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图书管理系统

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book包

Book类

package book;

public class Book {
    private String name;
    private String author;
    private int price;
    private  String type;
    private boolean isBorrowed;

    public Book(String name, String author, int 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 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;
    }

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

Booklist 类

package book;

public class Booklist {
    private Book[] books = new Book[10];
    public int usedSize;
    public Booklist(){
         this.books[0] = new Book("三国演义","罗贯中",10,"小说");
         this.books[1] = new Book("西游记","吴承恩",13,"小说");
         this.books[2] = new Book("红楼梦","曹雪芹",11,"小说");
         this.usedSize = 3;
    }



    public Book getBook(int pos) {
        return books[pos];
    }
    public void setBook(int pos,Book book) {
        this.books[pos] = book;
    }

    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }
    public Book[] getBooks(){
        return books;

    }

}

ioperations包

IOPeration接口

package ioperations;

import book.Booklist;

public interface IOPeration {

    void work(Booklist booklist);
}

AddOperation类

package ioperations;

import book.Book;
import book.Booklist;

import java.util.Scanner;

public class AddOperation implements IOPeration{
    public void work(Booklist booklist){
        System.out.println("新增图书");
        //判断书架是否已经满了
        int currentSize = booklist.getUsedSize();
        if(  currentSize == booklist.getBooks().length){
            System.out.println("书架满了，不能放了.....");
            return;
        }
        //构建图书
        Scanner scanner = new Scanner(System.in);

        System.out.println("输入你的书名: ");
        String name = scanner.nextLine();

        System.out.println("请输入你的作者: ");
        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();

        Book newBook = new Book(name,author,price,type);
       //判断是否已经存在
        for (int i = 0; i < currentSize ; i++) {
            Book book = booklist.getBook(i);
            if(book.getName().equals(name)){
                System.out.println("这本书已有不能插入");
                return;
            }
        }
        //新增图书
        booklist.setBook(currentSize,newBook);
        booklist.setUsedSize(currentSize+1);
        System.out.println("新增图书成功！！！");
    }
}

BorrowOperation类 

package ioperations;

import book.Book;
import book.Booklist;

import java.util.Scanner;

public class BorrowOperation implements IOPeration{
    public void work(Booklist booklist){
        System.out.println("借阅图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入你要借阅的书");
        String name = scanner.nextLine();

        int currentSize = booklist.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            Book book = booklist.getBook(i);

            if(book.getName().equals(name)){
                book.setBorrowed(true);
                System.out.println("借阅成功");
                return;
            }
        }
        System.out.println("没有你要找的书");
    }
}

 ExitOperation

package ioperations;

import book.Booklist;

public class ExitOperation implements  IOPeration{
    public void work(Booklist booklist){

        System.out.println("退出系统");
        System.exit(0);
    }
}

 DelOperation类

package ioperations;
import book.Book;
import book.Booklist;

import java.util.Scanner;

public class FindOperation implements IOPeration{
    public void work(Booklist booklist){

        System.out.println("查找图书.....");
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入你的书名");
        String name = scanner.nextLine();
        int currentSize = booklist.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            Book book = booklist.getBook(i);
            if(book.getName().equals(name)){
                System.out.println("找到了这本书");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有找到这本书");
    }
}

 FindOperation 类 

package ioperations;

import book.Book;
import book.Booklist;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    public void work(Booklist booklist) {
        System.out.println("删除图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入你要删除的书");
        String name = scanner.nextLine();

        int currentSize = booklist.getUsedSize();
        int pos = -1;
        //找到这本书
        int i = 0;
        for ( ; i < currentSize; i++) {
            Book book = booklist.getBook(i);
            if(book.getName().equals(name)){
                pos = i;
               break;
            }
        }
        if(i == currentSize) {
            System.out.println("没有你要删除的图书！");
            return;
        }
        //删除
        for (int j = pos; j < currentSize -1; j++) {
            Book book = booklist.getBook(j+1);
            booklist.setBook(j,book);
        }
        booklist.setBook(currentSize-1,null);
        booklist.setUsedSize(currentSize-1);

    }
}

 ReturnOperation类

package ioperations;

import book.Book;
import book.Booklist;

import java.util.Scanner;

public class ReturnOperation implements IOPeration{
    public void work(Booklist booklist){
        System.out.println("归还图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入你要归还的书");
        String name = scanner.nextLine();

        int currentSize = booklist.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            Book book = booklist.getBook(i);
            if(book.getName().equals(name)){
                book.setBorrowed(false);
                System.out.println("归还成功");
                return;
            }
        }
        System.out.println("没有你要归还的图书");
    }
}

 ShowOperation 类 

package ioperations;

import book.Book;
import book.Booklist;

public class ShowOperation implements IOPeration{
    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.getBook(i);
              System.out.println(book);
        }
    }
}

  user包

 User类

package user;

import book.Booklist;
import ioperations.IOPeration;

public abstract class User {
    protected String name;
    protected IOPeration[] ioperation;
    public User(String name){
        this.name = name;
    }

        public abstract int menu ();
        public void doIoperation ( int choice, Booklist booklist){
        this.ioperation[choice].work(booklist);
      }
    }

AdminUser类

package user;

import ioperations.*;

import java.util.Scanner;

import static 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 ShowOperation(),
        };
    }

    public int menu() {
        System.out.println("************管理员菜单****************");
        System.out.println("欢迎来"+this.name+"到图书管理系统");
        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("0.退出图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的操作");
        int choice = scanner.nextInt();
        return choice;

    }
}

NormalUser类 

package user;

import ioperations.*;

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("************管理员菜单****************");
        System.out.println("欢迎来"+this.name+"到图书管理系统");
        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("0.退出图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的操作");
        int choice = scanner.nextInt();
        return choice;
    }
}

  Main类

import book.Booklist;
import user.AdminUser;
import user.NormalUser;
import user.User;

import java.util.Scanner;

public class Main {
    public static User Login(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你姓名：");
        String name = scanner.nextLine();
        System.out.println("请输入你的身份，1：管理员 2：普通用户");
        int choice = scanner.nextInt();
        if(choice == 1){
            return new AdminUser(name);
        }if(choice == 2){
            return new NormalUser(name);
        }else{
            return null;
        }
    }
    public static void main(String[] args) {
        Booklist booklist = new Booklist();
           User user = Login();
           while(true) user.doIoperation(user.menu(), booklist);
    }
}

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