java实现图书系统源码

建包和类:

Book

Book:

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 boolean isBorrowed() {
        return isBorrowed;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    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;
    }

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

BookList:

package Book;

public class BookList {
    private Book[] books = new Book[10];//创建一个数组
    private  int UsedSize;//有效的使用长度//实践上放书的个数



    public BookList(){
        this.books[0]=new Book("三国演义","罗贯中",10,"小说");
        this.books[1]=new Book("红楼梦","曹雪芹",20,"小说");
        this.books[2]=new Book("西游记","吴承恩",30,"小说");

        this.UsedSize = 3;//书架上的书

    }
    //用来访问数组的长度
    public int getUsedSize() {
        return UsedSize;
    }

    public void setUsedSize(int usedSize) {
        UsedSize = usedSize;
    }

    //用来访问数组下标,所以我们要对这个进行修改,使其返回数组的下标
    public Book getBook(int pos) {
        return books[pos];
    }

    //给某一个位置放一本书
    public void setBook(int pos,Book book) {
        this.books[pos] = book;
    }

    //得到书的数组的长度

    public Book[] getBooks() {
        return books;
    }
}

Main:

package Book;

import User.User;
import User.AdminUser;
import User.NomalUser;
import java.util.Scanner;

public class Main {
        public static User login(){
                Scanner scanner =new Scanner(System.in);
                System.out.println("请输入你的名字: ");
                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();// 1 或者 2

                if(choice == 1){
                        return new AdminUser(name);

                }else{
                        return new NomalUser(name);
                }

        }

        public static void main(String[] args) {
                BookList bookList =  new BookList();

                User user =login();
                while(true){
                        //看user引用哪个对象,然后下一步调用哪个菜单
                        int choice = user.menu();

                        //根据返回值 调那个对象 使用哪个方法
                        //确认对象 包含了 哪些方法?
                        //在进行调用子类的对象是,构造方法会初始化好对应的操作对象
                        //user引用了哪个对象
                        user.doIoperation(choice,bookList);
                }

        }

}

User

User:

package User;

import Book.BookList;
import ioperations.IOperation;



public abstract class User {
    protected String name;
    //此时这个数组没有初始化
    protected IOperation[] iOperations;

    public User(String name){
        this.name = name;
    }
    public abstract int menu();

    //构造一个方法去实现调用
    //通过数组下标使用数组进行调用,选择的方法
    public void doIoperation(int choice , BookList bookList){
        iOperations[choice].work(bookList);
        //通过点号访问方法
    }

}

AdminUser:

package User;

import ioperations.*;

import java.util.Scanner;

public class AdminUser extends User {
    public AdminUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new ShowOperation(),

        };
    }

    public int menu(){
        System.out.println("**欢迎"+this.name+"进入图书系统**");
        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("********************");
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入你选择的数字: ");
        int choice = scanner.nextInt();
        return choice;

    }
}

NomalUser:

package User;

import ioperations.*;

import java.util.Scanner;

public class NomalUser extends User{
    public NomalUser(String name) {
        super(name);
        //创建新的数组,new 新的方法
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation()
        };
    }

    public int menu(){
        System.out.println("****欢迎"+this.name+"进入图书系统****");
        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("************************");
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入你选择的数字: ");
        int choice = scanner.nextInt();
        return choice;

    }
}

ioperations

ioperation:

package ioperations;

import Book.BookList;

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

}

AddOperation:

package ioperations;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

public class AddOperation implements IOperation {
    //新增图书
    public void work(BookList bookList) {
        System.out.println("新增图书.....");

        //1.判断是否已经满了
        //2.输入各种成员变量 构建对象
        // 3.放到数组的最后一个位置
        //4.us++


        //1.判满
        int currentSize = bookList.getUsedSize();

        if (currentSize == bookList.getBooks().length) {
            System.out.println("书架满了,不能放了");
            return;
        }


        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入书名:");
        String name = scanner.nextLine();

        System.out.println("请输入作者:");
        String author = scanner.nextLine();

        System.out.println("请输入书的类型:");
        String type = scanner.nextLine();

