一、系统的介绍
- 进入图书管理系统的用户分为:管理员用户和普通用户。
- 管理员用户所执行的操作有:查找图书、新增图书、删除图书、显示图书、退出系统。
- 普通用户所执行的操作有:查找图书、借阅图书、归还图书、退出系统。
二、各模块代码的实现
1、创建接口
各操作类都要实现该接口,以便后期组织各操作类的对象:
package operation;
import Book.BookList;
public interface IOperation {
void work(BookList bookList);
}
2、创建Book包
Book包里面存放book类及BookList类,相关代码如下:
2.1 book类代码
package Book;
public class book {
private String name;
private String author;
private int price;
private String type;
private boolean isBorrowed;
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)?", 已被借出":", 未被借出")
//", isBorrowed=" + isBorrowed+
+'}';
}
}
2.2 BookList类
BookList类是用来实现存放图书的功能的,相当于书架。在这里我设置的书架上最多能存放10本书( int DEFAULT_CAPACITY = 10;),并且书架上已存有三国演义、西游记、红楼梦三本书。
package Book;
public class BookList {
private book[] books;
private int usedSize; //记录当前书架上实际存放的书的数量
private static final int DEFAULT_CAPACITY = 10;
public BookList() {
this.books = new book[DEFAULT_CAPACITY];
this.books[0] = new book("三国演义","罗贯中",10,"小说");
this.books[1] = new book("西游记","吴承恩",9,"小说");
this.books[2] = new book("红楼梦","曹雪芹",19,"小说");
this.usedSize = 3;
}
public book getBook(int pos) {
return books[pos];
}
public void setBooks(int pos, book book) {
this.books[pos] = book;
}
public int getUsedSize() {
return usedSize;
}
public void setUsedSize(int usedSize) {
this.usedSize = usedSize;
}
public book[] getBooks() {
return books;
}
}
3、 创建operation包
operation包里面存放实现对图书进行操作的类,相关代码如下:
3.1 AddOperation类
该类实现新增图书的功能
package operation;
import Book.BookList;
import Book.book;
import java.util.Scanner;
public class AddOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("新增图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入书名:");
String name = scanner.nextLine();
System.out.println("请输入作者:");
String author = scanner.nextLine();
System.out.println("请输入类型:");
String type = scanner.nextLine();
System.out.println("请输入价格:");
int price = scanner.nextInt();
book book = new book(name,author,price,type);
//检查数组中有没有 这本书
int currentSize = bookList.getUsedSize();
for(int i = 0;i<currentSize;i++) {
book book1 = bookList.getBook(i);
if(book1.getName().equals(name)) {
System.out.println("已有这本书,不再进行存放了!");
return;
}
}
if(currentSize==bookList.getBooks().length) {
System.out.println("书架满了!");
}else {
bookList.setBooks(currentSize,book);
bookList.setUsedSize(currentSize+1);
}
}
}
3.2 DelOperation类
该类实现删除图书的功能
package operation;
import Book.BookList;
import Book.book;
import java.util.Scanner;
public class DelOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("删除图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要删除的图书:");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
int pos = -1;
int i = 0;
for (; i < currentSize; i++) {
book book = bookList.getBook(i);
if(book.getName().equals(name)) {
pos = i;
break;
}
}
if (i>=currentSize) {
System.out.println("没有你要删除的图书!");
return;
}
//删除图书
int j = pos;
for (;j<currentSize-1;j++) {
bookList.setBooks(j,bookList.getBook(j+1));
}
bookList.setBooks(j,null);
bookList.setUsedSize(currentSize-1);
}
}
3.3 ShowOperation类
该类实现显示图书的功能
package operation;
import Book.BookList;
import Book.book;
public class ShowOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("显示图书");
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
book book = bookList.getBook(i);
System.out.println(book);
}
}
}
3.4 BorrowOperation类
该类实现普通用户借阅图书的功能
package operation;
import Book.BookList;
import Book.book;
import java.util.Scanner;
public class BorrowOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("借阅图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要借阅的图书:");
String name = scanner.nextLine();
int currenSize = bookList.getUsedSize();
int i=0;
for (;i<currenSize;i++) {
book book = bookList.getBook(i);
if(book.getName().equals(name)) {
book.setBorrowed(true);
System.out.println("借阅成功!");
