package book;
public class Book {
  // book的一些基本属性，比如书名，作者，价格，类型，是否被借出   
    private String name;
    private String author;
    private int price;
    private String type;
    private boolean isBorrowed;   //这里isBorrowed初始化就是false，所以不需要在构造方法里初始化了
    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }
  //提高一些get、set方法，方便以后进行查看和修改（因为上面都是用private进行修饰的属性，只能在该类里面访问）
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public boolean isBorrowed() {
        return isBorrowed;
    }
    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }
  //重写toString，以后打印book就会调用该方法
    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                (isBorrowed ? "  已被借出" : "  未被借出") +
                '}';  //注意三目运算符
    }
}

package book;
public class BookList {
    private Book[] books= new Book[10];   //创建一个Book数组，以后存放的书就在这里
    private int size;    //size是记录当前存放书的数目的
    public BookList() {   //初始存放三本书
        books[0] = new Book("三国演义","罗贯中",33,"小说");
        books[1] = new Book("西游记","吴承恩",46,"小说");
        books[2] = new Book("红楼梦","曹雪芹",64,"小说");
        this.size = 3;     //并将size初始化为3
    }
  //提供get与set方法，来查看和改变数组中存放的书
    public Book getBooks(int pos) {
        return books[pos];
    }
    public void setBooks(int pos, Book book) {
        books[pos] = book;
    }
    public int getSize() {
        return size;
    }
    public void setSize(int size) {
        this.size = size;
    }
}

package user;
import book.BookList;
import opera.IOPeration;
public class User {
    protected String name;    //体现封装性，用protected，不同包中的子类也能访问
    protected IOPeration[] ioPerations;  //这个接口数组将来存放的是 实现了该接口的操作方法,根据菜单需求，在两个子类中分别初始化。
    public User(String name) {
        this.name = name;
    }
    public int menu() {  //因为两种用户的菜单不同，所以提供一个方法，供子类根据需求进行重写
        return 0;
    }
    public void work(int m, BookList bookList) {
        this.ioPerations[m].work(bookList);
    }  //这里通过输入m，来控制调用的操作方法
}

package user;
import opera.*;
import java.util.Scanner;
public class AdminUser extends User{
   //通过构造方法来初始化姓名及接口数组（普通用户和管理员的菜单不同，所以要根据需求初始化数组）
    public AdminUser(String name) {
        super(name);
        this.ioPerations = new IOPeration[]{
                new ExitOperation(),   //把0号位置对应退出系统操作
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new ShowOperation()
        };
    }
      //重写父类的menu方法
    public int menu() {
        System.out.println("************************************");
        System.out.println("欢迎" + this.name +"来到图书小练习!");
        System.out.println("1.查找图书");
        System.out.println("2.新增图书");
        System.out.println("3.删除图书");
        System.out.println("4.显示图书");
        System.out.println("0.退出系统");
        System.out.println("************************************");
        System.out.println("请输入你的操作：");
        Scanner scanner = new Scanner(System.in);
        int m = scanner.nextInt();
        return m;     //返回操作数
    }
}

import opera.*;
import java.util.Scanner;
public class NormalUser extends User{
    public NormalUser(String name) {
        super(name);
        this.ioPerations = new IOPeration[]{
                new ExitOperation(),
                new FindOperation(),
                new BrrowOperation(),
                new ReturnOperation()
        };
    }
    public int menu() {
        System.out.println("************************************");
        System.out.println("欢迎" + this.name +"来到图书小练习!");
        System.out.println("1.查找图书");
        System.out.println("2.借阅图书");
        System.out.println("3.归还图书");
        System.out.println("0.退出系统");
        System.out.println("************************************");
        System.out.println("请输入你的操作：");
        Scanner scanner = new Scanner(System.in);
        int m = scanner.nextInt();
        return m;
    }
}

package opera;
import book.BookList;
public interface IOPeration {  //该接口提供了一个work方法
    void work(BookList bookList);  //因为是对BookList进行操作，所以传入该类型参数
}

