java编写图书管理系统

基本思路

**此系统的对象有 1:书籍 2：使用者（用户和图书管理员）

1. 图书：它的属性有书名，编号，作者，类别，价格，状态（是否被借出)
2. 使用者
2.1 管理员：姓名，增加书籍，删除书籍，查找书籍，打印书籍信息，退出系统一些简单的操作。
2.2 用户：姓名，查找书籍，借阅书籍，归还书籍，退出系统操作。

创建一个BookManage类

package Demo;public class BookManage {private String name;private String id;private String auther;private String type;private int price;private boolean isBorrow;public BookManage(String name,String id,String auther,String type,int price,boolean isBorrow){this.name = name;this.id = id;this.auther = auther;this.type = type;this.price = price;this.isBorrow = isBorrow;}public String getId(){return id;}public Boolean isBorrow(){return isBorrow;}public void setBorrow(boolean borrow){isBorrow = borrow;}public String getName(){return name;}//重写
@Overridepublic String toString() {return "BookManage{" +"name='" + name + '\'' +", id='" + id + '\'' +", auther='" + auther + '\'' +", type='" + type + '\'' +", price=" + price +", isBorrow=" + isBorrow +'}';}

创建一个类保存书籍

package Demo;import java.awt.print.Book;public class BookList {private  BookManage[] books = new BookManage[100];private int size;public BookList(){books[0] = new BookManage("数据库","001","王珊","数学课本",49,false);books[1] = new BookManage("信号与系统分析","002","吴大正","数学课本",32,false);books[2] = new BookManage("计算机组成原理","003","蒋本珊","数学课本",45,false);size = 3;}public int getSize(){return size;}public void setSize(int size){this.size = size;}public BookManage getBook(int index){return books[index];}public void setBooks(int index, BookManage book) {books[index] = book;}
}

我们将所有的操作方法放到operation包里，所有方法用接口来实现。

package operation;import Demo.BookList;public interface IOperation {void work(BookList bookList);
}

1.增加书籍

import Demo.BookManage;import java.util.Scanner;public class AddBookoperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("新增一本书籍！");System.out.println("请输入新增书籍的书名：");Scanner scanner = new Scanner(System.in);String name = scanner.next();System.out.println("请输入新增书籍的id:");String id = scanner.next();System.out.println("请输入新增书籍的作者:");String author = scanner.next();System.out.println("请输入新增书籍的类型:");String type = scanner.next();System.out.println("请输入新增书籍的价格:");int price = scanner.nextInt();BookManage book = new BookManage(name,id,author,type,price,false);bookList.setBooks(bookList.getSize(), book);bookList.setSize(bookList.getSize()+1);}
}

2.删除书籍

package operation;import Demo.BookList;
import Demo.BookManage;import java.util.Scanner;public class DeleteOperation implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("删除书籍!");System.out.println("请输入您想要删除的书籍的id：");Scanner scanner = new Scanner(System.in);String id = scanner.next();int i = 0;for (; i < bookList.getSize(); i++) {BookManage book = bookList.getBook(i);if(book.getId().equals(id)) {break;}}if(i >= bookList.getSize()) {System.out.println("未找到要找的书籍！");return;}BookManage lastBook = bookList.getBook(bookList.getSize()-1);bookList.setBooks(i, lastBook);bookList.setSize(bookList.getSize() - 1);System.out.println("删除成功！");}
}

3.查找书籍

package operation;import Demo.BookList;
import Demo.BookManage;import java.util.Scanner;public class Findoperation implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("查找书籍！");System.out.println("请输入要查找书籍的书名:");Scanner scanner = new Scanner(System.in);String name = scanner.next();int count = 0;for(int i = 0; i < bookList.getSize(); i++) {BookManage book = bookList.getBook(i);if(book.getName().equals(name)) {System.out.println(book);count++;}}if(count == 0) {System.out.println("没找到此书籍！");} else {System.out.println("共找到" + count + "本相同书籍！");}}
}

4.借阅书籍

package operation;import Demo.BookList;
import Demo.BookManage;import java.util.Scanner;public class BorrowOperation implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("借阅书籍！");System.out.println("请输入要借阅书籍的id:");Scanner scanner = new Scanner(System.in);String id = scanner.next();for (int i = 0; i < bookList.getSize(); i++) {BookManage book = bookList.getBook(i);if (!book.getId().equals(id)) {continue;}if (book.isBorrow()) {System.out.println("此书已经被借走了！");break;}book.setBorrow(true);System.out.println("借阅成功");}}
}

打印所有书籍信息

import Demo.BookList;
import Demo.BookManage;public class printAlloperation implements IOperation{@Overridepublic void work(BookList bookList) {int i;for (i = 0; i < bookList.getSize(); i++) {System.out.println(bookList.getBook(i));}System.out.println("共有" + bookList.getSize() + "本书籍");}
}

6.退出系统

package operation;import Demo.BookList;
import Demo.BookManage;import javax.imageio.plugins.bmp.BMPImageWriteParam;
import java.util.Scanner;public class ReturnOperation implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("归还书籍！");System.out.println("请输入要归还书籍的id:");Scanner scanner = new Scanner(System.in);String id = scanner.next();int i = 0;for(; i < bookList.getSize(); i++) {BookManage  book = bookList.getBook(i);if(!book.getId().equals(id)) {continue;}if(!book.isBorrow()) {System.out.println("这本书未借出去，归还失败！");}book.setBorrow(false);}}
}

抽象用户代码

package user;import Demo.BookList;
import operation.IOperation;abstract public class User {protected String name;protected IOperation[] operations;public User(String name) {this.name = name;}abstract public int menu();public void doOpration(int choice, BookList bookList) {operations[choice].work(bookList);}
}

管理员代码

package user;
import Demo.BookList;
import Demo.Delete;
import operation.*;import java.util.Scanner;public class Admin extends User {public Admin(String name) {super(name);operations = new IOperation[]{new ExitOperation(),new AddBookoperation(),new DeleteOperation(),new Findoperation(),new printAlloperation(),};}@Overridepublic int menu() {System.out.println("-------------------");System.out.println("hello" + name);System.out.println("1.增加书籍");System.out.println("2.删除书籍");System.out.println("3.查找书籍");System.out.println("4.打印所有信息");System.out.println("0.退出");System.out.println("-------------------");System.out.println("请输入您的选择：");Scanner scanner = new Scanner(System.in);int choice = scanner.nextInt();return choice;}
}

用户代码

package user;import operation.*;
import operation.IOperation.*;
import java.util.Scanner;public class NormalUser extends User {public NormalUser(String name) {super(name);operations = new IOperation[] {new ExitOperation(),new Findoperation(),new BorrowOperation(),new ReturnOperation(),};}@Overridepublic int menu() {System.out.println("----------------");System.out.println("hello" + name);System.out.println("1.查找书籍");System.out.println("2.借阅书籍");System.out.println("3.归还书籍");System.out.println("0.退出");System.out.println("----------------");System.out.println("请输入您的选择：");Scanner scanner = new Scanner(System.in);int choice = scanner.nextInt();return choice;}
}

结束

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基本思路

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