Java-图书管理系统(控制台程序)

Java-图书管理系统(控制台程序)

作者有话要说:

关于这篇博客，主要记录上课的一个作业，作业任务要求如下(一.图书管理系统任务书)，该项目主要就是对JavaSE部分知识进行练习(主要涉及封装继承多态集合)，没有和数据后端进行交互，也没有使用任何框架。

目录

• • 一.图书管理系统任务书:
  • 二.项目结构
  • 三.运行效果和源码下载地址

一.图书管理系统任务书:

描述:
图书管理系统会因为图书的数量、种类、提供的 *** 作等不同而具有不同的复杂度。基本信息的维护、图书借阅、归还及查询等 *** 作通常是图书管理系统的基本功能。在规模较大、业务较多的图书馆还需要图书的库存管理、销售管理等更加复杂的功能。
相关数据表格:




功能实现要求：

1. 实现接口IAction，其包含add（插入）、del（删除）、getCount（数据大小 ）、getlistInfo（列表输出）和Find(查找)五个方法。图书信息类、读者信息类、借阅信息类和用户信息类实现IAction接口的方法，要求使用集合框架技术。测试类中分别对各类进行插入、删除、大小 、列表输出、查询等相关方法进行测试。
   2.实现图书管理系统的用户交互功能，包括用户菜单的显示与用户选择菜单后对数据的新增、删除、查询、列表等功能（分别实现对图书信息、读者信息、借阅信息和用户信息的 *** 作）。具体实现的功能菜单如下：
   0：系统退出
   1：图书信息列表显示
   2：图书信息新增
   3：图书信息删除
   4：图书信息查找（按书名查找）
   6：读者信息列表显示
   7：读者信息新增
   8：读者信息删除
   9：读者信息查找（按姓名查找）
   10：借阅信息列表显示
   11：借阅信息新增
   12：借阅信息删除
   13：借阅信息查找（按书名查找）
   14：用户信息列表显示
   15：用户信息新增
   16：用户信息删除
   17：用户信息查找（按用户名查找）

二.项目结构

1.项目框架

2.SystemData.java:
由于没有和数据库进行数据交互，该系统的数据通过静态属性进行对象的共享:

相关学习链接:
java基础回顾—static关键字

3.LibraySystem.java
LibraySystem.java就是该图书管理的整体框架:

通过start()启动该图书管理系统:

由于几个功能模块的功能就只有CRUD *** 作,所用使用一个复合方法，参数为IAction接口(多态的练习):

完整代码:

package com.zhumin.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

import com.zhumin.librarysystem.ben.Book;
import com.zhumin.librarysystem.ben.Borrow;
import com.zhumin.librarysystem.ben.Reader;
import com.zhumin.librarysystem.ben.User;
import com.zhumin.service.IAction;


public class LibraySystem {
	public static MapMANAGERVIEW_MENU,LIBRAYSYSTE_MMENU;
	//初始化系统数据
	static{
		SystemData.BORROWLIST_SYSTEM=new ArrayList<>();
		SystemData.TEST_USER=new User("10001", "admin", "123456", true);
		
		//图书信息
		ArrayListaBooks=new ArrayList<>();
		aBooks.add(new Book("AA001001", "Java基础入门", "计算机", "张三", "无", "清华大学出版社", new Date(), 44.5,50));
		aBooks.add(new Book("AA001002", "Java编程思想", "计算机", "李四", "无", "机械工业出版社", new Date(), 108,100));
		aBooks.add(new Book("AA001003", "数据结构", "计算机", "王五", "无", "电子工业出版社", new Date(), 88,50));
		SystemData.BOOKLIST_SYSTEM=aBooks;
		
		//用户信息
		ArrayListaUsers=new ArrayList<>();
		aUsers.add(SystemData.TEST_USER);
		aUsers.add(new User("1001", "张三", "123456", false));
		aUsers.add(new User("1002", "李四", "123456", false));
		aUsers.add(new User("1003", "王麻子", "123456", false));
		aUsers.add(new User("1004", "王宝强", "123456", false));
		aUsers.add(new User("1005", "卢本伟", "123456", false));
		SystemData.USERLIST_SYSTEM=aUsers;
		