import book.Book;
import book.BookList;
import java.util.Scanner;
public class AddOperation implements IOPeration{
    @Override     //重写work方法
    public void work(BookList bookList) {
        System.out.println("请输入你要添加的书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入作者：");
        String author = scanner.nextLine();
        System.out.println("请输入类型：");
        String type = scanner.nextLine();
        System.out.println("请输入价格：");
        int price = scanner.nextInt();
        //将这些信息存入变量book中
        Book book = new Book(name,author,price,type);
        for(int i = 0; i < bookList.getSize(); i++) {  //遍历数组，判断是否存在该书
            Book tmp = bookList.getBooks(i);
            if(tmp.getName().equals(name)) {   
                System.out.println("这本书已存在");
                return;
            }
        }        //该书不存在则将该书加入数组中
        bookList.setBooks(bookList.getSize(),book);
        bookList.setSize(bookList.getSize()+1);
    }
}

package opera;
import book.BookList;
import java.util.Scanner;
public class BrrowOperation implements IOPeration {
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for(int i = 0; i < bookList.getSize(); i++) {
           // 借阅图书，不仅得有该书，还得该书处于未被借阅状态
            if(bookList.getBooks(i).getName().equals(name) && !bookList.getBooks(i).isBorrowed()) {
                System.out.println("借阅成功！");
                bookList.getBooks(i).setBorrowed(true);
                return;
            }
        }
        System.out.println("没有该书，请重新选择！");
    }
}

import book.BookList;
import java.util.Scanner;
public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int i = 0;
        for(i = 0; i < bookList.getSize(); i++) {
            if(bookList.getBooks(i).getName().equals(name)) {
                break;  //找到该书后，i即是该书在数组中的下标位置
            }
        }
        if(i < bookList.getSize()) {
            for( ; i < bookList.getSize()-1; i++) {
              //将后面的书往前覆盖，再改变一下size的值即可
                bookList.setBooks(i,bookList.getBooks(i+1));
            }
            bookList.setSize(i);
            System.out.println("删除成功！");
        }else {  //如果i走到了最后，则该书不存在
            System.out.println("没有该书！");
        }
    }
}

package opera;
import book.BookList;
public class ExitOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.exit(0);   //退出程序
    }
}

package opera;
import book.BookList;
import java.util.Scanner;
public class FindOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for(int i = 0; i < bookList.getSize(); i++) {  //遍历查找图书
            if(bookList.getBooks(i).getName().equals(name)) {
                System.out.println("找到了！");
                System.out.println(bookList.getBooks(i));
                return;
            }
        }
        System.out.println("没有该书!");
    }
}

package opera;
import book.BookList;
import java.util.Scanner;
public class ReturnOperation implements IOPeration{
    @Override     //归还图书，类似于借阅图书
    public void work(BookList bookList) {
        System.out.println("请输入书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for(int i = 0; i < bookList.getSize(); i++) {
            if(bookList.getBooks(i).getName().equals(name) && bookList.getBooks(i).isBorrowed()) {
                System.out.println("归还成功！");
                bookList.getBooks(i).setBorrowed(false);
                return;
            }
        }
        System.out.println("没有该书，请重新选择！");
    }
}

package opera;
import book.BookList;
public class ShowOperation implements IOPeration{
    @Override    //显示图书
    public void work(BookList bookList) {
        for(int i = 0; i < bookList.getSize(); i++) {
            System.out.println(bookList.getBooks(i));  //这里调用了我们重写的toString方法
        }
    }
}

import book.BookList;
import opera.IOPeration;
import user.AdminUser;
import user.NormalUser;
import user.User;
import java.util.Scanner;
public class Main {
    public static User login() {
        System.out.println("请输入你的姓名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入你的身份： 1 --> 管理员  2 --> 普通用户");
        int a = scanner.nextInt();
        if(a == 1) {    //这里通过a，来判断身份，并返回一个该身份的对象
            return new AdminUser(name);
        }else {
            return new NormalUser(name);
        }
    }
    public static void main(String[] args) {
        BookList bookList = new BookList();  
        User user = login();   //父类接收身份对象，发生了向上转型和动态绑定
        while(true) {  //选择是循环的，即操作完一次继续操作，直到退出系统
            int m = user.menu();
            user.work(m, bookList);
        }
    }
}