java图书管理系统

分三个包，分别存放了使用者的信息，书籍信息，以及进行的操作方法 

一、book

先来实现每本书的信息（Book类）

package book;

public class Book {
    private String name;//图书名
    private String author;//作者
    private int price;//价格
    private String type;//类型
    private boolean isLend;//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;
    }

    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 isLend() {
        return isLend;
    }

    public void setLend(boolean lend) {
        isLend = lend;
    }


    @Override
    public String toString() {
        return "book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ", isLend=" + isLend +
                '}';
    }
}

再来创建一个书架，存放书籍和记录书的个数

package book;

public class BookList {
    private Book[] books = new Book[10];
    private int useSize;//书架存放书的个数

    public BookList(){
        books[0]=new Book("三国演义","罗贯中",10,"小说");
        books[1]=new Book("水浒传","施耐庵",10,"小说");
        books[2]=new Book("红楼梦","曹雪芹",10,"小说");
        this.useSize = 3;
    }

    public int getUseSize() {
        return useSize;
    }

    public void setUseSize(int useSize) {
        this.useSize = useSize;
    }

    public Book getBook(int pos){
        return books[pos];
    }//得到某本书

    public boolean isFull(){
        if(this.useSize == books.length){
            return true;
        }
        return false;
    }//判断是否满了

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

二、user 

 之后再来实现使用者User类，存放了使用者的姓名和操作选择

package user;

import book.BookList;
import operation.IOperation;

public abstract  class User {
    protected String name;
    protected IOperation[] operations;

    public User(String name){
        this.name = name;
    }
    public abstract int menu();//抽象类，在子类中实现对应的选择菜单

    public void doIoperation(int choice,BookList bookList){
        this.operations[choice].work(bookList);
    }//对书架进行相应的操作
}

使用者分两类分别是管理员还有普通用户，两者都是使用者，所以需要继承User类

管理员

package user;

import operation.*;

import java.util.Scanner;

public class AdminUser extends User{

    public AdminUser(String name) {
        super(name);
        this.operations = 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("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 choice = scanner.nextInt();
        return choice;
    }
}

 普通用户

package user;

import operation.*;

import java.util.Scanner;

public class NormalUser extends User{
    public NormalUser(String name) {
        super(name);
        this.operations = new IOperation[]{new ExitOperation(),new FindOperation(),new BorrowedOperation(),
        new ReturnOperation()};
    }

    public int menu(){
        System.out.println("**********普通用户菜单*************");
        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 choice = scanner.nextInt();
        return choice;//返回操作选择
    }
}

 三、operation

先来实现接口IOperation

package operation;

import book.BookList;

public interface IOperation {
    void work(BookList bookList);
}

 查找图书

package operation;

import book.BookList;

import java.util.Scanner;

import book.Book;
public class FindOperation implements IOperation {
    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：");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.nextLine();

        int currentSize = bookList.getUseSize();
        for(int i = 0;i<currentSize;i++){
            Book book = bookList.getBook(i);
            if(book.getName().equals(bookName)){
                System.out.println("找到了这本书");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有找到你要找的书..........");
    }
}

新增图书

package operation;

import book.BookList;

import java.util.Scanner;

import book.Book;
public class AddOperation implements IOperation{

    public void work (BookList bookList){
        System.out.println("新增图书......");

        if(bookList.isFull()){
            System.out.println("书架满了 不能新增了");
        }
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要新增的图书的书名：");
        String bookName = scanner.nextLine();

        System.out.println("请输入你要新增的图书的作者：");
        String author = scanner.nextLine();

        System.out.println("请输入你要新增的图书的价格：");
        int price = scanner.nextInt();

        System.out.println("请输入你要新增的图书的类型：");
        String blank = scanner.nextLine();//拿取因输入price的'\n'来进行下一步的输入类型操作
        String type = scanner.nextLine();

        Book book = new Book(bookName,author,price,type);

        int currentSize =bookList.getUseSize();
        bookList.setBook(currentSize,book);
        bookList.setUseSize(currentSize+1);

        System.out.println("新增图书成功");

    }
}

删除图书

package operation;

import book.BookList;

import java.util.Scanner;

import book.Book;
public class DelOperation implements IOperation{
    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的书名:");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.nextLine();

        int currentSize =bookList.getUseSize();
        int pos = -1;
        int i =0;
        for(i=0;i<currentSize;i++){
            Book book = bookList.getBook(i);
            if(book.getName().equals(bookName)){
                //找到记录下标
                pos = i;
                break;
            }
        }
        if(i>=currentSize){
            System.out.println("没有找到你要删除的书");
            return;
        }
        //开始删除
        int j = 0;
        for(j=pos;j<currentSize-1 ; j++){
            Book book = bookList.getBook(j+1);
            bookList.setBook(j,book);
        }
        bookList.setUseSize(currentSize-1);
        bookList.setBook(currentSize-1,null);
        System.out.println("删除成功");
    }

}

显示图书

package operation;

import book.BookList;

import book.Book;
public class ShowOperation implements IOperation{
    public void work(BookList bookList){
        System.out.println("显示图书......");

        int currentSize = bookList.getUseSize();
        for(int i = 0;i<currentSize;i++){
            Book book = bookList.getBook(i);
            System.out.println(book);
        }

    }
}

借阅图书

package operation;

import book.BookList;
import book.Book;

import java.util.Scanner;

public class BorrowedOperation implements IOperation {
    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名：");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.nextLine();

        int currentSize = bookList.getUseSize();
        int i = 0;
        for (i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if (book.getName().equals(bookName)) {
                if (book.isLend()) {
                    System.out.println("图书已经被借出 借阅失败");
                    return;
                }
                book.setLend(true);
                System.out.println("借阅成功");
                return;
            }
        }
        System.out.println("没有找到你要借阅的书");
    }
}

归还图书

package operation;

import book.BookList;
import book.Book;

import java.util.Scanner;

public class ReturnOperation implements IOperation{
    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名：");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.nextLine();

        int currentSize = bookList.getUseSize();
        for(int i=0;i<currentSize;i++){
            Book book = bookList.getBook(i);
            if(book.getName().equals(bookName)){
                book.setLend(false);
                System.out.println("归还成功");
                return;
            }
        }
            System.out.println("归还失败");
    }
}

退出系统

package operation;

import book.BookList;

public class ExitOperation implements IOperation{

    public void work(BookList bookList){
        System.out.println("退出系统..........");

        int currentSize =bookList.getUseSize();
        for(int i=0;i<currentSize;i++){
            bookList.setBook(i,null);
        }//将书架置为空
        System.exit(0);
    }
}

 四、Library

登录

import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;
import java.util.Scanner;

public class Library {

    //AdminUser和NormalUser都继承User，所以返回值是User
    public static User Login(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的姓名：");
        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){
            AdminUser adminUser = new AdminUser(name);
            return adminUser;
        }else{
            NormalUser normalUser = new NormalUser(name);
            return normalUser;
        }
    }

    public static void main(String[] args) {

        BookList bookList = new BookList();//创建书架
        User user = Login();//根据用户选择看是管理员还是普通用户
        while(true) {

            int choice = user.menu();//可能是管理员或普通用户的功能，需要区分组织
            user.doIoperation(choice, bookList);
        }
    }
}