目录

图书管理系统演示

包的分类

包的内部成员

book包

user包

operation包

具体实现

main函数

User

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AdminUser

NormalUser

Book

BookList

FindOperation

AddOperation 

DelOperation

DisplayOperation

ExitOperation

BorrowOperation

ReturnOperation

图书管理系统演示

以管理员身份进入图书管理系统

 显示图书

查找图书 

增加图书 

 

 再次显示图书

 删除图书

再次显示图书

退出系统

以普通成员身份进入图书管理系统

借阅图书

查找图书

归还图书

 

再次查找图书

包的分类

我们要实现图书管理系统首先必不可少的是要确定有哪几个对象，每个对象都放入一个包当中。

图书管理系统的对象有：图书，使用者。所以我们这里就可以分俩个包。为了方便理解，我们也可以把使用者的一些操作单独放入一个包当中

包的内部成员

包分配好了之后，我们就可以在包中写每个包中的具体成员了。

比如book包，我们可以有图书类和用于存放图书的书架类

user包，我们可以有管理员类，普通成员类

operation包中就可以有一些操作：查找图书，增加图书，删除图书，显示图书，借阅图书，归还图书，退出图书管理系统。

book包

user包

因为不管是管理员还是普通成员，都是使用者，这里我们可以写一个User类，让管理员和普通成员继承它，方便以后的一些操作。

operation包

 因为这些方法都是对书架上的图书进行一些操作，所以我们可以写一个接口来作为一种规范。让其它方法都继承它。

具体实现

main函数

import book.BookList;
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 username = scanner.nextLine();
        System.out.println("请输入你的身份：1 - 管理员，0 - 普通用户");
        int choice = scanner.nextInt();
        if(choice == 1){
            return new AdminUser(username);
        }else{
            return new NormalUser(username);
        }
    }
    public static void main(String[] args) {
        //准备数据
        BookList bookList = new BookList();
        //登录
        User user = login();
        while(true) {
            int choice = user.menu();
            user.doOperation(choice, bookList);
        }
    }
}

User

package user;

import book.BookList;
import operation.IOperation;

public abstract class User {
    protected String name;
    protected IOperation[] ioperation;//只是定义了一个数组，没有初始化和分配内存
    public User(String name){
        this.name = name;
    }
    public abstract int menu();
    public void doOperation(int choice, BookList bookList){
        ioperation[choice].work(bookList);
    }
}

AdminUser

package user;

import operation.*;

import java.util.Scanner;

public class AdminUser extends User {
    public AdminUser(String name){
        super(name);
        this.ioperation = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DispalyOperation(),
        };
    }
    public int menu(){
        System.out.println("***********************************");
        System.out.println("hello"+name+"欢迎来到图书小练习");
        System.out.println("0.退出系统");
        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("***********************************");
        System.out.println("请输入你的操作：");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

NormalUser

package user;

import operation.*;

import java.util.Scanner;

public class NormalUser extends User {
    public NormalUser(String name){
        super(name);
        this.ioperation = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation(),
        };
    }
    public int menu(){
        System.out.println("***********************************");
        System.out.println("hello"+name+"欢迎来到图书小练习");
        System.out.println("0.退出系统");
        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("***********************************");
        System.out.println("请输入你的操作：");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

Book

package book;

public class Book {
    private String name;//书名
    private String author;//作者
    private int price;//价格
    private String type;//种类
    private boolean isBorrowed;//是否被借出

    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ((isBorrowed == true)?"已借出":"未借出")+
                '}';
    }

    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;
    }
}

BookList

package book;

public class BookList {
    Book[] books = new Book[10];
    private int usedsize = 10;
    //预先存放几本书
    public BookList(){
        books[0] = new Book("三国演义","罗贯中",50,"小说");
        books[1] = new Book("西游记","吴承恩",40,"小说");
        books[2] = new Book("红楼梦","曹雪芹",50,"小说");
        usedsize = 3;
    }

    public int getUsedsize() {
        return usedsize;
    }

    public void setUsedsize(int usedsize) {
        this.usedsize = usedsize;
    }
    public Book getPos(int pos){
        return books[pos];
    }
    //存储一本书到指定的位置
    //当前最后可以存储的位置
    public void setBooks(Book book,int pos){
        books[pos] = book;
    }
}

FindOperation

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class FindOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("查找图书");
        System.out.println("请输入你要查找的图书名字");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedsize();
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())){
                System.out.println("找到了");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有这本书");
    }
}

AddOperation 

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class AddOperation implements IOperation {
    @Override
    public void work(BookList bookList) {
        System.out.println("增加图书");
        System.out.println("请输入书的名字");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入书的作者");
        String author = scanner.nextLine();
        System.out.println("请输入书的价格");
        int price = scanner.nextInt();
        scanner.nextLine();//读enter建
        System.out.println("请输入书的类型");
        String type = scanner.nextLine();
        Book book = new Book(name,author,price,type);
        int currentSize = bookList.getUsedsize();
        bookList.setBooks(book,currentSize);
        currentSize++;
        bookList.setUsedsize(currentSize);
    }
}

DelOperation

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书");
        System.out.println("请输入你要删除的图书：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int n = -1;
        int currentSize = bookList.getUsedsize();
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())){
                n = i;
                break;
            }
        }
        if(n == -1){
            System.out.println("没有你要删除的这本书");
            return;
        }
        for (int i = n; i < currentSize-1; i++) {
            Book book = bookList.getPos(i+1);
            bookList.setBooks(book,i);
        }
        //每次删除都要把最后一本书置空
        bookList.setBooks(null,currentSize-1);
        bookList.setUsedsize(currentSize-1);
        System.out.println("删除成功");
    }
}

DisplayOperation

package operation;

import book.Book;
import book.BookList;

public class DispalyOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("显示图书");
        int currentSize = bookList.getUsedsize();
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getPos(i);
            System.out.println(book);
        }
    }
}

ExitOperation

package operation;

import book.BookList;

public class ExitOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("退出系统");
        System.exit(0);
    }
}

BorrowOperation

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class BorrowOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("借阅图书");
        System.out.println("请输入你要借阅的图书");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedsize();
        for (int i = 0; i <currentSize ; i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())){
                if(book.isBorrowed() == true){
                    System.out.println("该书已经被借出");
                    return;
                }else{
                    book.setBorrowed(true);
                    System.out.println("借书成功");
                    return;
                }
            }
        }
        System.out.println("没有你要借的图书");
    }
}

ReturnOperation

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class ReturnOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("归还图书");
        System.out.println("请输入你要归还的图书");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedsize();
        for (int i = 0; i <currentSize ; i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())){
                if(book.isBorrowed() == true){
                    book.setBorrowed(true);
                    System.out.println("还书成功");
                    return;
                }else{
                    System.out.println("该书已被归还");
                    return;
                }
            }
        }
        System.out.println("该书不是本图书馆的书，无需归还");
    }
 }