		//读者信息
		ArrayListaReaders=new ArrayList<>();
		aReaders.add(new Reader("1001", "张三", "普通读者", "男", 5, 30));
		aReaders.add(new Reader("1002", "李四", "普通读者", "男", 5, 30));
		aReaders.add(new Reader("1003", "王麻子", "普通读者", "男", 5, 30));
		aReaders.add(new Reader("1004", "王宝强", "普通读者", "男", 5, 30));
		aReaders.add(new Reader("1005", "卢本伟", "普通读者", "男", 5, 30));
		SystemData.READERLIST_SYSTEM=aReaders;
		
		//借阅信息
		ArrayListaBorrows=new ArrayList<>();
		aBorrows.add(new Borrow("AA001001", "123456789", "1001", "2021-10-27", "未还", false));
		aBorrows.add(new Borrow("AA001001", "985522212", "1002", "2021-10-27", "未还", false));
		aBorrows.add(new Borrow("AA001001", "464682223", "1002", "2021-10-27", "未还", false));
		aBorrows.add(new Borrow("AA001001", "135656132", "1003", "2021-10-27", "未还", false));
		
		//菜单信息初始化
		MANAGERVIEW_MENU=new HashMap();
		MANAGERVIEW_MENU.put(1, "1:列表显示");
		MANAGERVIEW_MENU.put(2, "2:信息新增");
		MANAGERVIEW_MENU.put(3, "3:信息删除");
		MANAGERVIEW_MENU.put(4, "4:信息查找");
		MANAGERVIEW_MENU.put(5, "5:返回上一级");
		
		LIBRAYSYSTE_MMENU=new HashMap<>();
		LIBRAYSYSTE_MMENU.put(0, "你已进入退出模块~");
		LIBRAYSYSTE_MMENU.put(1, "欢迎来到图书管理模块~");
		LIBRAYSYSTE_MMENU.put(2, "欢迎来到借阅管理模块~");
		LIBRAYSYSTE_MMENU.put(3, "欢迎来到读者管理模块~");
		LIBRAYSYSTE_MMENU.put(4, "欢迎来到用户管理模块~");
		
	}
	
	public void start() {
		//程序运行
		System.out.println("----------------图书系统----------------");
		System.out.println("欢迎来到图书系统!");
			if (!SystemData.STATUS_USER) {
				//进行用户登入
				login();
			}
			System.out.println("欢迎"+SystemData.CURRENT_USER.getUsername()+"进入图书管理系统~");
			while(SystemData.STATUS_USER){
				System.out.println("图书系统功能面板:");
				System.out.println("0:系统退出,1:图书管理页面,2:借阅管理页面,3:读者信息页面,4:用户信息页面");
				System.out.println("输入你的选项:");
				int num=new Scanner(System.in).nextInt();
				//提示用户进入到哪一个模块
				if (num>=0&&num<=LIBRAYSYSTE_MMENU.size()) {
					System.out.println(LIBRAYSYSTE_MMENU.get(num));
				}
				switch (num) {
				case 0:
					exit();
					break;
				case 1:
					operateReuse(new Book(),MANAGERVIEW_MENU);
					break;
				case 2:
					operateReuse(new Borrow(),MANAGERVIEW_MENU);
					break;
				case 3:
					operateReuse(new Reader(),MANAGERVIEW_MENU);
					break;
				case 4:
					operateReuse(new User(),MANAGERVIEW_MENU);
				default:
					System.out.println("无效输入,请重新输入！");
					break;
				}
			}
	}

