用java设计图书管理系统，且满足以下要求： 1系统主控平台 2用户管理楧块 3借阅管理模块 4 书库管理模块 5读者管理模块，并给出代码

好的，以下是一个简单的Java图书管理系统的代码示例，实现了系统主控平台、用户管理模块、借阅管理模块、书库管理模块和读者管理模块：

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        // 初始化图书馆
        Library library = new Library();

        // 初始化用户
        Admin admin = new Admin("admin", "123456");
        library.addUser(admin);

        // 登录界面
        System.out.println("欢迎使用图书馆管理系统！");
        Scanner scanner = new Scanner(System.in);
        User user = null;
        while (user == null) {
            System.out.print("请输入用户名：");
            String username = scanner.nextLine();
            System.out.print("请输入密码：");
            String password = scanner.nextLine();
            user = library.login(username, password);
            if (user == null) {
                System.out.println("用户名或密码错误，请重新输入！");
            }
        }

        // 主菜单
        while (true) {
            System.out.println("欢迎使用图书馆管理系统，" + user.getUsername() + "！");
            System.out.println("1.借书");
            System.out.println("2.还书");
            System.out.println("3.添加图书");
            System.out.println("4.删除图书");
            System.out.println("5.修改图书");
            System.out.println("6.添加读者");
            System.out.println("7.删除读者");
            System.out.println("8.修改读者");
            System.out.println("9.退出");
            System.out.print("请输入选项：");
            int choice = scanner.nextInt();
            scanner.nextLine();
            switch (choice) {
                case 1:
                    // 借书
                    System.out.print("请输入书名：");
                    String bookName = scanner.nextLine();
                    System.out.print("请输入读者姓名：");
                    String readerName = scanner.nextLine();
                    Book book = library.searchBook(bookName);
                    if (book == null) {
                        System.out.println("图书馆中没有这本书！");
                    } else {
                        Reader reader = library.searchReader(readerName);
                        if (reader == null) {
                            System.out.println("没有找到这位读者！");
                        } else {
                            if (library.borrowBook(book, reader)) {
                                System.out.println("借书成功！");
                            } else {
                                System.out.println("借书失败！");
                            }
                        }
                    }
                    break;
                case 2:
                    // 还书
                    System.out.print("请输入书名：");
                    String bookName2 = scanner.nextLine();
                    System.out.print("请输入读者姓名：");
                    String readerName2 = scanner.nextLine();
                    Book book2 = library.searchBook(bookName2);
                    if (book2 == null) {
                        System.out.println("图书馆中没有这本书！");
                    } else {
                        Reader reader2 = library.searchReader(readerName2);
                        if (reader2 == null) {
                            System.out.println("没有找到这位读者！");
                        } else {
                            if (library.returnBook(book2, reader2)) {
                                System.out.println("还书成功！");
                            } else {
                                System.out.println("还书失败！");
                            }
                        }
                    }
                    break;
                case 3:
                    // 添加图书
                    System.out.print("请输入书名：");
                    String bookName3 = scanner.nextLine();
                    System.out.print("请输入作者：");
                    String author = scanner.nextLine();
                    System.out.print("请输入出版社：");
                    String press = scanner.nextLine();
                    Book newBook = new Book(bookName3, author, press);
                    if (library.addBook(newBook)) {
                        System.out.println("添加图书成功！");
                    } else {
                        System.out.println("添加图书失败！");
                    }
                    break;
                case 4:
                    // 删除图书
                    System.out.print("请输入书名：");
                    String bookName4 = scanner.nextLine();
                    if (library.deleteBook(bookName4)) {
                        System.out.println("删除图书成功！");
                    } else {
                        System.out.println("删除图书失败！");
                    }
                    break;
                case 5:
                    // 修改图书
                    System.out.print("请输入书名：");
                    String bookName5 = scanner.nextLine();
                    Book book5 = library.searchBook(bookName5);
                    if (book5 == null) {
                        System.out.println("图书馆中没有这本书！");
                    } else {
                        System.out.print("请输入新的作者（原作者：" + book5.getAuthor() + "）：");
                        String newAuthor = scanner.nextLine();
                        System.out.print("请输入新的出版社（原出版社：" + book5.getPress() + "）：");
                        String newPress = scanner.nextLine();
                        Book newBook5 = new Book(book5.getName(), newAuthor, newPress);
                        if (library.modifyBook(book5, newBook5)) {
                            System.out.println("修改图书成功！");
                        } else {
                            System.out.println("修改图书失败！");
                        }
                    }
                    break;
                case 6:
                    // 添加读者
                    System.out.print("请输入姓名：");
                    String readerName6 = scanner.nextLine();
                    System.out.print("请输入年龄：");
                    int age = scanner.nextInt();
                    scanner.nextLine();
                    Reader newReader = new Reader(readerName6, age);
                    if (library.addReader(newReader)) {
                        System.out.println("添加读者成功！");
                    } else {
                        System.out.println("添加读者失败！");
                    }
                    break;
                case 7:
                    // 删除读者
                    System.out.print("请输入姓名：");
                    String readerName7 = scanner.nextLine();
                    if (library.deleteReader(readerName7)) {
                        System.out.println("删除读者成功！");
                    } else {
                        System.out.println("删除读者失败！");
                    }
                    break;
                case 8:
                    // 修改读者
                    System.out.print("请输入姓名：");
                    String readerName8 = scanner.nextLine();
                    Reader reader8 = library.searchReader(readerName8);
                    if (reader8 == null) {
                        System.out.println("没有找到这位读者！");
                    } else {
                        System.out.print("请输入新的年龄（原年龄：" + reader8.getAge() + "）：");
                        int newAge = scanner.nextInt();
                        scanner.nextLine();
                        Reader newReader8 = new Reader(reader8.getName(), newAge);
                        if (library.modifyReader(reader8, newReader8)) {
                            System.out.println("修改读者成功！");
                        } else {
                            System.out.println("修改读者失败！");
                        }
                    }
                    break;
                case 9:
                    // 退出
                    System.out.println("感谢使用图书馆管理系统，再见！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选项，请重新输入！");
                    break;
            }
        }
    }
}

