Java实现图书管理系统的示例代码

时间:2022-11-22 谦虚的荆南芒果人气:1

User类

首先创建一个抽象类User，属性为姓名，提供了构造方法和get方法（因为本系统不需要修改名字，所以没有设置set方法），有一个able方法，让子类管理员和普通用户实现不同的界面和操作。

public abstract class User {
    private String name;
 
    public User(String name){
        this.name=name;
    }
    abstract void able();
 
    public String getName() {
        return name;
    }
}

管理员和普通用户类

这里定义了一个管理员和普通用户类继承User类，able方法里是菜单，可选择界面里的操作

public class AdminUser extends User{
 
 
    public AdminUser(String name) {
        super(name);
    }
 
    @Override
    void able() {
        BookList bookList=new BookList();
        while (true) {
            System.out.println("***********************");
            System.out.println("欢迎 "+getName()+" 登录图书管理系统");
            System.out.println("1.添加图书");
            System.out.println("2.查看全部图书");
            System.out.println("3.修改图书");
            System.out.println("4.删除图书");
            System.out.println("0.退出系统");
            System.out.println("请输入您的选择");
            Scanner sc=new Scanner(System.in);
            int i=sc.nextInt();
            Operate.operates[i].work(bookList);
        }
 
    }
 
}

public class normalUser extends User{
    public normalUser(String name) {
        super(name);
    }
 
    @Override
    void able() {
        BookList bookList=new BookList();
        while (true) {
            System.out.println("***********************");
            System.out.println("欢迎 "+getName()+" 登录图书管理系统");
            System.out.println("1.查找图书");
            System.out.println("2.借出图书");
            System.out.println("3.归还图书");
            System.out.println("0.退出系统");
            System.out.println("请输入您的选择");
            Scanner sc=new Scanner(System.in);
            int i=sc.nextInt();
            Operate.operates[i].work(bookList);
        }
    }
}

Book类

书类，属性有：书名，价格，状态（已借出/未被借出）

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package BOOK;
 
public class Book {
    private String name;
    private int prize;
    private boolean isBorrowed;
 
    public Book() {
    }
 
    public Book(String name, int prize) {
        this.name = name;
        this.prize = prize;
    }
 
    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }
 
    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }
 
    /**
     * 获取
     * @return prize
     */
    public int getPrize() {
        return prize;
    }
 
    /**
     * 设置
     * @param prize
     */
    public void setPrize(int prize) {
        this.prize = prize;
    }
 
    /**
     * 获取
     * @return isBorrowed
     */
    public boolean IsBorrowed() {
        return isBorrowed;
    }
    public void setNoBorrowed(){
        isBorrowed=false;
    }
    public void setYesBorrowed(){
        isBorrowed=true;
    }
 
    /**
     * 设置
     * @param isBorrowed
     */
    public void setIsBorrowed(boolean isBorrowed) {
        this.isBorrowed = isBorrowed;
    }
 
    public String toString() {
        return "Book{name = " + name + ", prize = " + prize + ", isBorrowed = "  +
                (isBorrowed==false?"未被借出":"已借出")+"}";
    }
}

BookList类

书架类，定义了一个能放10本书的数组，提供了一些操作方法，具体请看注释

package BOOK;
 
public class BookList {
    private Book[] books=new Book[10];
    private int size;//书的数量
    \\构造方法，默认放三本书进去
    public BookList() {
        books[0]=new Book("三国", 100000);
        books[1]=new Book("骆驼祥子", 10);
        books[2]=new Book("西游记", 90);
        this.size = 3;
    }
    \\添加方法
    public void add(Book book){
        books[size]=book;
        size++;
    }
    \\获取有多少本书
    public int getSize(){
        return size;
    }
    \\获取书架
    public Book[] getBooks(){
        return books;
    }
    \\返回书架上索引为index的书
    public Book getBook(int index){
        return books[index];
    }
    \\往索引index插入已初始化的book
    public void setBook(int index,Book book){
        books[index]=book;
    }
    \\删除书架上索引为index的书
    public void removeBook(int index){
        books[index]=null;
    }
    \\改变书的数量为i
    public void setSize(int i){
        size=i;
    }
 
}

Operate类

只是一个管理员的操作类，作为其他操作的父类，里面初始化一个操作数组，按照管理员类里输入的数字，再比照数组里操作的索引来实现不同的功能

work方法让子类去重写，来实现不同的功能

package Ac;
 
import BOOK.BookList;
 
public class Operate {
    static public Operate[] operates={
             new exitOperate(),\\退出系统
             new addOperate(),\\添加图书
            new showOperate(),\\展示所有图书
            new updateOperate(),\\修改某一本书
            new removeOperate()\\删除图书
     };
     public void work(BookList bookList){
     }
}