System.out.println(book);
return;
}
}
if (i == currenSize) {
System.out.println("没有你要借阅的图书!");
}
}
}
3.5 ReturnOperation类
该类实现普通用户归还图书的功能
package operation;
import Book.BookList;
import Book.book;
import java.util.Scanner;
public class ReturnOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("归还图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要归还的图书:");
String name = scanner.nextLine();
int currenSize = bookList.getUsedSize();
int i=0;
for (;i<currenSize;i++) {
book book = bookList.getBook(i);
if(book.getName().equals(name)) {
book.setBorrowed(false);
System.out.println("归还成功!");
System.out.println(book);
return;
}
}
System.out.println("你归还的图书不存在!");
}
}
3.6 FindOperation类
该类实现查找图书的功能
package operation;
import Book.BookList;
import Book.book;
import java.util.Scanner;
public class FindOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("查找图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要查找的图书:");
String name = scanner.nextLine();
int currenSize = bookList.getUsedSize();
int i = 0;
for (;i<currenSize;i++) {
book book = bookList.getBook(i);
if(book.getName().equals(name)) {
System.out.println("找到了,信息如下:");
System.out.println(book);
return;
}
}
if (i >= currenSize) {
System.out.println("你要找的书不存在!");
}
}
}
3.7 ExitOperation类
该类实现退出程序的功能
package operation;
import Book.BookList;
public class ExitOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("退出程序");
System.exit(0);
}
}
4、创建user包
user包里面装入User类、NomalUser类和AdminUser类, NomalUser类(普通用户)和AdminUser类(管理员用户)分别继承User类。
4.1 User类
package user;
import Book.BookList;
import operation.IOperation;
public abstract class User {
protected String name;
protected IOperation[] iOperation;
public User(String name) {
this.name = name;
}
public abstract int menu();
public void doOperation(int choice, BookList bookList) {
iOperation[choice].work(bookList);
}
}
4.2 NomalUser类
package user;
import operation.IOperation;
import operation.*;
import java.util.Scanner;
public class NomalUser extends User{
public NomalUser(String name) {
super(name);
this.iOperation = new IOperation[]{
new ExitOperation(),
new FindOperation(),
new BorrowOperation(),
new ReturnOperation()
};
}
public int menu() {
System.out.println("**********普通用户******");
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. 退出系统");
System.out.println("**********************");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你的操作:");
int choice = scanner.nextInt();
return choice;
}
}
4.3 AdminUser类
package user;
import operation.IOperation;
import operation.*;
import java.util.Scanner;
public class AdminUser extends User{
public AdminUser(String name) {
super(name);
this.iOperation = new IOperation[]{
new ExitOperation(),
new FindOperation(),
new AddOperation(),
new DelOperation(),
new ShowOperation(),
};
}
public int menu() {
System.out.println("**********管理员用户*****");
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. 退出系统");
System.out.println("**********************");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你的操作:");
int choice = scanner.nextInt();
return choice;
}
}
三、 主方法的实现
import Book.BookList;
import user.AdminUser;
import user.NomalUser;
import user.User;
import java.util.Scanner;
public class Main {
public static User login() {
System.out.println("请输入你的姓名:");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
System.out.println("请输入你的身份,1:管理员 2:普通用户->");
int choice = scanner.nextInt();
if(choice == 1){
return new AdminUser(name);
}else {
return new NomalUser(name);
}
}
public static void main(String[] args) {
BookList bookList = new BookList();
User user = login();
while (true) {
int choice = user.menu();
// System.out.println("choice:"+choice);
user.doOperation(choice,bookList);
}
}
}
这个图书管理系统的缺点:
- 没有做到持久化的存储(比如,管理员增加了一本图书后,在下一次运行的时候,增加的图书就不存在了
- 只是用到了数组