	private void login() {
		//设置登入表示为true表示运行
		SystemData.STATUS_USER=true;
		if (SystemData.CURRENT_USER==null) {
			while(true){
				System.out.println("当前没有用户进行登入！");
				System.out.println("1:登入用户,2:注册用户");
				System.out.println("输入你的选项数字:");
				int num=new Scanner(System.in).nextInt();
				if (num==2) {
					new User().add();
					break;
				}else if (num==1) {
					String userName,passWord;
					System.out.println("输入账号:");
					userName=new Scanner(System.in).nextLine();
					System.out.println("输入密码:");
					passWord=new Scanner(System.in).nextLine();
					//实例化User对象
					User user=new User();
					user.setUsername(userName);
					user.setPassword(passWord);
					//进行登入
					if (user.userLogin(user)) {
						System.out.println("登入成功!");
						break;
					}else {
						System.out.println("登入失败!");
					}
				}else {
					System.out.println("无效输入，请重新输入!");
				}
			}
		}
	}

	//退出系统
	private void exit() {
		// TODO Auto-generated method stub
		SystemData.STATUS_USER=false;
		System.out.println("欢迎下次光临!");
		System.out.println("已经退出系统!");
		return;
	}
	
	//功能选项复用方法
	private void operateReuse(IAction iAction,Map menu) {
		// TODO Auto-generated method stub
		while (true) {
			showMenu(menu);
			switch (new Scanner(System.in).nextInt()) {
			case 1:
				iAction.getlistInfo();
				break;
			case 2:
				iAction.add();
				break;
			case 3:
				iAction.del();
				break;
			case 4:
				iAction.find();
				break;
			case 5:
				return;
			default:
				System.out.println("无效输入,请重新输入！");
				break;
			}
		}
	}

	//显示菜单复用方法
	private void showMenu(Map menu) {
		System.out.println("菜单:");
		// TODO Auto-generated method stub
		for (Map.Entry entry :menu.entrySet()) {
			System.out.println(entry.getValue());
		}
		System.out.println("输入你的选项:");
	}
			
			
}

4.Book,Borrow,Reader,User
Book,Borrow,Reader,User实现IAction接口，并且实现接口的方法:
(这里的CRUD *** 作其实就是集合的 *** 作，对集合知识进行练习)
Book.java:

package com.zhumin.librarysystem.ben;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;

import com.zhumin.controller.SystemData;
import com.zhumin.service.IAction;


public class Book implements IAction{
			private String id="AA0000001";
			private String bookname;
			private String booktype="科技";
			private String author;
			private String translator;
			private String publisher;
			private Date publish_time;
			private double price=28;
			private int stock=1;

			//构造方法
			public Book(String id, String bookname, String booktype, String author, String translator, String publisher,
					Date publish_time, double price, int stock) {
				this.id = id;
				this.bookname = bookname;
				this.booktype = booktype;
				this.author = author;
				this.translator = translator;
				this.publisher = publisher;
				this.publish_time = publish_time;
				this.price = price;
				this.stock = stock;
			}
			public Book() {
				
