JAVASE-图书管理系统

已于 2025-04-13 23:01:56 修改
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分类专栏： JAVASE 文章标签： 开发语言 java
于 2024-08-15 23:56:51 首次发布
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本文链接：https://blog.youkuaiyun.com/2301_79696203/article/details/141233759
版权

一.所有文件一览

二.代码实现

1.book

1.1 Book.java
1.1.1快捷键

package book;

public class Book {
    //全部使用private进行封装
    private String name;
    private String author;
    private int price;
    private String type;
    private boolean isBorrowed; //默认是false，不用设置构造方法

    //创建构造方法
    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
        //isBorrowed默认是false，不用设置构造方法
    }

    //使用get，set方法读写成员变量
    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 void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    public boolean isBorrowed() {
        return isBorrowed;
    }

    //重写toString，输出
    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +"," +
                ((isBorrowed == true) ? "已借出" : "未借出") +
                //", isBorrowed=" + isBorrowed +
                '}';
    }
}
1.1.2代码
1.2 BookList.java
package book;

public class BookList {
    private Book[] books = new Book[10]; //书架容量
    private int usedSize; //有效的数据个数（实际放书的个数）

    public BookList() {
        books[0] = new Book("三国演义","罗贯中", 10, "小说");
        books[1] = new Book("西游记","吴承恩", 17, "小说");
        books[2] = new Book("红楼梦","罗贯中", 13, "小说");

        this.usedSize = 3;
    }

    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }

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

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

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

2.ioperations

2.1AddOperation.java
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：");

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

        //输入
        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);

        //判断是否重复
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBooks(i);
            if (book.getName().equals(name)) {
                System.out.println("有这本书！不能插入！");
                System.out.println(book);
                return;
            }
        }

        //插入这本书
        bookList.setBooks(currentSize,newbook);
        bookList.setUsedSize(currentSize+1);
        System.out.println("新增图书成功");

    }

}
2.2BorrowOperation.java
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("请输入书名");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBooks(i);

            if (book.isBorrowed()) {
                System.out.println("这本书已经被借出了");
                return;
            }

            if (book.getName().equals(name)) {
                book.setBorrowed(true);
                System.out.println("借阅成功");
                return;
            }
        }
    }
}
2.3DelOperation.java
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("请输入你要删除的书名");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        int pos = -1;
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBooks(i);
            if (book.getName().equals(name)) {
                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++) {  //如果是j < currentSize有可能会越界
            Book book = bookList.getBooks(j+1);
            bookList.setBooks(j,book);
        }
        bookList.setBooks(currentSize-1, null);

        bookList.setUsedSize(currentSize - 1);
        System.out.println("删除成功！");
    }
}
2.4ExitOperation.java
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);
    }
}
2.5FindOperation.java
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("请输入你的书名：");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBooks(i);
            if (book.getName().equals(name)) {
                System.out.println("找到了这本书！");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有你要找的这本书");
    }
}
2.6IOPeration.java
package ioperations;

import book.BookList;

public interface IOPeration {
    public void work(BookList bookList);
}
2.7ReturnOperation.java
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("请输入书名");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBooks(i);

            if (book.getName().equals(name)) {
                if (book.isBorrowed()) {
                    book.setBorrowed(false);
                    System.out.println("归还成功！");
                    return;
                }
            }
        }

        System.out.println("没有你要归还的书...");
    }
}
2.8ShowOperation.java
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.getBooks(i);
            System.out.println(book);
        }
    }
}

3.user

3.1AdminUser.java
import ioperations.*;

import java.util.Scanner;

public class AdminUser extends User {

    public AdminUser(String name) {
        super(name);
        this.ioPerations = new IOPeration[]{
                new ExitOperation(), //0下标
                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("请输入你的操作：");
        int choice = scanner.nextInt();
        return choice;
    }

}
3.2NormalUser.java
package user;

import ioperations.*;

import java.util.Scanner;

public class NormalUser extends User {
    public NormalUser(String name) {
        super(name);
        this.ioPerations = new IOPeration[]{
                new ExitOperation(), //0下标
                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("请输入你的操作：");
        int choice = scanner.nextInt();
        return choice;
    }
}
3.3User.java
package user;

import book.BookList;
import ioperations.IOPeration;

public abstract class User { //写成抽象类，专门用于继承
    protected String name;

    //数组没有初始化
    protected IOPeration[] ioPerations;

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

    public abstract int menu();

    public void doIoperation(int choice, BookList bookList) {
        ioPerations[choice].work(bookList);
    }

}

4.Main.java

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

import java.util.Scanner;

public class Main {
    public static User login() { //使用向上转型
        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) {
            return new AdminUser(name);
        }else {
            return new NormalUser(name);
        }
    }

// 面向对象就是对象与对象之间协作完成某件事情
    public static void main(String[] args) {
        BookList bookList = new BookList();
        User user = login();
        while(true) {
            int choice = user.menu();
            user.doIoperation(choice, bookList);
        }
    }
}

三.运行结果

1.管理员

2.普通用户

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