一、功能介绍
二、Main包
三、User包
1. User
2. AdminUser
3. NormalUser
四、book包
1. Book
2. BookList
五、operations包
1. IOperation接口
2. AddOperation
3. BorrowOperation
4. DelOperation
5. DisplayOperation
6. ExitOperation
7. FindOperation
8. ReturnOperation
一、功能介绍此图书管理系统借助IDEA开发工具实现
图书馆系统一共有两种身份的访问：
1.管理员身份:
2.普通用户身份:
我们一共有三个包分别是book,operations,user实现.
main函数主要进行大致流程的进行，图书库的初始化，图书管理系统的登录，以及具体操作的选择，即实施.
import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
//1.先初始化图书库，以及初始化:
BookList bookList = new BookList();
//2.登录
User user = login();//向上转型，User接受管理员或者用户对象
//3.打印菜单,进行具体操作
while(true) {
int choice = user.menu();
user.doOperation(choice,bookList);
}
}
}
登录功能：
public static User login() {
System.out.println("请输入你的姓名: ");
Scanner scanner = new Scanner(System.in);
String userName = scanner.nextLine();
System.out.println("请输入你的身份: 1-> 管理员 2-> 用户");
int choice = scanner.nextInt();
if(choice == 1) {
return new AdminUser(userName);
}else {
return new NormalUser(userName);
}
}
三、User包
因为有两套系统，管理员和普通用户，所以我们将共同属性提取出来一个User抽象类，以达到代码复用
1. Userpackage user;
import book.BookList;
import operations.IOperation;
public abstract class User {
protected String name;
IOperation[] iOperations;
public User(String name) {
this.name = name;
}
public abstract int menu();
public void doOperation(int choice, BookList bookList) {
iOperations[choice].work(bookList);
}
}
2. AdminUser
package user;
import operations.*;
import java.util.Scanner;
public class AdminUser extends User{
public AdminUser(String name) {
super(name);
this.iOperations = new IOperation[]{
new ExitOperation(),
new FindOperation(),
new AddOperation(),
new DelOperation(),
new DisplayOperation()
};
}
public int menu() {
System.out.println("欢迎: "+name+"来到图书馆");
System.out.println("**********************************");
System.out.println("1. 查找图书");
System.out.println("2. 新增图书");
System.out.println("3. 删除图书");
System.out.println("4. 显示图书");
System.out.println("0. 退出图书");
System.out.println("**********************************");
System.out.println("请输入你的操作: ");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
return choice;
}
}
3. NormalUser
package user;
import operations.*;
import java.util.Scanner;
public class NormalUser extends User{
public NormalUser(String name) {
super(name);
this.iOperations = new IOperation[]{
new ExitOperation(),
new FindOperation(),
new BorrowOperation(),
new ReturnOperation()
};
}
public int menu() {
System.out.println("欢迎: "+name+"来到图书馆");
System.out.println("**********************************");
System.out.println("1. 查找图书");
System.out.println("2. 借阅图书");
System.out.println("3. 归还图书");
System.out.println("0. 退出图书");
System.out.println("**********************************");
System.out.println("请输入你的操作: ");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
return choice;
}
}
四、book包
我们对book的属性进行书写，以及在BookList种对图书库的书进行初始化.