			}
			//属性的get和set访问器
			public String getId() {
				return id;
			}
			public void setId(String id) {
				this.id = id;
			}
			public String getBookname() {
				return bookname;
			}
			public void setBookname(String bookname) {
				this.bookname = bookname;
			}
			public String getBooktype() {
				return booktype;
			}
			public void setBooktype(String booktype) {
				this.booktype = booktype;
			}
			public String getAuthor() {
				return author;
			}
			public void setAuthor(String author) {
				this.author = author;
			}
			public String getTranslator() {
				return translator;
			}
			public void setTranslator(String translator) {
				this.translator = translator;
			}
			public String getPublisher() {
				return publisher;
			}
			public void setPublisher(String publisher) {
				this.publisher = publisher;
			}
			public Date getPublish_time() {
				return publish_time;
			}
			public void setPublish_time(Date publish_time) {
				this.publish_time = publish_time;
			}
			public double getPrice() {
				return price;
			}
			public void setPrice(double price) {
				this.price = price;
			}
			public int getStock() {
				return stock;
			}
			public void setStock(int stock) {
				this.stock = stock;
			}
			@Override
			public String toString() {
				return "图书编号:" + id + ", 图书名:" + bookname + ", 图书类型:" + booktype + ", 作者:" + author
						+ ", 翻译:" + translator + ", 出版社:" + publisher + ", 出版时间:" + new SimpleDateFormat("yyyy年MM月dd日 hh时mm分ss秒").format(publish_time)
						+ ", 价格:" + price + ", 库存:" + stock + "]";
			}
			@Override
			public boolean add() {
				Scanner scanner=new Scanner(System.in);
				Book book=new Book();
				System.out.println("输入图书编号:");
				book.setId(new Scanner(System.in).nextLine());
				System.out.println("输入图书名称");
				book.setBookname(new Scanner(System.in).nextLine());
				System.out.println("输入图书类别");
				book.setBooktype(new Scanner(System.in).nextLine());
				System.out.println("输入图书作者");
				book.setAuthor(new Scanner(System.in).nextLine());
				System.out.println("输入图书译者");
				book.setTranslator(new Scanner(System.in).nextLine());
				System.out.println("输入图书出版社");
				book.setPublisher(new Scanner(System.in).nextLine());
				System.out.println("输入图书定价");
				book.setPrice(new Scanner(System.in).nextDouble());
				System.out.println("输入图书库存数量");
				book.setStock(new Scanner(System.in).nextInt());
				book.setPublish_time(new Date());
				//将信息加入到用户集合中去
				SystemData.BOOKLIST_SYSTEM.add(book);
				return true;
			}
			@Override
			public boolean del() {
				System.out.println("输入你要删除图书的编号:");
				String num=new Scanner(System.in).nextLine();
				ArrayListaBooks=SystemData.BOOKLIST_SYSTEM;
				for (int i = 0; i < aBooks.size(); i++) {
					if (num.equals(aBooks.get(i).getId())) {
						SystemData.BOOKLIST_SYSTEM.remove(i);
						System.out.println("删除成功!");
						return true;
					}
				}
				
				System.out.println("删除失败!");
				return false;
			}
			@Override
			public int getCount() {
				return SystemData.BOOKLIST_SYSTEM.size();
			}
			@Override
			public void getlistInfo() {
				ArrayListaBooks=SystemData.BOOKLIST_SYSTEM;
				if (aBooks.size()>0) {
					for(Book book:aBooks){
						System.out.println(book.toString());
					}	
				}else {
					System.out.println("无任何信息~");
				}
			}
			@Override
			public boolean find() {
				System.out.println("输入你要查询图书的编号:");
				String num=new Scanner(System.in).nextLine();
				ArrayListaBooks=SystemData.BOOKLIST_SYSTEM;
				for(Book book:aBooks){
					if (num.equals(book.getId())) {
						System.out.println(book.toString());
						return true;
					}
				}
				System.out.println("当前图书系统不存在该图书!");
				return false;
			}
			
			
			
			
			
}

Borrow.java:

package com.zhumin.librarysystem.ben;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

import com.zhumin.controller.SystemData;
import com.zhumin.librarysystem.util.CreateSerialNumberUtil;
import com.zhumin.service.IAction;


public class Borrow  implements IAction{
				private String book_id;
				private String id;//流水号
				private String reader_id;
				private String borrow_date;
				private String back_date;
				private boolean if_back;
				//构造方法
				public Borrow(String book_id, String id, String reader_id, String borrow_date, String back_date,
						boolean if_back) {
					this.book_id = book_id;
					this.id = id;
					this.reader_id = reader_id;
					this.borrow_date = borrow_date;
					this.back_date = back_date;
					this.if_back = if_back;
				}
				public Borrow() {
				}
				//属性的get和set访问器
				public String getBook_id() {
					return book_id;
				}
				public void setBook_id(String book_id) {
					this.book_id = book_id;
				}
				public String getId() {
					return id;
				}
				public void setId(String id) {
					this.id = id;
				}
				public String getReader_id() {
					return reader_id;
				}
				public void setReader_id(String reader_id) {
					this.reader_id = reader_id;
				}
				public String getBorrow_date() {
					return borrow_date;
				}
				public void setBorrow_date(String borrow_date) {
					this.borrow_date = borrow_date;
				}
				public String getBack_date() {
					return back_date;
				}
				public void setBack_date(String back_date) {
					this.back_date = back_date;
				}
				public boolean isIf_back() {
					return if_back;
				}
				public void setIf_back(boolean if_back) {
					this.if_back = if_back;
				}
				@Override
				public String toString() {
					return "图书编号:" + book_id + ", 流水号:" + id + ", 读者编号:" + reader_id + ", 借书时间:"
							+ borrow_date + ", 归还时间:" + back_date + ", 是否归还:" + (if_back==true?"归还":"未归还") + "";
				}
				@Override
				public boolean add() {

