Java图书管理系统
文章目录
- 图书管理系统
- 对象
-
- 书
-
- 代码
- 书库
-
- 代码
- 用户
-
- 抽象类代码
- 管理者代码
- 普通用户代码
- 操作接口
-
- 接口
- AddOp
- BorrowOp
- DelOp
- DisplayOp
- ExitOp
- ReturnOp
- Main
- 结果
图书管理系统
Java的多态和接口 面向对象的思想很强烈
对象
书
代码
package book;
/**
* @author myy
*/
public class Book {
private String _name;//书名
private String _author;
private String _type;
private double _price;
public Book(String name, String author, String type, double price) {
this._name = name;
this._author = author;
this._type = type;
this._price = price;
}
public String get_name() {
return _name;
}
public void set_name(String _name) {
this._name = _name;
}
public String get_author() {
return _author;
}
public void set_author(String _author) {
this._author = _author;
}
public String get_type() {
return _type;
}
public void set_type(String _type) {
this._type = _type;
}
public double get_price() {
return _price;
}
public void set_price(double _price) {
this._price = _price;
}
@Override
public String toString() {
return
"{ 书名='" + _name + '\'' +
", 作者='" + _author + '\'' +
", 类型='" + _type + '\'' +
", 价格=" + _price + ','
;
}
}
书库
代码
package book;
import operator.IOperation;
import java.util.*;
import javafx.util.*;
import javafx.*;
import javax.swing.text.html.HTMLDocument;
/**
* @author myy
*/ //书架
public class BookList {
//ArrayList al = new ArrayList();
//单纯的数组是不行的，这里使用K-V的map
//int 用于记录存量
//这里使用内部类，但是不好看，可以自己封装一个kv键值对
protected Map<String, AbstractMap.SimpleEntry<Book,Integer>> _map= new HashMap<String, AbstractMap.SimpleEntry<Book,Integer> >();
private int sz;//记录有效数据个数
public BookList()//默认构造函数
{
_map.put("三国演义", new AbstractMap.SimpleEntry<>(new Book("三国演义", "罗贯中", "历史演义小说", 52.5), 5));
_map.put("水浒传", new AbstractMap.SimpleEntry<>(new Book("水浒传", "施耐庵", "章回体长篇小说", 45.5), 5));
_map.put("西游记", new AbstractMap.SimpleEntry<>(new Book("西游记", "吴承恩", "浪漫主义章回体长篇神魔小说", 56.5),6 ));
_map.put("红楼梦",new AbstractMap.SimpleEntry<>(new Book("红楼梦", "曹雪芹", "章回体类长篇小说", 78.5), 7));
_map.put("无职转生", new AbstractMap.SimpleEntry<>(new Book("无职转生", "理不尽な孫の手", "轻小说", 90.5), 10));
sz = _map.size();
}
public void Print()
{
for (Map.Entry<String, AbstractMap.SimpleEntry<Book, Integer>> entry : _map.entrySet()) {
System.out.printf("%s",entry.getValue().getKey());
System.out.printf("存量= "+ entry.getValue().getValue()+'}'+'\n');
}
}
public Map<String, AbstractMap.SimpleEntry<Book,Integer>> Get_map()
{
return _map;
}
}
用户
抽象类代码
package user;
import book.BookList;
import operator.IOperation;
/**
* @author myy
*/
public abstract class User {
protected String _name;
protected IOperation[] ioperations;//利用一个静态数组存放行为
public User(String name)
{
_name=name;
}
public abstract int menu();//菜单
public boolean DoOperation(int choice, BookList bookList)
{
return ioperations[choice].work(bookList);
}
}
管理者代码
package user;
import operator.*;
import java.util.Scanner;
/**
* @author myy
*/
public class AdminUser extends User {
public AdminUser(String name) {
super(name);
ioperations = new IOperation[]{
new ExitOp(),//0
new AddOp(),//1
new DelOp(),//2
new FindOp(),//3
new DisplayOp(),//4
};
}
//菜单
@Override
public int menu() {
System.out.println("********图书管理系统**************");
System.out.println("0.退出 ");
System.out.println("1. 添加图书 2.删除图书");
System.out.println("3. 查找图书 4.显示图书");
System.out.println("*****************************");
System.out.println("请输入你的操作:");
Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
return choice;
}
}
普通用户代码
package user;
import book.BookList;
import operator.*;
import java.sql.SQLClientInfoException;
import java.util.Scanner;
/**
* @author myy
*/
public class NormalUser extends User {
public NormalUser(String name) {
super(name);
super.ioperations = new IOperation[]{
new ExitOp(),//0
new BorrowOp(),//1
new ReturnOp(),//2
new DisplayOp()//3
};
}
//
public int menu() {
System.out.println("********图书管理系统************");
System.out.println("0退出 ");
System.out.println("1.借阅图书 2.归还图书");
System.out.println("3.显示图书 ");
System.out.println("*****************************");
System.out.println("请输入你的操作:");
Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
return choice;
}
}
操作接口
接口
package operator;
import book.Book;
import book.BookList;
/**
* @author myy
*/
public interface IOperation {
boolean work(BookList bookList);
}
AddOp
package operator;
import book.Book;
import book.BookList;
import java.util.AbstractMap;
