文章目录
- 简单的图书管理系统
- 二、各个类的实现
- 1.book类
- (1)Book
- (2)BookList
- 2.operation类
- (1)IOperation
- (2)AddOperation
- (3)BorrowOperation
- (4)DelOperation
- (5)DisplayOperation
- (6)ExitOperation
- (7)FindOperation
- (8)ReturnOperation
- 3.user类
- (1)AdminUser
- (2)NormalUser
- (3)User
- main函数
- 总结
简单的图书管理系统
二、各个类的实现
1.book类
(1)Book
package book;
public class Book {
private String name;//书名
private String author;//作者
private int price;//价格
private String type;//类型
private boolean isBorrowed;//是否借出
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) ? " 已经被借出 " : " 未被借出 ") +
'}';
}
}
(2)BookList
package book;
public class BookList {
private Book[] books = new Book[10];
private int usedSize;
public BookList() {
books[0] = new Book("三国演义","罗贯中",17,"小说");
books[1] = new Book("西游记","吴承恩",47,"小说");
books[2] = new Book("水浒传","施耐庵",37,"小说");
this.usedSize = 3;
}
public int getUsedSize() {
return usedSize;
}
public void setUsedSize(int usedSize) {
this.usedSize = usedSize;
}
//获取到pos位置的一本书
public Book getPos(int pos) {
return this.books[pos];
}
//设置Pos下标为一本书->[添加一本书]
public void setBook(int pos,Book book) {
this.books[pos] = book;
}
}
2.operation类
(1)IOperation
因为Operation包中各个操作都需要用到book,所以创建一个接口IOperation,以便提高程序运行的效率.
package operation;
import book.BookList;
import java.util.Scanner;
public interface IOperation {
Scanner scanner=new Scanner(System.in);
void work(BookList bookList);
}
(2)AddOperation
package operation;
import book.Book;
import book.BookList;
public class AddOperation implements IOperation{
public void work(BookList bookList){
System.out.println("新增图书!");
System.out.println("新增图书的名字:");
String name =scanner.nextLine();
System.out.println("请输入图书的作者:");
String author = scanner.nextLine();
System.out.println("请输入图书的价格:");
int price = scanner.nextInt();
System.out.println("请输入图书的类型:");
String type = scanner.nextLine();
Book book =new Book(name,author,price,type);
int size=bookList.getUsedSize();
bookList.setBook(size,book);
bookList.setUsedSize(size+1);
System.out.println("新增图书成功!");
}
}
(3)BorrowOperation
package operation;
import book.BookList;
import book.Book;
public class BorrowOperation implements IOperation{
public void work(BookList bookList){
System.out.println("借阅图书!");
System.out.println("请输入你想借阅图书的名字:");
String name = scanner.nextLine();
int size=bookList.getUsedSize();
for (int i=0;i<size;i++){
Book book=bookList.getPos(i);
if(name.equals(book.getName())){
book.setBorrowed(true);
System.out.println("借阅成功!");
System.out.println(book);
return;
}
}
System.out.println("不存在你需要借阅的书籍!");
}
}
(4)DelOperation
package operation;
import book.Book;
import book.BookList;
public class DelOperation implements IOperation{
public void work(BookList bookList){
System.out.println("删除图书!");
//1.根据书名找到书的位置 index
System.out.println("请输入你要删除的书的名字:");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
int index = 0;//存储找到的下标
int i=0;
for (;i<currentSize;i++){
Book book=bookList.getPos(i);
if(book.getName().equals(name)){
index=i;
break;
}
}
if (i>=currentSize){
System.out.println("没有你要删除的这本书!");
return;
}
//2.进行删除
for (int j=0;j<currentSize-1;j++){
Book book=bookList.getPos(j+1);
bookList.setBook(j,book);
}
bookList.setBook(currentSize,null);
bookList.setUsedSize(currentSize-1);
System.out.println("删除成功!");
}
}
(5)DisplayOperation
package operation;
import book.BookList;
import book.Book;
public class DisplayOperation implements IOperation {
public void work(BookList bookList){
System.out.println("打印图书!");
int size=bookList.getUsedSize();
for (int i=0;i<size;i++){
Book book=bookList.getPos(i);
System.out.println(book);
}
}
}
(6)ExitOperation
package operation;
import book.BookList;
public class ExitOperation implements IOperation {
public void work(BookList bookList){
System.out.println("退出系统!");
System.exit(0);
}
}
(7)FindOperation
package operation;
import book.BookList;
import book.Book;
public class FindOperation implements IOperation{
public void work(BookList bookList) {
System.out.println("查找图书:");
String name=scanner.nextLine();
int size=bookList.getUsedSize();
for (int i=0;i<size;i++){
Book book=bookList.getPos(i);
if(name.equals(book.getName())){
System.out.println("找到了这本书,信息如下:");
System.out.println(book);
return;
}
}
System.out.println("没有找到这本书!");
}
}
(8)ReturnOperation
package operation;
import book.Book;
import book.BookList;
public class ReturnOperation implements IOperation{
public void work(BookList bookList){
System.out.println("归还图书");
System.out.println("请输入你要归还的书的名字:");
String name=scanner.nextLine();
int size=bookList.getUsedSize();
for (int i=0;i<size;i++){
Book book=bookList.getPos(i);
if (name.equals(book.getName())){
book.setBorrowed(false);
System.out.println("归还成功!");
System.out.println(book);
return;
}
}
System.out.println("没有你要归还的书!");
}
}
3.user类
(1)AdminUser
package user;
import book.BookList;
import operation.*;
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("===========管理员菜单===========");
System.out.println("hello " + this.name +" 欢迎来到这里!");
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);
int choice = scanner.nextInt();
return choice;
}
}
(2)NormalUser
package user;
import operation.*;
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("===========普通用户的菜单===========");
System.out.println("hello " + this.name +" 欢迎来到这里!");
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);
int choice = scanner.nextInt();
return choice;
}
}
(3)User
package user;
import book.BookList;
import operation.IOperation;
public abstract class User {
protected String name;
protected IOperation[] iOperations;
public User(String name) {
this.name = name;
}
public abstract int menu();
public void dowork(int choice, BookList bookList) {
iOperations[choice].work(bookList);
}
}
main函数
import book.BookList;
import user.AdminUser;
import user.NormalUser;
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,0->普通用户");
int choice=scanner.nextInt();
if (choice==1){
return new AdminUser(name);
}else {
return new NormalUser(name);
}
}
public static void main(String[] args) {
BookList bookList=new BookList();
User user=login();//向上转型
while (true){
int choice=user.menu();//发生了动态绑定->多态
//根据你的choice调用合适的操作
user.dowork(choice,bookList);
}
}
}
总结
提示:以上是一个简单的图书管理系统代码实现,后续还将有更多的功能添加其中。