概述

簡易的圖書管理系統中所包含的知識點主要為面向物件中的封裝，繼承，多型，介面，抽象類，包，順序表的增刪查改等技術，能夠實作管理員的普通用戶的對圖書管理的部分功能，詳細如下

創建的包和類

在這里插入圖片描述

主函式Main

Main.java

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

import java.util.Scanner;
/**
 * ClassName: Main
 * Description:
 * date: 2021/4/23 21:16
 * @author wt
 * @since JDK 1.8
 */
public class Main {

    public static User login() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("請輸入姓名:");
        String name = scanner.nextLine();
        System.out.println("請選擇你的身份  1.管理員 2.普通用戶 ");
        int choice = scanner.nextInt();
        if (choice == 1) {
            return new AdminUser(name);
        } else {
            return new NormalUser(name);
        }
    }

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

        User user = login();

        while (true) {

            int choice = user.menu();
            user.doOpeartion(choice,bookList);
        }

    }
}

book層

Book.java

package book;

/**
 * ClassName: Book
 * Description:書的屬性
 * date: 2021/4/23 15:02
 * @author wt
 * @since JDK 1.8
 */
public class Book {

    private String name;//書名
    private String author;//作者
    private int price; //價格
    private String type; //型別
    private boolean flg; //是否借出

    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 isFlg() {
        return flg;
    }

    public void setFlg(boolean flg) {
        this.flg = flg;
    }

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

BookList.java

package book;
/**
 * ClassName: BookList
 * Description:
 * date: 2021/4/23 15:03
 *  書架
 * @author wt
 * @since JDK 1.8
 */
public class BookList {
    private Book[] books = new Book[10];
    private int usedSize;

    public BookList() {
        books[0] = new Book("三國演義","羅貫中",56,"小說");
        books[1] = new Book("西游記","吳承恩",77,"小說");
        books[2] = new Book("水滸傳","施耐庵",66,"小說");
        this.usedSize = 3;
    }

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

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

    public int getUsedSize() {
        return usedSize;
    }

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

operation層

IOpeartion .java定義的一個介面類

package operation;

import book.BookList;

/**
 * ClassName: IOpeartion
 * Description:
 * date: 2021/4/23 20:25
 * 介面
 * @author wt
 * @since JDK 1.8
 */
public interface IOpeartion {
     void work(BookList bookList);

}

下面所以的對圖書的操作類都繼承這個介面，

Add.java

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * ClassName: Add
 * Description:添加圖書
 * date: 2021/4/23 20:29
 *  新增圖書
 * @author wt
 * @since JDK 1.8
 */
public class Add implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("新增圖書");

        System.out.println("請輸入書名：");
        String name = scanner.nextLine();

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

        System.out.println("請輸入型別：");
        String type = scanner.nextLine();

        System.out.println("請輸入價格：");
        int price = scanner.nextInt();



        int curSize = bookList.getUsedSize();

        Book book = new Book(name,author,price,type);
        int pos = bookList.getUsedSize();
        bookList.setBooks(pos,book);

        bookList.setUsedSize(curSize+1);
        System.out.println("新增成功！");
    }
}

Borrow.java

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * ClassName: Borrow
 * Description:
 * date: 2021/4/23 20:31
 *  借閱圖書
 * @author wt
 * @since JDK 1.8
 */
public class Borrow implements IOpeartion{
    @Override
    public void work(BookList bookList) {
        System.out.println("借閱圖書");
        System.out.println("請輸入書名:");
        Scanner scanner = new Scanner(System.in);
        String bookname = scanner.nextLine();
        System.out.println();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            //將i下標的這本書放到book里
            Book book = bookList.getBooks(i);
            //取出這個書的書名與要輸入的書名bookname比較
            if (book.getName().equals(bookname)) {
                book.setFlg(true);
                System.out.println("借閱成功！");
                return;
            }
        }
        //
        System.out.println("沒有這本書！！！");
    }
}

Del.java

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * ClassName: Del
 * Description:
 * date: 2021/4/23 20:32
 *  洗掉圖書
 * @author wt
 * @since JDK 1.8
 */
public class Del implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        System.out.println("洗掉圖書");
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入書名：");
        String name = scanner.nextLine();

        int pos = -1;

        for (int i = 0; i <bookList.getUsedSize() ; i++) {
            Book book = bookList.getBooks(i);
            if (book.getName().equals(name)) {
                pos = i;
                break;
            }
        }

        if (pos == -1) {
            System.out.println("沒有這本書！");
            return;
        }
        //有效個數用curSize表示
        int curSize = bookList.getUsedSize();
        for (int i = pos; i < curSize-1; i++) {
            //順序表洗掉操作
            //[i] = [i+1]
            Book book = bookList.getBooks(i+1);
            bookList.setBooks(i,book);
        }
        bookList.setUsedSize(curSize-1);
        //curSize的一直沒有變化，curSize-1始終表示最后一個有效個數的位置的下標
        //置為空，因為books為陣列，存放的為參考型別，需要釋放記憶體
        bookList.setBooks(curSize-1,null);
    }
}