// 用户类
abstract class User {
    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }
}

// 管理员类
class Admin extends User {
    public Admin(String username, String password) {
        super(username, password);
    }
}

// 读者类
class Reader extends User {
    private int age;

    public Reader(String username, int age) {
        super(username, "123456");
        this.age = age;
    }

    public int getAge() {
        return age;
    }
}

// 图书类
class Book {
    private String name;
    private String author;
    private String press;
    private boolean borrowed;

    public Book(String name, String author, String press) {
        this.name = name;
        this.author = author;
        this.press = press;
        this.borrowed = false;
    }

    public String getName() {
        return name;
    }

    public String getAuthor() {
        return author;
    }

    public String getPress() {
        return press;
    }

    public boolean isBorrowed() {
        return borrowed;
    }

    public void setBorrowed(boolean borrowed) {
        this.borrowed = borrowed;
    }
}

// 图书馆类
class Library {
    private ArrayList<User> users;
    private ArrayList<Book> books;
    private ArrayList<Reader> readers;

    public Library() {
        this.users = new ArrayList<>();
        this.books = new ArrayList<>();
        this.readers = new ArrayList<>();
    }

    public boolean addUser(User user) {
        return users.add(user);
    }

    public User login(String username, String password) {
        for (User user : users) {
            if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
                return user;
            }
        }
        return null;
    }

    public boolean addBook(Book book) {
        return books.add(book);
    }

    public boolean deleteBook(String name) {
        Book book = searchBook(name);
        if (book == null) {
            return false;
        } else {
            return books.remove(book);
        }
    }

    public boolean modifyBook(Book oldBook, Book newBook) {
        int index = books.indexOf(oldBook);
        if (index == -1) {
            return false;
        } else {
            books.set(index, newBook);
            return true;
        }
    }

    public Book searchBook(String name) {
        for (Book book : books) {
            if (book.getName().equals(name)) {
                return book;
            }
        }
        return null;
    }

    public boolean borrowBook(Book book, Reader reader) {
        if (book.isBorrowed()) {
            return false;
        } else {
            book.setBorrowed(true);
            return true;
        }
    }

    public boolean returnBook(Book book, Reader reader) {
        if (book.isBorrowed()) {
            book.setBorrowed(false);
            return true;
        } else {
            return false;
        }
    }

    public boolean addReader(Reader reader) {
        return readers.add(reader);
    }

    public boolean deleteReader(String name) {
        Reader reader = searchReader(name);
        if (reader == null) {
            return false;
        } else {
            return readers.remove(reader);
        }
    }

    public boolean modifyReader(Reader oldReader, Reader newReader) {
        int index = readers.indexOf(oldReader);
        if (index == -1) {
            return false;
        } else {
            readers.set(index, newReader);
            return true;
        }
    }

    public Reader searchReader(String name) {
        for (Reader reader : readers) {
            if (reader.getUsername().equals(name)) {
                return reader;
            }
        }
        return null;
    }
}

请注意，这只是一个简单的示例，可能并不完美。在实际使用中，您需要根据具体需求进行修改和完善。