Java图书管理
菜菜不恰菜 人气:0前言
今天的内容主要是利用前面所学的知识点：类，抽象类，封装，继承，多态，接口等进行的一个简单的代码练习。
主要要求：
1、用户登录
2、管理端
- 查找图书
- 新增图书
- 删减图书
- 显示图书列表
- 退出系统
3、用户端
- 查找图书
- 借阅图书
- 归还图书
- 退出系统
我们可以将以上内容分为对书的创建初始化，对用户的操作，对书的操作。
主函数
Main：（对所有流程进行整合）
import book.BookList;
import User.NormalUser;
import User.AdminUser;
import User.user;
import java.util.Scanner;
public class Main {
public static user login(){
System.out.print("请输入你的姓名:");
Scanner scanner=new Scanner(System.in);
String name=scanner.nextLine();
System.out.println("请选择你的身份：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 us = login();//向上转型
while (true) {
int choice = us.menu();//多态绑定
us.doWork(choice, bookList);
}
}
}书的创建
Book:
package book;
//创建图书
public class Book {
private String name;//书名
private String author;//书的作者
private String type;//书的类型
private int price;//书的价格
boolean isBorrowed;//书是否被借出
//在这里我们就不对isBorrowed进行构造，在最后打印的时候对他进行判断就好
public Book(String name, String author, String type, int price) {
this.name = name;
this.author = author;
this.type = type;
this.price = price;
}
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 String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public boolean isBorrowed() {
return isBorrowed;
}
public void setBorrowed(boolean borrowed) {
isBorrowed = borrowed;
}
@Override
public String toString() {
return "Book{" +
"name='" + name + '\'' +
", author='" + author + '\'' +
", type='" + type + '\'' +
", price=" + price +
((isBorrowed==true)?" 已被借出":" 未被借出") +
'}';
}
}BookList:
package book;
//创建书架
public class BookList {
private Book[] books=new Book[10];//创建一个数组当书架放书，假设一共可以放10本
public int usedSize;//书架上有效放书数
public BookList(){//假设一开始书架上就放了三本书
books[0]=new Book("红楼梦","曹雪芹","文学",55);
books[1]=new Book("西游记","吴承恩","文学",65);
books[2]=new Book("水浒传","施耐庵","文学",23);
usedSize=3;
}
public int getUsedSize(){
return usedSize;
}
public void setUsedSize(int usedSize){
this.usedSize=usedSize;
}
//获取一本书的位置
public Book getpos(int pos){
return this.books[pos];
}
//在下标为pos的位置上放一本书（添加）
public void setBook(int pos,Book book){
this.books[pos]=book;
}
}对用户的操作
创建用户user类：
package User;
import book.BookList;
import operation.IOperation;
public abstract class user {
protected String name;
protected IOperation[] iOperations;//创建操作类数组，通过返回的数字用于对书的操作
public user(String name){
this.name=name;
}
public abstract int menu();//用于动态绑定
public void doWork(int choice, BookList bookList){
iOperations[choice].work(bookList);
}
}创建管理员用户类AdminUser ，是 user 的子类.
package User;
import operation.*;
import java.util.Scanner;
public class AdminUser extends user {
public AdminUser(String name) {
super(name);
this.iOperations=new IOperation[]{//初始化数组，将菜单上的数字与对应的操作放好
new ExitOperation(),
new FindOperation(),
new AddOperation(),
new DelOperation(),
new DisplayOperation()
};
}
public int menu(){
System.out.println("========管理员的菜单========");
System.out.println("欢迎"+this.name+"来到图书馆");
System.out.println("1.查找图书");
System.out.println("2.新增图书");
System.out.println("3.删减图书");
System.out.println("4.显示图书");
System.out.println("0.查退出系统");
System.out.println("===========================");
System.out.print("请选择你要的操作： ");
Scanner scanner=new Scanner(System.in);
int choice=scanner.nextInt();
return choice;//返回选择的数字
}
}创建普通用户类NormalUser, 是 user 的子类.
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("欢迎"+this.name+"来到图书馆");
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("============================");
System.out.print("请选择你要的操作： ");
Scanner scanner=new Scanner(System.in);
int choice=scanner.nextInt();
return choice;
}
}对书的操作
创建接口 IOperation：
package operation;
import book.BookList;
import java.util.Scanner;
public interface IOperation {
Scanner scanner=new Scanner(System.in);
void work(BookList bookList);
}创建增加图书类AddOperation，继承接口 IOperation
package operation;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class AddOperation implements IOperation{
public void work(BookList bookList){
System.out.println("新增图书！");
System.out.println("请输入图书的名字:");
String name = scanner.nextLine();
System.out.println("请输入图书的作者:");
String author = scanner.nextLine();
System.out.println("请输入图书的类型:");
String type = scanner.nextLine();
System.out.println("请输入图书的价格:");
int price = scanner.nextInt();
Book book=new Book(name,author,type,price);//新创建一本书
int size= bookList.getUsedSize();
bookList.setBook(size,book);
bookList.setUsedSize(size+1);
System.out.println("新增图书成功");
}
}创建删减图书类DelOperation，继承接口 IOperation
package operation;
import book.Book;
import book.BookList;
public class DelOperation implements IOperation{
public void work(BookList bookList){
System.out.println("删减图书");
System.out.println("请输入要删减图书的名字：");
String name=scanner.nextLine();
int size= bookList.getUsedSize();
int index=0;
int i=0;
for (i = 0; i <size ; i++) {
Book book = bookList.getpos(i);
if(name.equals(book.getName())) {
index=i;
break;
}
}
if(i>=size){
System.out.println("没有你要删除的图书");
}
//删除就是要将j+1下标的信息放进j下标里面信息去，这样子j里面的信息就被删除了
for (int j = index; j < size-1; j++) {
Book book=bookList.getpos(j+1);//获取j+1下标放的书的信息给j下标
bookList.setBook(j,book);
}
bookList.setBook(size,null);//删除之后，把最后一个下标信息置为null
bookList.setUsedSize(size-1);//下标减1
System.out.println("删除成功");
}
}创建查找图书类FindOperation，继承接口 IOperation
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！");
System.out.println("请输入要查找书的名字");
String name = scanner.nextLine();
int size = bookList.getUsedSize();
for (int i = 0; i < size; i++) {
Book book = bookList.getpos(i);//找到这本书的信息
if(name.equals(book.getName())) {//比较名字是否相同
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！");
}
}创建显示图书列表类DisplayOperation，继承接口 IOperation
package operation;
import book.Book;
import book.BookList;
public class DisplayOperation implements IOperation{
public void work(BookList bookList){
System.out.println("显示图书");
for(int i=0;i<bookList.usedSize;i++){
Book book=bookList.getpos(i);
System.out.println(book);
}
}
}创建借阅图书列表类BorrowOperation，继承接口 IOperation
package operation;
import book.Book;
import book.BookList;
public class BorrowOperation implements IOperation{
public void work(BookList bookList){
System.out.println("借阅图书");
System.out.println("请输入你要借阅的图书的名字");
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("没有你要借阅的书");
}
}创建归还图书列表类ReturnOperation，继承接口 IOperation
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("归还成功");
System.out.println(book);
return;
}
}
System.out.println("没有你要归还的书");
}
}创建退出系统类ExitOperation，继承接口 IOperation
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);
}
}加载全部内容