JavaSE图书管理系统
思路
实际上大概分为三步 ,关于书相关的放在book 包里,关于用户相关的放在User 包里,关于操作相关的我们放在Operation 包里,不同的包用来管理不同的代码,那么为什么要把操作放在一个包里呢?原因是我们分为普通用户 和管理员 用户,那么普通用户和管理员用户的操作是不一样的,我们放在一个类里面,不太好区分。
关于book包，operation包，user包里面的类和接口。
关于book包里，定义两个类，bookList为书架的类，book关于书的类。
关于operation包里的类都是对bookList的操作，如查找，删除等。
关于User的类，大致为管理员类和普通用户类，和普通的User类。
一.Main方法
java
import book.BookList;
import user.AdminUser;
import user.NormaUser;
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){
//管理员
return new AdminUser(name);
}else{
//普通用户
return new NormaUser(name);
}
}
public static void main(String[] args) {
BookList booklist = new BookList();//书架创建
//user 指向哪个对象 就看返回值是哪个
User user = login();
//登录
while(true) {//重复执行操作
int choice = user.menu();
//看user指向哪个对象,就调用哪个菜单
System.out.println("choice: " + choice);
//根据choice 的选择,来决定调用的是哪个方法?
user.doOperation(choice, booklist);
}
}
}二.User包
1.User类
java
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 doOperation(int choice, BookList bookList){
ioPerations[choice].work(bookList);//拿到对象,调用对象的方法
}
}2.NormaUser类
java
package user;
import operation.*;
import java.util.Scanner;
public class NormaUser extends User {//普通用户
public NormaUser(String name) {
super(name);
this.ioPerations = new IOPeration[]{
new ExitOperation(),
new FindOperation(),
new BorrowOperation(),
new ReturnOperation(),
};//初始化数组
}
public int menu(){ //菜单
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 sc = new Scanner(System.in);
System.out.println("请输入你的操作: ");
int choice = sc.nextInt();
return choice;
}
}3.AdminUser类
java
package user;
import operation.*;
import java.util.Scanner;
public class AdminUser extends User {//管理员用户
public AdminUser(String name) {
super(name);
this.ioPerations = new IOPeration[]{
new ExitOperation(),
new FindOperation(),
new AddOperation(),
new DelOperation(),
new ShowOperation(),
};
}
public int menu(){ //菜单
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 sc = new Scanner(System.in);
System.out.println("请输入你的操作: ");
int choice = sc.nextInt();
return choice;
}
}三.book包
1.BookList类
java
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
public BookList(){
this.books = new Book[10];
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 int getUsedSize() {
return usedSize;
}
public void setUsedSize(int usedSize) {
this.usedSize = usedSize;
}
public Book getBook(int pos){
return books[pos];
}
public void setBooks(int pos,Book book){
books[pos] = book;
}
public Book[] getBooks(){
return books;
}
}2.Book类
java
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) ? ",已经借出" : ",未被借出")+
'}';
}
}四.operation包
因为所以操作都是对于书架的，所以我们设置一个接口
1.IOPeration接口
java
package operation;
import book.BookList;
public interface IOPeration {
void work(BookList bookList);
}2.AddOperation类
新增图书
java
package operation;
import book.Book;
import book.BookList;
import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
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);
//检查数组当中有没有这本书
int currentSize = bookList.getUsedSize();
for(int i = 0;i<currentSize;i++){
Book book1 = bookList.getBook(i);
if(book1.getName().equals(name)){
System.out.println("有这本书,不进行存放了!");
return;
}
}
//判断数组是否满了
if(currentSize==bookList.getBooks().length){
System.out.println("书架满了!");
}else{
bookList.setBooks(currentSize,book);
bookList.setUsedSize(currentSize+1);
}
}
}3.BorrowOperation类
借阅图书
java
package operation;
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!");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要借阅的图书:");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
for(int i = 0;i<currentSize;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;
}
}
System.out.println("你借阅的图书不存在!!!");
}
}4.DelOperation类
删除图书
java
package operation;
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!");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要删除的图书:");
String name = scanner.nextLine();
int pos = -1;
int currenSize = bookList.getUsedSize();
int i = 0;
for(;i<currenSize;i++){
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
pos = i;
break;
}
}
if(i==currenSize){
System.out.println("没有你要删除的图书!");
return;
}
//开始删除
int j = pos;
for(;j<currenSize-1;j++){
Book book = bookList.getBook(j+1);
bookList.setBooks(j,book);
}
bookList.setBooks(j,null);
bookList.setUsedSize(currenSize-1);
}
}5.FindOperation类
查找图书
java
package operation;
import book.Book;
import book.BookList;
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);
String name = scanner.nextLine();
//遍历这个数组
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
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!");
}
}6.ReturnOperation类
归还图书
java
package operation;
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!");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要归还的图书:");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
for(int i = 0;i<currentSize;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!!!");
}
}7.ShowOperation类
打印图书
java
package operation;
import book.Book;
import book.BookList;
public class ShowOperation implements IOPeration {
@Override
public void work(BookList bookList) {
System.out.println("打印图书!");
int currentSize = bookList.getUsedSize();//现在有多少本书
for(int i = 0;i<currentSize;i++){
Book book = bookList.getBook(i);
System.out.println(book);
}
}
}8.ExitOperation类
退出系统
java
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);
}
}