				Scanner scanner=new Scanner(System.in);	
				System.out.println("输入图书编号:");
				String id=scanner.nextLine();
				System.out.println("输入读者编号:");
				String readerId=scanner.nextLine();
				System.out.println("输入借书时间:");
				String time1=scanner.nextLine();
				System.out.println("输入还书时间:");
				String time2=scanner.nextLine();
				boolean data=false;
				while (true) {
					System.out.println("是否还书:1:是,2:否");
					int if_data=scanner.nextInt();
					if (if_data==1) {
						data=true;
						break;
					}else if (if_data==2) {
						data=false;
						break;
					}else {
						System.out.println("请重新输入!");
					}
				}
				Borrow borrow=new Borrow(id, CreateSerialNumberUtil.getSerialBorrowNumber(id), readerId,time1, time2,data);
				//将借阅图书信息加入到集合中去
				SystemData.BORROWLIST_SYSTEM.add(borrow);
					return false;
				}
				@Override
				public boolean del() {
					System.out.println("输入你要删除借阅信息的图书编号:");
					String num=new Scanner(System.in).nextLine();
					ArrayListaBorrows=SystemData.BORROWLIST_SYSTEM;
					for (int i = 0; i < aBorrows.size(); i++) {
						 if (aBorrows.get(i).getBook_id().equals(num)) {
							 SystemData.BORROWLIST_SYSTEM.remove(i);
							 System.out.println("删除成功!");
							 return true;
						}
					}
					System.out.println("删除失败!");
					return false;
				}
				@Override
				public int getCount() {
					return SystemData.BORROWLIST_SYSTEM.size();
				}
				@Override
				public void getlistInfo() {
					ArrayListaBorrows=SystemData.BORROWLIST_SYSTEM;
					if (aBorrows.size()>0) {
						for(Borrow borrow:aBorrows){
							System.out.println(borrow.toString());
						}	
					}else {
						System.out.println("无任何信息~");
					}
					
					
				}
				@Override
				public boolean find() {
					System.out.println("输入你要查询借阅信息的读者编号:");
					String num=new Scanner(System.in).nextLine();
					ArrayListaBorrows=SystemData.BORROWLIST_SYSTEM;
					for(Borrow borrow:aBorrows){
						if (num.equals(borrow.getReader_id())) {
							System.out.println(borrow.toString());
							return true;
						}
					}
					System.out.println("当前图书系统不存在该读者信息!");
					return false;
				}
				
			
					
				
				
}

Reader.java:

package com.zhumin.librarysystem.ben;

import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;

import com.zhumin.controller.SystemData;
import com.zhumin.service.IAction;


public class Reader implements IAction{
			private String id="AA000001";
			private String readername;
			private String readertype;
			private String sex;
			private int max_num;
			private int days_num;
			//构造方法
			public Reader(String id, String readername, String readertype, String sex, int max_num, int days_num) {
				this.id = id;
				this.readername = readername;
				this.readertype = readertype;
				this.sex = sex;
				this.max_num = max_num;
				this.days_num = days_num;
			}
			public Reader() {
			}
			