import java.util.Scanner;
/**
* @author myy
*/
public class AddOp implements IOperation {
// private String _name;//书名
// private String _author;
// private String _type;
// private double _price;
// private boolean _isBorrow;//是否借出，默认是false
public boolean work(BookList bookList) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入图书名:");
String name = sc.nextLine();
System.out.println("请输入作者:");
String author = sc.nextLine();
System.out.println("请输入作品类型:");
String type = sc.nextLine();
System.out.println("请输入作品价格:");
double price = sc.nextDouble();
System.out.println("请输入书本数量:");
int cnt=sc.nextInt();
if (bookList.Get_map().containsKey(name)) {
bookList.Get_map().get(name).setValue(bookList.Get_map().get(name).getValue() + cnt);
} else {
bookList.Get_map().put(name,new AbstractMap.SimpleEntry<>(new Book(name,author,type,price),cnt));
}
return true;
}
}
BorrowOp
package operator;
import book.BookList;
import java.util.Scanner;
/**
* @author myy
*/
public class BorrowOp implements IOperation {
public boolean work(BookList bookList) {
DisplayOp displayOp =new DisplayOp();
displayOp.work(bookList);
System.out.println("请输入你要借的书名:");
Scanner sc=new Scanner(System.in);
String name=sc.nextLine();
if(bookList.Get_map().containsKey(name)){
Integer cnt= bookList.Get_map().get(name).getValue();
if(cnt>0){
bookList.Get_map().get(name).setValue(bookList.Get_map().get(name).getValue()-1);
}else
{
System.out.println("很抱歉,该书没有存量了");
}
}else
{
System.out.println("很抱歉,书库中没有"+name+"的书");
}
return true;
}
}
DelOp
package operator;
import book.BookList;
import sun.awt.geom.AreaOp;
import java.util.Scanner;
/**
* @author myy
*/
public class DelOp implements IOperation{
public boolean work(BookList bookList)
{
System.out.println("请输入书名:");
Scanner sc=new Scanner(System.in);
String name=sc.nextLine();
if ( bookList.Get_map().containsKey(name))
{
Integer cnt= bookList.Get_map().get(name).getValue();
if(cnt>0){
bookList.Get_map().get(name).setValue(bookList.Get_map().get(name).getValue()-1);
}else
{
//这里不删除该书的数据结构了，提醒书库缺书了
System.out.println("该书,书本缺书了");
}
}else
{
System.out.println("书本不存在");
}
return true;
}
}
DisplayOp
package operator;
import book.BookList;
/**
* @author myy
*/
public class DisplayOp implements IOperation {
public boolean work(BookList bookList) {
System.out.println("***********书单****************");
bookList.Print();
System.out.println("******************************\n");
return true;
}
}
ExitOp
package operator;
import book.BookList;
/**
* @author myy
*/
public class ExitOp implements IOperation {
public boolean work(BookList bookList) {
System.out.println("****************New_Young*******");
return false;
}
}
FindOp
package operator;
import book.BookList;
import java.util.Scanner;
/**
* @author myy
*/
public class FindOp implements IOperation{
public boolean work(BookList bookList)
{
System.out.println("请输入你要找的书名:");
Scanner sc=new Scanner(System.in);
String name=sc.nextLine();
if(bookList.Get_map().containsKey(name)){
System.out.println("书本存在");
}else
{
System.out.println("书本不存在");
}
return true;
}
}
ReturnOp
package operator;
import book.BookList;
import java.util.Scanner;
/**
* @author myy
*/
public class ReturnOp implements IOperation {
public boolean work(BookList bookList) {
System.out.println("请输入你要退还的书名:");
Scanner sc = new Scanner(System.in);
String name = sc.nextLine();
bookList.Get_map().get(name).setValue(bookList.Get_map().get(name).getValue() + 1);
System.out.println("退还书本成功");
return true;
}
}
Main
import book.BookList;
import user.AdminUser;
import user.NormalUser;
import java.util.Scanner;
import user.*;
/**
* @author myy
*/
public class Main {
//向上转型
public static User login() {
System.out.println("请输入你的姓名");
Scanner sc = new Scanner(System.in);
String username = sc.nextLine();
System.out.println("请输入你的身份 -> 0管理者 1普通用户 3.退出登录");
int choice = sc.nextInt();
if (choice == 0) {
return new AdminUser(username);
} else if (choice == 1) {
return new NormalUser(username);
} else {
return null;
}
}
public static void main(String[] args) {
//0. 准备数据
BookList bookList = new BookList();
//1.登陆
//*********精华内容：接口数组，多态*********
while (true) {
User user = login();
if (user == null) {
System.out.println("退出登录成功");
System.exit(0);
} else {
while (true) {
int choice = user.menu();
if (user.DoOperation(choice, bookList)) {
continue;
} else {
break;
}
}
}
}
}
}
结果
