《1.图书馆里系统》

book包

book书类

package book;

public class Book {
    
    private String name;//书的姓名
    private String author;//书的作者
    private int price;//书的价格
    private String type;//书的类型
    private boolean isBorrowed;//书的状态是否被借出

    public Book() {
    
    }

    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 getBorrowed() {
    
        return isBorrowed;
    }

    public void setBorrowed(Boolean borrowed) {
    
        isBorrowed = borrowed;
    }

    @Override
    public String toString() {
    
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ", isBorrowed=" +
                ((isBorrowed==true)?"已经借出":"未借出")+
                '}';
    }

  
}

bookList书架类

package book;

public class BookList {
    
   private Book[] books=new Book[10];
    private int anny;//记录书的多少
    public BookList(){
    
        books[0]=new Book("三国演义","罗贯中",55,"名著");
        books[1]=new Book("红楼梦","草学期",55,"名著");
        books[2]=new Book("比特","王新",55444,"名著");
        anny=3;
    }

    /** * 访问书架的书 * @param pos * @return */
    public Book getBook(int pos){
    
        return books[pos];
}
/** *添加书架的书 * */
public void setBooks(int pos,Book book){
    
    books[pos]=book;
}

    /** * 获取书架书的个数 */
    public int getAnny(){
    
    return anny;
}
/** * 修改书架书的个数 */
public void setAnny(int pos){
    
    this.anny=pos;
}
}

operation包（操作）

​ 1.先创建一个操作的接口

IOperation（操作接口）

package operation;

import book.BookList;

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

AddOperation(增加图书)

package operation;

import book.Book;
import book.BookList;

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,price,type);
        int add=bookList.getAnny();
        bookList.setBooks(add,book);
        bookList.setAnny(add+1);
        System.out.println("新增成功！！");
        return;
    }
}

BorrowOperation（查阅图书）

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("请输入图书的名字：");
        String name=scanner.nextLine();

        int currentSize=bookList.getAnny();
        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！！");
                return;
            }
        }

    }
}

DelOperation（删除图书）

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");
        System.out.println("请输入要删除的图书:");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        for (int i = 0; i < bookList.getAnny(); i++) {
    
            Book book=bookList.getBook(i);
            if (book.getName().equals(name)){
    
                if (i==bookList.getAnny()){
    //如果删除的图书为最后一个则删除
                    bookList.setAnny(bookList.getAnny()-1);
                    return;

                }

                int j=0;
                for (j = i; j < bookList.getAnny()-1; j++) {
    //如果删除的不是最后一个
                bookList.setBooks(j,bookList.getBook(j+1));

                }
                if (j==bookList.getAnny()-1){
    
                    System.out.println("删除成功");
                    bookList.setAnny(bookList.getAnny()-1);

                    return;
                }
            }
        }
        System.out.println("删除失败");
        return;
    }
}

DisplayOperation（显示图书）

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.getAnny(); i++) {
    
            System.out.println(bookList.getBook(i));


        }

    }
}

ExitOperation（退出系统）

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);
    }
}

FindOperation(查找图书)

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！！");
        System.out.println("请输入书的名字");
        Scanner scanner=new Scanner(System.in);

        String name=scanner.nextLine();
        for (int i = 0; i <bookList.getAnny(); i++) {
    
            Book book =bookList.getBook(i);
            if(book.getName().equals(name)){
    
                System.out.println("找到了！！");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有此书！！");
    }
}

ReturnOperation(归还图书)

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("请输入图书的名字：");
        String name=scanner.nextLine();

        int currentSize=bookList.getAnny();
        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！！");
                return;
            }
        }
    }
}

User用户包

User(用户)

package user;

import book.BookList;
import operation.IOperation;

public abstract class User {
    
    protected String name;

    IOperation[] iOperations;
    public User(String name) {
    
        this.name = name;
    }
    abstract public int menu();
    public void abOperation(int choice, BookList bookList){
    
        this.iOperations[choice].work(bookList);
    }

}

AdminUser(管理员用户)

package user;

import operation.*;
import operation.IOperation;

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()
        };
    }

    @Override
    public int menu() {
    
        System.out.println("您好"+this.name+"欢迎来到图书小课堂");
        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！！");
        Scanner scanner=new Scanner(System.in);
        int choice=scanner.nextInt();
        return choice;
    }
}

NormalUser(普通用户)

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()

        };
    }

    @Override
    public int menu() {
    
        System.out.println("你好"+this.name+"欢迎来到图书小课堂！！！");
        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！！");
        System.out.println("请输入你的操作:");
        Scanner scanner=new Scanner(System.in);
        int choice=scanner.nextInt();
        return choice;
    }
}

Main类(和并)

import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;

import javax.naming.NamingEnumeration;
import java.util.Scanner;

public class Main {
    
    public static User login(){
    
        System.out.println("请输入姓名:");
        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();

       while(true){
    
           int choice=user.menu();
           user.abOperation(choice,bookList);
       }
    }
}