        System.out.println("请输入价格:");
        int price = scanner.nextInt();

        Book newbook = new Book(name, author, price, type);

        //3.判断有没有这本书不能插入
        for (int i = 0; i < currentSize; i++) {

            //第一步:从书架上拿到书
            Book book = bookList.getBook(i);
            //通过书得到书的名字,然后用equals于输入的名字进行对比
            if (book.getName().equals(name)) {
                System.out.println("有这本书不能插入");
                System.out.println(book);
                return;
            }
            //4.插入
            bookList.setBook(currentSize, newbook);

            bookList.setUsedSize(currentSize + 1);

            System.out.println("新增图书成功!!");
        }
    }
}

BorrowOperation:

package ioperations;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

public class BorrowOperation implements IOperation {
    //借阅图书
    public void work(BookList bookList) {
        System.out.println("借阅图书.....");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要借阅的书名:");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            //第一步:从书架上拿到书
            Book book = bookList.getBook(i);

            //通过书得到书的名字,然后用equals于输入的名字进行对比
            if (book.getName().equals(name)) {
                if(book.isBorrowed()) {
                    System.out.println("该书已经被借出!!");
                    return;
                }

                System.out.println("找到了这本书");
                System.out.println(book);
                book.setBorrowed(true);
                System.out.println("借阅成功!!");
                return;
            }
        }
        System.out.println("没有你要找的书");
    }
}

DelOperation:

package ioperations;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

    public class DelOperation implements IOperation{
    //删除图书
    public void work(BookList bookList) {
        System.out.println("删除图书.....");

        //找到自己要删除书的位置,然后后面往前面覆盖 us--;

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的书名:");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        //记录下标 pos
        int pos = -1;
        int i = 0;
        for (i = 0; i < currentSize; i++) {
            //第一步:从书架上拿到书
            Book book = bookList.getBook(i);
            //通过书得到书的名字,然后用equals于输入的名字进行对比
            if (book.getName().equals(name)) {
                System.out.println("找到了这本书");
                System.out.println(book);
                pos = i;
                break;
            }
        }
        if (i == currentSize) {
            System.out.println("没有你要删除的书");
            return;
        }

        //开始删除...
        for (int j = pos; j <currentSize-1 ; j++) {
            //bookList[j] = bookList[j+1];
            Book book = bookList.getBook(j+1);

            bookList.setBook(j,book);
        }
        bookList.setBook(currentSize-1,null);

        bookList.setUsedSize(currentSize-1);
        System.out.println("删除成功!!!");


    }
}

ExitOperation:

package ioperations;

import Book.BookList;

public class ExitOperation implements IOperation{
    //退出系统
    public void work(BookList bookList){
        System.out.println("退出系统.....");
        //调用exit 设置为0 正常退出
        System.exit(0);
    }
}

FindOperation:

package ioperations;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

public class FindOperation implements IOperation {
    //查找图书
    public void work(BookList bookList) {
        System.out.println("查找图书.....");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要查找的书名:");
        String name = scanner.nextLine();

        //获得书架的长度存到currentSize中
        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {

            //第一步:从书架上拿到书
            Book book = bookList.getBook(i);
            //通过书得到书的名字,然后用equals于输入的名字进行对比
            if (book.getName().equals(name)) {
                System.out.println("找到了这本书");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有你要找的书");
    }
}

ReturnOperation:

package ioperations;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

public class ReturnOperation implements IOperation{
    //归还图书
    public void work(BookList bookList){
        System.out.println("归还图书.....");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要归还的书名:");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            //第一步:从书架上拿到书
            Book book = bookList.getBook(i);

            //通过书得到书的名字,然后用equals于输入的名字进行对比
            if (book.getName().equals(name)) {
                if(book.isBorrowed()) {
                    book.setBorrowed(false);
                    System.out.println("归还成功!!");
                    return;
                }

            }
        }
        System.out.println("没有你要归还的图书!!");
    }
}

ShowOperation:

package ioperations;

import Book.Book;
import Book.BookList;

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

        //currentSize 用来获取书架长度
        int currentSize = bookList.getUsedSize();

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

        }

    }
}