java idea中做一个简易的图书管理系统（控制台输入输出，无数据库）
1：先创建增删改查四个接口
（1）QueryBook查询接口
package com.by.dao;
import com.by.entity.Book;
public interface QueryBook {
/**
* 查询所有图书信息
* @param bs
*/
void selectBook(Book[] bs);
/**
* 根据名字查询一个图书信息
* @param bookName
* @param bs
*/
void selectBookByBookname(String bookName,Book[] bs);
}
（2）AddBook 增加接口
package com.by.dao;
import com.by.entity.Book;
public interface AddBook {
/**
* 在原图书数组末尾添加一个图书信息
* @param book 被添加的图书对象
* @param bs 图书数组
* @return
*/
Book [] insertBook(Book book,Book[] bs);
}
（3）RemoveBook删除接口
package com.by.dao;
import com.by.entity.Book;
public interface RemoveBook {
/**
* 删除指定图书对象
* @param bookName 删除的图书名，图书对象
* @param bs 返回的数组
* @return
*/
Book[] deleteBooksByName(String bookName, Book[] bs);
}
（4）UpdateBook修改接口
package com.by.dao;
import com.by.entity.Book;
public interface UpdateBook {
/**
* 根据图书名修改图书信息
* @param bookName 图书名
* @param bs 数组中内容改变
*/
void setBookByName(String bookName,Book book,Book []bs);
}
2：创建用户类实现查询接口
package com.by.entity;
import com.by.dao.QueryBook;
import java.util.Scanner;
public class User implements QueryBook {
private String userName;
private String password;
public User() {
}
public User(String userName, String password) {
this.userName = userName;
this.password = password;
}
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;
}
@Override
public void selectBook(Book[] bs) {
for (int i = 0; i 3：创建普通用户继承用户，管理员账户继承用户类并实现增删改接口
（1）普通用户NormalUser类
package com.by.entity;
import com.by.dao.QueryBook;
import java.util.Scanner;
public class NormalUser extends User {
public NormalUser() {
}
public NormalUser(String userName, String password) {
super(userName, password);
}
/* @Override
public void login() {
System.out.println("欢迎使用图书管理系统，请先登录");
Scanner sc=new Scanner(System.in);
System.out.println("请输入用户名：");
String name=sc.nextLine();
if (name.equals(this.getUserName())){
System.out.println("请输入密码：");
String password=sc.nextLine();
if(password.equals(this.getPassword())){
System.out.println("登录成功");
}else{
System.out.println("用户名或密码有误");
}
}else{
System.out.println("请输入密码：");
String password1=sc.nextLine();
System.out.println("用户名或密码错误");
}
}*/
}
（2）管理员用户AdminUser类
package com.by.entity;
import com.by.dao.AddBook;
import com.by.dao.QueryBook;
import com.by.dao.RemoveBook;
import com.by.dao.UpdateBook;
import java.util.Scanner;
public class AdminUser extends User implements AddBook, UpdateBook, RemoveBook {
public AdminUser() {
}
public AdminUser(String userName, String password) {
super(userName, password);
}
Scanner sc = new Scanner(System.in);
@Override
public Book[] insertBook(Book book, Book[] bs) {
Book[] bs1 = new Book[bs.length + 1];
for (int i = 0; i < bs.length; i++) {
bs1[i] = bs[i];
}
bs1[bs.length] = book;
return bs1;
}
@Override
public Book[] deleteBooksByName(String bookName, Book[] bs) {
Book[] bs2 = new Book[bs.length - 1];
for (int i = 0; i < bs.length; i++) {
if (bs[i].getBookName().equals(bookName)) {
for (int i1 = i; i1 < bs2.length; i1++) {
bs2[i] = bs[i + 1];
}
} else {
bs2[i] = bs[i];
}
}
return bs2;
}
/* @Override
public void setBookByName(String bookName,Book[] bs) {
for (int i=0;i< bs.length;i++){
if (bookName.equals(bs[i].getBookName())){
bs[i]=book;
}
}
}*/
@Override
public void setBookByName(String bookName, Book book, Book[] bs) {
for (int i = 0; i < bs.length; i++) {
if (bookName.equals(bs[i].getBookName())) {
bs[i] = book;
}
}
// @Override
// public void setBookByName(String bookName, Book[] bs) {
//
// }
/* @Override
public void login() {
System.out.println("欢迎使用图书管理系统，请先登录");
Scanner sc=new Scanner(System.in);
System.out.println("请输入用户名：");
String name=sc.nextLine();
if (name.equals(this.getUserName())){
System.out.println("请输入密码：");
String password=sc.nextLine();
if(password.equals(this.getPassword())){
System.out.println("登录成功");
System.out.println("请输入操作：1:添加图书");
insertBook();
}else{
System.out.println("用户名或密码有误");
}
}else{
System.out.println("请输入密码：");
String password1=sc.nextLine();
System.out.println("用户名或密码错误");
}
}
@Override
public void selectBook() {
