Prince

 A Tale of Two Cities

Books available in the second library:

No book in catalog

Returning The Lord of the Rings:

You successfully returned The Lord of the Rings

Books available in the first library:

The Da Vinci Code

Le Petit Prince

A Tale of Two Cities

The Lord of the Rings

import java.util.ArrayList;
 
/**
 * @version 1.0
 */
public class Library {
    // Add the missing implementation to this class
    String Library_title;
 
    public static class Book {
 
        String title;
        boolean borrowed;
 
        public Book(String title) {
            this.title = title;
            borrowed = false;
        }
    }
 
    //Book[] books = new Book[6];
    ArrayList<Book> books= new ArrayList<>();
 
    public Library(String library_title) {
        Library_title = library_title;
       // books = new Book[6];
    }
 
    public void addBook(Book book) {
//        Book_num++;
//        books[Book_num].title = book.title;
//        books[Book_num].borrowed = book.borrowed;
        books.add(book);
    }
 
    public static void printOpeningHours() {
        System.out.println("Libraries are open daily from 9am to 5pm.");
    }
 
    public void printAddress() {
        System.out.println(Library_title);
    }
 
    public void borrowBook(String name) {
        int i;
        for (i = 0; i < books.size(); i++) {
            if (name.equals(books.get(i).title)) {
                break;
            }
        }
        if (i == books.size()) {
            System.out.println("Sorry, this book is not in our catalog.");
        } else {
            if (!books.get(i).borrowed) {
                System.out.println("You successfully borrowed The Lord of the Rings");
                books.get(i).borrowed = true;
            } else {
                System.out.println("Sorry, this book is already borrowed.");
            }
        }
    }
 
    public void printAvailableBooks(){
        int i,j=0;
        for(i=0;i<books.size();i++){
            if(!books.get(i).borrowed){
                System.out.println(books.get(i).title);
                j++;
            }
        }
        if(j==0){
            System.out.println("No book in catalog");
        }
    }
    public void returnBook(String name){
        int i;
        for (i = 0; i < books.size(); i++) {
            if (name.equals(books.get(i).title)) {
                break;
            }
        }
        if (i == books.size()) {
            System.out.println("Sorry, this book is not in our catalog.");
        } else {
                System.out.println("You successfully returned "+name);
                books.get(i).borrowed = false;
        }
    }
 
 
    public static void main(String[] args) {
        // Create two libraries
        Library firstLibrary = new Library("10 Main St.");
        Library secondLibrary = new Library("228 Liberty St.");
 
        // Add four books to the first library
        firstLibrary.addBook(new Book("The Da Vinci Code"));
        firstLibrary.addBook(new Book("Le Petit Prince"));
        firstLibrary.addBook(new Book("A Tale of Two Cities"));
        firstLibrary.addBook(new Book("The Lord of the Rings"));
 
        // Print opening hours and the addresses
        System.out.println("Library hours:");
        printOpeningHours();
        System.out.println();
 
        System.out.println("Library addresses:");
        firstLibrary.printAddress();
        secondLibrary.printAddress();
        System.out.println();
 
        // Try to borrow The Lords of the Rings from both libraries
        System.out.println("Borrowing The Lord of the Rings:");
        firstLibrary.borrowBook("The Lord of the Rings");
        firstLibrary.borrowBook("The Lord of the Rings");
        secondLibrary.borrowBook("The Lord of the Rings");
        System.out.println();
 
        // Print the titles of all available books from both libraries
        System.out.println("Books available in the first library:");
        firstLibrary.printAvailableBooks();
        System.out.println();
        System.out.println("Books available in the second library:");
        secondLibrary.printAvailableBooks();
        System.out.println();
 
        // Return The Lords of the Rings to the first library
        System.out.println("Returning The Lord of the Rings:");
        firstLibrary.returnBook("The Lord of the Rings");
        System.out.println();
 
        // Print the titles of available from the first library
        System.out.println("Books available in the first library:");
        firstLibrary.printAvailableBooks();
    }
}