Display.java

package operation;

import book.BookList;

/**
 * ClassName: Display
 * Description:顯示圖書
 * date: 2021/4/23 20:33
 *  顯示圖書
 * @author wt
 * @since JDK 1.8
 */
public class Display implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        System.out.println("顯示圖書");
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            System.out.println(bookList.getBooks(i));
        }
    }
}

Exit.java

package operation;

import book.BookList;

/**
 * ClassName: Exit
 * Description:
 * date: 2021/4/23 20:34
 *  退出系統
 * @author wt
 * @since JDK 1.8
 */
public class Exit implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        System.out.println("退出系統");
        System.exit(0);
    }
}

Find.java

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * ClassName: Find
 * Description:查找圖書
 * date: 2021/4/23 20:35
 *
 * @author wt
 * @since JDK 1.8
 */
public class Find implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        System.out.println("查找圖書");
        System.out.println("請輸入書名:");
        Scanner scanner = new Scanner(System.in);
        String bookname = scanner.nextLine();
        System.out.println();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            //將i下標的這本書放到book里
            Book book = bookList.getBooks(i);
            //取出這個書的書名與要輸入的書名bookname比較
            if (book.getName().equals(bookname)) {
                System.out.println("找到這本書：");
                System.out.println(book);
                return;
            }
        }
        //
        System.out.println("沒有這本書！！！");
    }
}

Return.java

package operation;

import book.BookList;

import java.util.Scanner;

/**
 * ClassName: Return
 * Description:
 * date: 2021/4/23 20:36
 *  歸還圖書
 * @author wt
 * @since JDK 1.8
 */
public class Return implements IOpeartion {
    @Override
    public void work(BookList bookList) {
        System.out.println("歸還圖書");
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入要歸還的書名：");
        String name = scanner.nextLine();
        for (int i = 0; i <bookList.getUsedSize() ; i++) {
            if (bookList.getBooks(i).getName().equals(name)) {
                bookList.getBooks(i).setFlg(false);
                System.out.println("歸還成功！");
                return;
            }
        }
        System.out.println("沒有這本書！！！");
    }
}

user層

User.java

package user;

import book.BookList;
import operation.IOpeartion;

/**
 * ClassName: User
 * Description:
 * date: 2021/4/23 19:22
 * @author wt
 * @since JDK 1.8
 */
public abstract class User {

    public String name;

    //1.準備一個介面陣列 存盤每一個物件
    public IOpeartion[] IOpeartions;

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

    //3.
    public void doOpeartion(int choice, BookList bookList) {
        this.IOpeartions[choice].work(bookList);
    }
}

Admin.java

package user;

import operation.*;

import java.util.Scanner;

/**
 * ClassName: AdminUser
 * Description:
 * date: 2021/4/23 20:40
 *  管理員
 * @author wt
 * @since JDK 1.8
 */
public class AdminUser extends User{
    public AdminUser(String name) {
        super(name);
        this.IOpeartions = new IOpeartion[] {
                new Exit(),
                new Find(),
                new Add(),
                new Del(),
                new Display(),
        };
    }

    @Override
    public int menu() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("=======" + "Hello " +this.name + "=======");
        System.out.println("1.查找圖書");
        System.out.println("2.新增圖書");
        System.out.println("3.洗掉圖書");
        System.out.println("4.顯示圖書");
        System.out.println("0.退出系統");
        System.out.println("========================================");

        int choice = scanner.nextInt();
        return choice;
    }
}

NormalUser.java

package user;

import operation.*;

import java.util.Scanner;

/**
 * ClassName: NormalUser
 * Description:
 * date: 2021/4/23 20:41
 *  普通用戶
 * @author wt
 * @since JDK 1.8
 */
public class NormalUser extends User{

    public NormalUser(String name) {
        super(name);
        this.IOpeartions = new IOpeartion[] {
                new Exit(),
                new Find(),
                new Borrow(),
                new Return()
        };
    }

    @Override
    public int menu() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("=======" + "Hello "+this.name + "=======");
        System.out.println("1.查找圖書");
        System.out.println("2.借閱圖書");
        System.out.println("3.歸還圖書");
        System.out.println("0.退出系統");
        System.out.println("========================================");

        int choice = scanner.nextInt();
        return choice;
    }
}

運行結果

1.管理員身份登錄
在這里插入圖片描述
2.普通用戶身份登錄

如有需要原始碼檔案
鏈接: Github原始碼地址.

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標籤：java

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面向物件總結性專案-簡易的圖書管理系統