System.out.println("请输入操作指令");
int num=sc.nextInt();
switch (num) {
case 1:
case 2:
case 3:
case 4:
case 5:
}
}*/
}
}
4：创建图书类存放图书的属性
package com.by.entity;
public class Book {
private String bookName;
private String bookAuthor;
private double bookPrice;
private int bookInventory;//库存
public Book(){}
public Book(String bookName,String bookAuthor,double bookPrice,int bookInventory){
this.bookName=bookName;
this.bookAuthor=bookAuthor;
this.bookPrice=bookPrice;
this.bookInventory=bookInventory;
}
public String getBookName(){
return bookName;
}
public void setBookName(String bookName){
this.bookName=bookName;
}
public String getBookAuthor() {
return bookAuthor;
}
public void setBookAuthor(String bookAuthor) {
this.bookAuthor = bookAuthor;
}
public double getBookPrice() {
return bookPrice;
}
public void setBookPrice(double bookPrice) {
this.bookPrice = bookPrice;
}
public int getBookInventory() {
return bookInventory;
}
public void setBookInventory(int bookInventory) {
this.bookInventory = bookInventory;
}
}
5：创建测试类测试
package com.by.test;
import com.by.entity.AdminUser;
import com.by.entity.NormalUser;
import com.by.entity.User;
import com.by.entity.Book;
import java.sql.SQLOutput;
import java.util.Scanner;
public class MainTest {
public static void main(String[] args) {
User[] users = {new AdminUser("张三", "123"), new NormalUser("李四", "321"),
new NormalUser("王五", "456"), new NormalUser("haha", "123")};
Book[] bs = {new Book("西游记", "吴承恩", 49.9, 999),
new Book("三国演义", "罗贯中", 48.9, 888),
new Book("水浒传", "施耐庵", 47.9, 777),
new Book("红楼梦", "曹雪芹", 46.9, 666)};
User user = login(users);
fonction(user, bs);
}
public static User login(User[] users) {
boolean result = false;
System.out.println("欢迎使用图书管理系统，请先登录");
Scanner sc = new Scanner(System.in);
System.out.println("请输入用户名：");
String name = sc.nextLine();
System.out.println("请输入密码：");
String password = sc.nextLine();
for (int i = 0; i < users.length; i++) {
if (name.equals(users[i].getUserName()) && password.equals(users[i].getPassword())) {
System.out.println("登录成功");
result = true;
return users[i];
}
}
System.out.println("用户名或密码错误，登录失败！");
return null;
}
public static void fonction(User user, Book[] bs) {
boolean a=true;
while(a) {
System.out.println("请选择你要进行的操作：1，查看所有图书信息 2。查看指定图书信息 " +
" 3，添加图书信息 4，修改图书信息 5，删除图书信息 6，退出");
Scanner scanner = new Scanner(System.in);
int sum = scanner.nextInt();
switch (sum) {
case 1:
user.selectBook(bs);
break;
case 2:
System.out.println("请输入图书名：");
String name = scanner.next();
user.selectBookByBookname(name, bs);
break;
case 3:
if (isAdmin(user)) {
AdminUser adminUser = (AdminUser) user;
System.out.println("请输入书名：");
String bookName = scanner.next();
System.out.println("作者");
String author = scanner.next();
System.out.println("请输入价格");
double price = scanner.nextDouble();
System.out.println("请输入库存");
int kucun = scanner.nextInt();
Book book = new Book(bookName, author, price, kucun);
Book[] bs1 = adminUser.insertBook(book, bs);
user.selectBook(bs1);
} else {
System.out.println("对不起，您太拉了，权限不够");
}
break;
case 4:
if (isAdmin(user)) {
System.out.println("请输入你要修改的图书");
String byname = scanner.next();
AdminUser adminUser = (AdminUser) user;
System.out.println("请输入改成的图书名");
String gaiName=scanner.next();
System.out.println("请输入作者");
String author=scanner.next();
System.out.println("请输入价格");
double price=scanner.nextDouble();
System.out.println("请输入库存");
int kucun=scanner.nextInt();
Book book=new Book(gaiName,author,price,kucun);
adminUser.setBookByName(byname, book,bs);
user.selectBook(bs);
} else {
System.out.println("对不起，您太拉了，权限不够");
}
break;
case 5:
if (isAdmin(user)) {
System.out.println("请输入要删除的图书");
String deleteName = scanner.next();
AdminUser adminUser = (AdminUser) user;
Book[] bs2=adminUser.deleteBooksByName(deleteName, bs);
user.selectBook(bs2);
break;
}
case 6:
System.out.println("欢饮下次使用！");
a=false;
break;
default:
System.out.println("输入有误，请重新输入");
break;
}
}
}
public static boolean isAdmin(User user) {
if (user instanceof AdminUser) {
return true;
} else {
return false;
}
}
}