			
			//属性的get()set()访问器
			public String getId() {
				return id;
			}
			public void setId(String id) {
				this.id = id;
			}
			public String getReadername() {
				return readername;
			}
			public void setReadername(String readername) {
				this.readername = readername;
			}
			public String getReadertype() {
				return readertype;
			}
			public void setReadertype(String readertype) {
				this.readertype = readertype;
			}
			public String getSex() {
				return sex;
			}
			public void setSex(String sex) {
				this.sex = sex;
			}
			public int getMax_num() {
				return max_num;
			}
			public void setMax_num(int max_num) {
				this.max_num = max_num;
			}
			public int getDays_num() {
				return days_num;
			}
			public void setDays_num(int days_num) {
				this.days_num = days_num;
			}
			@Override
			public String toString() {
				return "读者编号:" + id + ", 读者姓名:" + readername + ", 读者类型:" + readertype + ", 读者性别:" + sex
						+ ", 最大可借书数：" + max_num + ", 可借天数:" + days_num;
			}
			@Override
			public boolean add() {
				Reader reader=new Reader();
				Scanner objScanner=new Scanner(System.in);
				System.out.println("请输入读者编号:");
				reader.setId(objScanner.nextLine());
				System.out.println("请输入读者姓名:");
				reader.setReadername(objScanner.nextLine());
				//System.out.println("请输入读者类型");
				reader.setReadertype("普通读者");
				System.out.println("请输入读者性别:1:男,2:女");
				while (true) {
					int num=objScanner.nextInt();
					if (num==1) {
						reader.setSex("男");
						break;
					}else if (num==2) {
						reader.setSex("女");
						break;
					}else {
						System.out.println("输入有误，请重新输入!");
					}
				}
				//采用默认值
				reader.setMax_num(5);
				reader.setDays_num(15);
				SystemData.READERLIST_SYSTEM.add(reader);
				return SystemData.CURRENT_READER!=null?true:false;
			}
			@Override
			public boolean del() {
				System.out.println("输入你要删除读者的编号:");
				String num=new Scanner(System.in).nextLine();
				ArrayListaReaders=SystemData.READERLIST_SYSTEM;
				for (int i = 0; i < aReaders.size(); i++) {
					if (aReaders.get(i).getId().equals(num)) {
						SystemData.READERLIST_SYSTEM.remove(i);
						System.out.println("删除成功!");
						return true;
					}
				}
				System.out.println("删除失败!");
				return false;
			}
			@Override
			public int getCount() {
				// TODO Auto-generated method stub
				return SystemData.READERLIST_SYSTEM.size();
			}
			@Override
			public void getlistInfo() {
				// TODO Auto-generated method stub
				ArrayListaReaders=SystemData.READERLIST_SYSTEM;
				if (aReaders.size()>0) {
					for(Reader reader:aReaders){
						System.out.println(reader.toString());
					}	
				}else {
					System.out.println("无任何信息~");
				}
			}
			@Override
			public boolean find() {
				System.out.println("输入你要查询读者的编号:");
				String num=new Scanner(System.in).nextLine();
				ArrayListaReaders=SystemData.READERLIST_SYSTEM;
				for(Reader reader:aReaders){
					if (num.equals(reader.getId())) {
						System.out.println(reader.toString());
						return true;
					}
				}
				System.out.println("当前图书系统不存在该读者信息!");
				return false;
			}
			
			

			
}

User.java:

package com.zhumin.librarysystem.ben;

import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;

import com.zhumin.controller.SystemData;
import com.zhumin.librarysystem.util.CreateSerialNumberUtil;
import com.zhumin.service.IAction;



public class User implements IAction{
				private String id;//流水号
				private String username;
				private String password;
				private boolean is_admin;
				//构造方法
				public User(String id, String username, String password, boolean is_admin) {
					this.id = id;
					this.username = username;
					this.password = password;
					this.is_admin = is_admin;
				}

				public User() {
				}
				//属性的get()set()访问器
				public String getId() {
					return id;
				}

				public void setId(String id) {
					this.id = id;
				}

				public String getUsername() {
					return username;
				}

				public void setUsername(String username) {
					this.username = username;
				}

				public String getPassword() {
					return password;
				}

				public void setPassword(String password) {
					this.password = password;
				}

				public boolean isIs_admin() {
					return is_admin;
				}

				public void setIs_admin(boolean is_admin) {
					this.is_admin = is_admin;
				}

				@Override
				public String toString() {
					return "用户编号:" + id + ", 用户姓名:" + username + ", 用户密码:" + password + ", 是否为管理员:"
							+ (is_admin==true?"是":"不是" );
				}

