目录
详解：
BookList类：
InOperation接口
User类（父类）和 Main类（这俩要一起看）
完整代码
book包
Book类
BookList类
operation包
AddBook类
BorrowBook类
DeleteBook类
FindBook类
PrintBook类
ReturnBook类
Exit类
InOperation接口
user包
Domestic类
Administrator类
User类
Main类
详解：
按照上图逻辑来写， 因为要运行，所以要有个main函数
接下来我们来串联整个思路
接下来细说BookList类，InOperation接口和User类
BookList类：
1.先创建一个Book类 类型的数组（private 封装）
2.再创建个书的个数的变量 （private 封装），然后创建构造方法,初始化成员（图书）（实例化BookList时直接就运行书架里的内容）（实例化一个Book对象，有参类型，所以Book类哪里要先创建有参的构造方法）
既然封装了就要有Getter和Setter(下面系统自动生成步骤)
当然自动生成的和我们要的还是有点差别的，我们要稍微改动一下
InOperation接口
因为每一个操作功能都要有对应的工作，所以干脆创建个接口 ，对代码更好的规范
User类（父类）和 Main类（这俩要一起看）
各个包类都创建好了，但是他们如果串联运行呢，要有main才能运行起来，怎么搞，往下看
（上面可能看不太清，可以对着下面看一下，或者对着代码看）
剩下的方法实现起来都蛮简单的，对比着代码看看就能懂，不多说了
完整代码
book包
Book类
package book;public class Book {private String name;private String author;private double price;private String type;private boolean borrowed;//默认falsepublic Book(String name, String author, double price, String type) {this.name = name;this.author = author;this.price = price;this.type = type;}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 double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getType() {return type;}public void setType(String type) {this.type = type;}public boolean isBorrowed() {return borrowed;}public void setBorrowed(boolean borrowed) {this.borrowed = borrowed;//借出true //未被借出false}@Overridepublic String toString() {return "Book{" +"name='" + name + '\'' +", author='" + author + '\'' +", price=" + price +", type='" + type + '\'' +((borrowed == false)" />BookList类
package book;public class BookList {//创建数组存放书private Book[] books = new Book[10];private int book_size;//书的个数//构造方法,初始化成员（图书）（示例化BookList时直接就运行书架里的内容）public BookList() {this.books[0] = new Book("三国演义", "罗贯中", 23.1, "小说");//实例化一个Book对象，有参类型，所以Book类哪里要先创建有参的构造方法this.books[1] = new Book("西游记", "吴承恩", 45.1, "小说");this.books[2] = new Book("红楼梦", "曹雪芹", 33.2, "小说");this.books[3] = new Book("水浒传", "施耐庵", 23.2, "小说");this.book_size = 4;}public Book getBooks(int pos) {return books[pos];}public void setBooks(int pos, Book book) {this.books[pos] = book;//新增图书需要}public int getBook_size() {return book_size;}public void setBook_size(int book_size) {this.book_size = book_size;}}operation包
AddBook类
package operation;import book.Book;import book.BookList;import java.util.Scanner;public class AddBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("新增图书");Scanner scanner = new Scanner(System.in);System.out.println("请输入图书名字：>");String name = scanner.nextLine();System.out.println("请输入图书的作者：>");String author = scanner.nextLine();System.out.println("请输入图书的价格：>");int price = scanner.nextInt();scanner.nextLine();System.out.println("请输入图书的类型：>");String type = scanner.nextLine();Book book = new Book(name, author, price, type);//实例化Book对象,存新增的书int currentSize = bookList.getBook_size();//当前剩下的书的数量for(int i = 0; i < currentSize; i++){Book book1 = bookList.getBooks(i);if(book1.getName().equals(name)){System.out.println("书架已有此书，不必添加");}return;}bookList.setBooks(currentSize, book);bookList.setBook_size(currentSize + 1);System.out.println("添加成功！！！");}}BorrowBook类
package operation;import book.Book;import book.BookList;import java.util.Scanner;public class BorrowBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("借阅图书");System.out.println("请输入所借图书名字");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int currentSize = bookList.getBook_size();for(int i = 0; i < currentSize; i++){Book book = bookList.getBooks(i);if(book.getName().equals(name)){if(book.isBorrowed() == false) {book.setBorrowed(true);System.out.println("存在该书，欢迎借阅");}else {System.out.println("该书不存在，对不起");}return;}}}}DeleteBook类
package operation;import book.Book;import book.BookList;import java.util.Scanner;public class DeleteBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("删除图书");System.out.println("请输入你要删除的图书名字：>");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int currentSize = bookList.getBook_size();if(currentSize == 0){System.out.println("书架为空");}int flag = -1;for(int i = 0; i < currentSize; i++){Book book = bookList.getBooks(i);if(book.getName().equals(name)){flag = i;break;}}if(flag == -1){System.out.println("该书不存在");return;}//虽然这样访问不到最后一本书，但是书的数量减一了，这样就自然没了最后一本书for(int i = flag; i < currentSize - 1; i++) {bookList.setBooks(flag, bookList.getBooks(i + 1));}bookList.setBook_size(currentSize - 1);System.out.println("删除成功");}}FindBook类