只是一个普通用户的操作类，和上面的一样，不在此过多赘述

package Pc;
 
import BOOK.BookList;
 
public class Operate {
    static public Operate[] operates={
            new exitOperate(),\\退出系统
            new findOperate(),\\查找图书
            new borrowBook(),\\借书
            new returnBook()\\归还图书
    };
    public void work(BookList bookList){
    }
}

退出系统

我相信不用多讲，各位dddd

package Ac;
 
import BOOK.BookList;
 
public class exitOperate extends Operate{
 
 
    @Override
    public void work(BookList bookList) {
        System.out.println("退出成功");
        System.exit(0);
    }
}

addOperate 添加书籍（管理员）

package Ac;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class addOperate extends Operate{
 
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入书名");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        \\查找书名，相同则录入失败
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books=bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)){
                System.out.println("已有此书，录入失败");
                return;
            }
        }
        System.out.println("请输入价格");
        int prize=sc.nextInt();
        \\把书放入书架
        Book book=new Book(name,prize);
        bookList.add(book);
        System.out.println("录入成功");
    }
}

展示所有图书（管理员）

很简单，遍历书架上所有书就完事了

package Ac;
 
import BOOK.BookList;
 
public class showOperate extends Operate{
    @Override
    public void work(BookList bookList) {
        if (bookList.getSize()==0){
            System.out.println("没有书");
        }
        for (int i = 0; i < bookList.getSize(); i++) {
            System.out.println(bookList.getBook(i));
        }
    }
}

修改图书（管理员）

package Ac;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class updateOperate extends Operate{
    @Override
    public void work(BookList bookList) {
 
        System.out.println("请输入您要修改的书的名字");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        \\查找录入的书
        int i=findBook(bookList,name);
        if (i!=-1){
            \\录入书名，如果书名存在则录入失败
            System.out.println("请输入修改后书名");
            String newName=sc.next();
            for (int j = 0; j < bookList.getSize(); j++) {
                Book[] books=bookList.getBooks();
                if (bookList.getBook(j).getName().equals(newName)){
                    System.out.println("已有此书，录入失败");
                    return;
                }
            }
 
            System.out.println("请输入修改后价格");
            int prize=sc.nextInt();
            \\添加书到书架
            Book book=new Book(newName,prize);
            bookList.setBook(i,book);
            System.out.println("修改成功");
            return;
        }
 
    }
    public int findBook(BookList bookList,String name){
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books=bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)){
                return i;
            }
        }
        System.out.println("没有此书！！修改失败");
        return -1;
    }
}

删除图书（管理员）

与修改差不多，在此不过多赘述

package Ac;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class removeOperate extends Operate{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入要删除的图书");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        int i=findBook(bookList,name);
        if(i!=-1){
            for (int j = i; j < bookList.getSize()-1; j++) {
                Book book=bookList.getBook(j+1);
                bookList.setBook(j,book);
            }
            bookList.setSize(bookList.getSize()-1);
            bookList.removeBook(bookList.getSize());
            System.out.println("删除成功");
        }
 
    }
    public int findBook(BookList bookList,String name){
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books=bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)){
                return i;
            }
        }
        System.out.println("没有此书！！删除失败");
        return -1;
    }
}

查找某一本书（普通用户）

package Pc;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class findOperate extends Operate{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入您要查找的书名");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        findBook(bookList,name);
    }
    public void findBook(BookList bookList,String name){
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books=bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)){
                System.out.println("找到了！！");
                System.out.println(bookList.getBook(i));
                return;
            }
        }
        System.out.println("没有此书！!");
 
    }
}

借出图书（普通用户）

借书原理很简单，芝士把某一本书拿出来修改状态再塞回书架

package Pc;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class borrowBook extends Operate{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入您要借书的书名");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        int i=findBook(bookList,name);
        if (i!=-1){
            bookList.getBook(i).setYesBorrowed();;
            System.out.println("成功借出");
            return;
        }
 
    }
    public int findBook(BookList bookList,String name){
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books=bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)){
                return i;
            }
        }
        System.out.println("没有此书！！");
        return -1;
    }
}

归还图书（普通用户）

与上面的借书操作原理相同

package Pc;
 
import BOOK.Book;
import BOOK.BookList;
 
import java.util.Scanner;
 
public class returnBook extends Operate{
    @Override
    public void work(BookList bookList) {
        System.out.println("请输入您要归还的书名");
        Scanner sc=new Scanner(System.in);
        String name=sc.next();
        int i=findBook(bookList,name);
        if (i!=-1){
            bookList.getBook(i).setNoBorrowed();;
            System.out.println("成功归还");
            return;
        }
 
    }
    public int findBook(BookList bookList,String name){
        for (int i = 0; i < bookList.getSize(); i++) {
            Book[] books = bookList.getBooks();
            if (bookList.getBook(i).getName().equals(name)) {
                return i;
            }
        }
        System.out.println("没有此书！！");
        return -1;
    }
}

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