				@Override
				public boolean add() {
					User createUser=new User();
					Scanner objScanner=new Scanner(System.in);
					System.out.println("请输入账号:");
					createUser.setUsername(objScanner.nextLine());
					System.out.println("请输入密码:");
					createUser.setPassword(objScanner.nextLine());
					createUser.setId(CreateSerialNumberUtil.getSerialNumber());
					while(true){
						System.out.println("是否为管理员,1表示是,2表示不是");
						int num=objScanner.nextInt();
						if (num==1) {
							createUser.setIs_admin(true);
							break;
						}else if (num==2) {
							createUser.setIs_admin(false);
							break;
						}
						System.out.println("格式不对,请重新输入!");
					}
					 SystemData.USERLIST_SYSTEM.add(createUser);
					return SystemData.CURRENT_USER!=null?true:false;
				}

				@Override
				public boolean del() {
					System.out.println("输入你要删除的用户账号:");
					String num=new Scanner(System.in).nextLine();
					ArrayListaUsers=SystemData.USERLIST_SYSTEM;
					for (int i = 0; i < aUsers.size(); i++) {
						if (aUsers.get(i).getUsername().equals(num)) {
							SystemData.USERLIST_SYSTEM.remove(i);
							System.out.println("删除成功！");
							return true;
						}
					}
					System.out.println("删除失败!");
					return false;
				}

				@Override
				public int getCount() {
					// TODO Auto-generated method stub
					return SystemData.USERLIST_SYSTEM.size();
				}

				@Override
				public void getlistInfo() {
					// TODO Auto-generated method stub
					ArrayListaUsers=SystemData.USERLIST_SYSTEM;
					if (aUsers.size()>0) {
						for(User user:aUsers){
							System.out.println(user.toString());
						}	
					}else {
						System.out.println("无任何信息~");
					}
				}

				@Override
				public boolean find() {
					System.out.println("输入你要查询用户的账号:");
					String num=new Scanner(System.in).nextLine();
					User user=getUserInfoByUserName(num);
					if (user!=null) {
						System.out.println(user.toString());
						return true;
					}else {
						System.out.println("当前图书系统不存在该用户信息!");	
					}
					return false;
				}
				
				//用户登入
				public boolean userLogin(User user) {
					ArrayListaUsers=SystemData.USERLIST_SYSTEM;
					   for (User user2 : aUsers) {
						   if (user2.getUsername().equals(user.getUsername())) {
							   if (user2.getPassword().equals(user.getPassword())) {
								   //将当前用户对象设置为
								   SystemData.CURRENT_USER=user2;
								 return true;
							   }
						   }
					   }
						return false;
				}
				
				//通过用户名获取用户信息
				public User getUserInfoByUserName(String userName) {
					ArrayListaUsers=SystemData.USERLIST_SYSTEM;
					for(User user:aUsers){
						if (userName.equals(user.getUsername())) {
							System.out.println(user.toString());
							return user;
						}
					}
					return null;
				}
				
				
}

5:CreateSerialNumberUtil工具类用于生成流水号

package com.zhumin.librarysystem.util;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;



public class CreateSerialNumberUtil {
				
	public static String getSerialNumber() {
	    return new SimpleDateFormat("yyyyMMddhhmmss").format(new Date())+UUID.randomUUID().toString().replaceAll("-", "");
	}
	
	
	public static String getSerialBorrowNumber(String id) {
	    return new SimpleDateFormat("yyyyMMddhhmmss").format(new Date())+id;
	}
}

7:IAction接口

package com.zhumin.service;



public interface IAction {
		public boolean add();
		public boolean del();
		public int	getCount();
		public void getlistInfo();
		public boolean find();
}

8:Test测试类

三.运行效果和源码下载地址

百度网盘下载地址:
链接：https://pan.baidu.com/s/170GZr24ohtp-EiqXujSenw
提取码：9999