package operation;import book.Book;import book.BookList;import java.util.Scanner;public class FindBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("寻找图书");System.out.println("输入图书名字;>");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int currentSize = bookList.getBook_size();int index = -1;for(int i = 0; i < currentSize; i++){Book book = bookList.getBooks(i);if(book.getName().equals(name)) { index = i;}}if(index == -1){System.out.println("该书不存在");return;}Book book = bookList.getBooks(index);System.out.println(book);}}PrintBook类
package operation;import book.Book;import book.BookList;public class PrintBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("显示全部图书");int currentSize = bookList.getBook_size();for(int i = 0; i < currentSize; i++){Book book = bookList.getBooks(i);System.out.println(book);}}}ReturnBook类
package operation;import book.Book;import book.BookList;import java.util.Scanner;public class ReturnBook implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("归还图书");System.out.println("请输入图书名字");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int currentSize = bookList.getBook_size();for (int i = 0; i < currentSize; i++){Book book = bookList.getBooks(i);if(book.getName().equals(name)){book.setBorrowed(false);System.out.println("归还成功");return;}}System.out.println("没这本书");}}Exit类
package operation;import book.BookList;public class Exit implements InOperation{@Overridepublic void work(BookList bookList) {System.out.println("退出系统");int currentSize = bookList.getBook_size();for(int i = 0; i < currentSize; i++){bookList.setBooks(i,null);}bookList.setBook_size(0);System.exit(0);}}InOperation接口
package operation;import book.BookList;public interface InOperation {void work(BookList bookList);//因为这些操作都是在书架上，所以传参位BookList类型}user包
Domestic类
package user;import operation.*;import java.util.Scanner;import book.BookList;public class Domestic extends User{public Domestic(String name) {super(name);this.inOperations = new InOperation[]{new Exit(),new BorrowBook(),new ReturnBook(),new FindBook()//记得都要实例化对象才能用，因为他们都是类};}@Overridepublic int menu() {System.out.println("**********当当当！！！欢迎来到普通用户的菜单~~ *********");System.out.println("1.借阅图书 2.归还图书 ");System.out.println("3.查找图书 ");System.out.println("0.退出系统 ");System.out.println("请输入你想要进行的操作所对应的数字~~");Scanner s = new Scanner(System.in);int input = s.nextInt();return input;}}Administrator类
package user;import operation.*;import java.util.Scanner;public class Administrator extends User{public Administrator(String name) {super(name);this.inOperations = new InOperation[]{new Exit(),new AddBook(),new DeleteBook(),new FindBook(),new PrintBook()};}@Overridepublic int menu() {System.out.println("**********当当当！！！欢迎来到管理员的菜单~~ *********");System.out.println("1.新增图书 2.删除图书 ");System.out.println("3.查找图书 4.显示全部图书 ");System.out.println("0.退出系统 ");System.out.println("请输入你想要进行的操作所对应的数字~~");Scanner s = new Scanner(System.in);int input = s.nextInt();return input;}}User类
package user;import book.BookList;import operation.InOperation;public abstract class User {private String name;public InOperation[] inOperations;//用public哟，以便其他地方使用public User(String name) {this.name = name;}public abstract int menu();public void doOperation(int choice, BookList bookList){inOperations[choice].work(bookList);//找到了对应的操作功能调用相应的work方法}}Main类
import book.BookList;import user.Administrator;import user.Domestic;import user.User;import java.util.Scanner;public class Main {public static User login(){System.out.println("********** ~~欢迎来到图书管理系统~~ **********");System.out.println("请登录/注册");System.out.println("请选择你的身份 1 ---> 管理员 0 ---> 普通用户");Scanner s = new Scanner(System.in);int choice = s.nextInt();System.out.println("请输入你的名字");String name = s.next();if(choice == 1){return new Administrator(name);}else {return new Domestic(name);}}public static void main(String[] args) {BookList bookList = new BookList();//实例化对象User user = login();//这个确定身份（管理员或者普通用户）while(true){int choice = user.menu();//这个确定进行什么操作user.doOperation(choice, bookList);}}}