1. Bookpackage book;
public class Book {
private String name;//书名
private String author;//作者
private int price;//价格
private String type;//书的类型
private boolean isBorrowed;//书默认未借出
public Book(String name, String author, int price, String type) {
this.name = name;
this.author = author;
this.price = price;
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public boolean isBorrowed() {
return isBorrowed;
}
public void setBorrowed(boolean borrowed) {
isBorrowed = borrowed;
}
@Override
public String toString() {
return "Book{" +
"name='" + name + '\'' +
", author='" + author + '\'' +
", price=" + price +
", type='" + type + '\'' +
","+ ((isBorrowed == true) ? "该书已借出" : "该书未借出" )+
'}';
}
}
2. BookList
package book;
public class BookList {
public Book[] books = new Book[100];
public int usedSize;//用来存当前共有多少本书
/**
* 事先通过代码块
*
* 事先存进去三本书
*/
{
books[0] = new Book("java","高斯林",95,"IT");
books[1] = new Book("C++","姚琳",93,"IT");
books[2] = new Book("python","马瑟斯",80,"IT");
this.usedSize = 3;
}
public Book getPos(int pos) {
//获取某一位置的书
return books[pos];
}
public void setBooks(Book book,int pos) {
//存储一本书 到指定位置
books[pos] = book;
}
public int getUsedSize() {
return usedSize;
}
public void setUsedSize(int usedSize) {
this.usedSize = usedSize;
}
}
五、operations包
我们的图书管理系统有很多具体的操作，为了后面方便多态，以及检验错误，所以我们实现一个具体的IOperation接口，每一个具体的操作去实现这个接口.
1. IOperation接口package operations;
import book.BookList;
public interface IOperation {
void work(BookList bookList);
}
2. AddOperation
增加图书：
package operations;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class AddOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("新增图书! ");
System.out.println("请输入要新增的图书的名字: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
System.out.println("请输入要新增的图书的作者: ");
String author = scanner.nextLine();
System.out.println("请输入要新增的图书的价格: ");
int price = scanner.nextInt();
System.out.println("请输入要新增的图书的类型: ");
String type = scanner.nextLine();
Book book = new Book(name,author,price,type);
//1.获取当前书存放的位置
int curSize = bookList.getUsedSize();
//2.把书放在指定位置
bookList.setBooks(book,curSize);
//3.更新书的个数
bookList.setUsedSize(curSize+1);
}
}
3. BorrowOperation
借阅图书:
package operations;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class BorrowOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("借阅图书! ");
System.out.println("请输入要借阅的图书的名字: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getPos(i);
if(name.equals(book.getName())) {
if(book.isBorrowed()) {
System.out.println("该书已经被借出! ");
}else {
book.setBorrowed(true);
System.out.println("借阅图书成功! ");
return;
}
}
}
System.out.println("没有你要借阅的书! ");
}
}
4. DelOperation
删除图书:
package operations;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class DelOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("删除图书! ");
System.out.println("请输入要删除的图书: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
//查找图书是否有此图书，记录下标
int index = -1;
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getPos(i);
if(name.equals(book.getName())) {
index = i;
break;
}
}
if(index == -1) {
System.out.println("没有 "+name+"这本书!");
return;
}
for (int i = index; i < bookList.getUsedSize()-1; i++) {
Book book = bookList.getPos(i+1);
bookList.setBooks(book,i);
}
//删除的书,要置空
bookList.setBooks(null, bookList.getUsedSize()-1);
bookList.setUsedSize(bookList.getUsedSize()-1);
}
}
5. DisplayOperation
显示图书:
package operations;
import book.Book;
import book.BookList;
public class DisplayOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("显示图书! ");
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getPos(i);
System.out.println(book);
}
}
}
6. ExitOperation
退出图书：
package operations;
import book.BookList;
public class ExitOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("退出系统! ");
System.exit(0);
}
}
7. FindOperation
查找图书:
package operations;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class FindOperation implements IOperation{
@Override
public void work(BookList bookList) {
//查找图书
System.out.println("查找图书! ");
System.out.println("请输入要查找的图书: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getPos(i);
if(name.equals(book.getName())) {
System.out.println("找到了! ");
System.out.println(book);
return;
}
}
System.out.println("没有这本书! ");
}
}
8. ReturnOperation
归还图书:
package operations;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class ReturnOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("归还图书! ");
System.out.println("请输入要归还的图书的名字: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getPos(i);
if(name.equals(book.getName())) {
book.setBorrowed(false);
System.out.println("归还图书成功! ");
return;
}
}
System.out.println("没有你要归还的书! ");
}
}
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