图书管理系统

图书管理系统

简单的示意图:

分析:

各个类的实现

1.Book类

2.BookList类

3.因为Operation包中各个操作都需要用到book,所以创建一个接口IOperation

4.User类

5.Admin类

6.Normal类

7.Main类

8.实现DisplayOperation

9.实现FindOperation

10.实现AddOperation

11.实现BorrowOperation

12.实现ReturnOperation

13.实现DelOperation

14.ExitOperation
1.

package book;

public class Book {
private String name ;//书的书名
private String author;//书的作者
private int price;//书的价格
private String type;//书的类型
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)?"被借出":"未被借出")+
'}';
}
}

2.

package book;

public class BookList {
private Book[] books = new Book[100];//用顺序表的方式存书
private int usedSize;

public BookList(){
//给3本书在图书管理系统里
books[0] = new Book("Java SE","博哥",2000,"专业知识");
books[1] = new Book("Java EE","大博哥",3000,"专业知识");
books[2] = new Book("数据结构","博哥哥",4000,"理论知识");

usedSize=3;
}

public Book getBook(int pos) {
return this.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;
}
}

3.

package Operation;

import book.BookList;

import java.util.Scanner;

public interface IOperation {
public void work(BookList bookList);

Scanner sc = new Scanner(System.in);
}

4.

package user;

import Operation.IOperation;
import book.BookList;

abstract public class User {
protected String name ;//用户名

protected IOperation[] iOperations;//对书的操作

public User(String name){
this.name = name;
}

abstract public int menu();

public void doOperation(int choice, BookList bookList) {
this.iOperations[choice].work(bookList);
}
}

5.

package user;

import Operation.*;
import book.BookList;

import java.util.Scanner;

public class Admin extends User {
public Admin(String name) {
super(name);
this.iOperations = new IOperation[]{
new ExitOperation(),//下标为0
new FindOperation(),//下标为1
new AddOperation(),//下标为2
new DelOperation(),//下标为3
new DisplayOperation()//下标为4
};
}

@Override
public int menu() {
System.out.println("======================================");
System.out.println("hello "+this.name+" 欢迎来到图书馆里系统");
System.out.println("1.查阅图书");
System.out.println("2.添加图书");
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 sc = new Scanner(System.in);
int choice = sc.nextInt();
return choice;
}

}

6.

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(),//下标为0
new FindOperation(),//下标为1
new BorrowOperation(),//下标为2
new ReturnOperation()//下标为3
};
}

@Override
public int menu() {
System.out.println("======================================");
System.out.println("hello "+this.name+" 欢迎来到图书馆里系统");
System.out.println("1.查阅图书");
System.out.println("2.借出图书");
System.out.println("3.归还图书");
System.out.println("0.退出系统");
System.out.println("======================================");

Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
return choice;
}
}

7.

import book.BookList;
import user.Admin;
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 sc = new Scanner(System.in);
String name = sc.nextLine();
System.out.println("请选择你的身份: 1. 管理员 2. 普通用户");
int choice = sc.nextInt();
if(choice==1){
return new Admin(name);
}else{
return new NormalUser(name);
}
}
public static void main(String[] args) {
BookList bookList = new BookList();


User user = login();//返回的是子类对象,父类引用 引用 子类对象 发生向上转型
while(true) {
int choice = user.menu();//父类引用调用了同名的覆盖方法 此时发生动态绑定
user.doOperation(choice,bookList);
}
}
}

8.

package Operation;

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.getBook(i);
System.out.println(book);
}
}
}

9.

package Operation;

import book.Book;
import book.BookList;

public class FindOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("查找图书");
System.out.println("请输入你要查找的图书的书名:");
String name = sc.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
System.out.println("找到了这本书!");
System.out.println(book);
//找到了这本书直接return
return;
}
}
//循环结束 没有找到书
System.out.println("没有这本书!");
}
}

10.

package Operation;

import book.Book;
import book.BookList;

public class AddOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("添加图书! ");
System.out.println("请输入你要添加图书的书名:");
String name = sc.next();
System.out.println("请输入你要添加图书的作者:");
String author = sc.next();
System.out.println("请输入你要添加图书的价格:");
int price = sc.nextInt();
System.out.println("请输入你要添加图书的类型:");
String type = sc.next();

Book book = new Book(name,author,price,type);
bookList.setBooks(bookList.getUsedSize(), book);
bookList.setUsedSize(bookList.getUsedSize()+1);//usedSize要加1
System.out.println("添加成功! ");

}
}

11.

package Operation;

import book.Book;
import book.BookList;

public class BorrowOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("借出图书");
System.out.println("请输入你要借的书名:");
String name = sc.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
book.setBorrowed(true);
System.out.println("借书成功");
return;
}
}
System.out.println("没有你要借的书!");
}
}

12.

package Operation;

import book.Book;
import book.BookList;

public class ReturnOperation implements IOperation{
@Override
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:");
String name = sc.nextLine();
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
book.setBorrowed(true);
System.out.println("归还成功!");
return;
}
}
System.out.println("没有你要归还的书籍");
}
}

13.

package Operation;

import book.Book;
import book.BookList;

public class DelOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("删除图书");
System.out.println("请输入你要删除的图书的书名:");
String name = sc.nextLine();
int pos = -1;
for (int i = 0; i < bookList.getUsedSize(); i++) {
Book book = bookList.getBook(i);
if (book.getName().equals(name)){
pos = i;
break;//有相同的书就返回i的下标
}
}
if(pos == -1){
//当pos没有改变时,直接返回
System.out.println("没有你要删除的书籍");
return;
}
//将pos位置删除,从后往前交换
for (int i = pos; i < bookList.getUsedSize(); i++) {
Book book = bookList.getBook(i+1);
bookList.setBooks(i,book);
}
bookList.setUsedSize(bookList.getUsedSize()-1);//usedSize要-1
System.out.println("删除成功!");
}
}

14.

package Operation;

import book.BookList;

public class ExitOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("退出系统");
System.exit(0);
}
}