1.图书管理系统展示

这是最终效果展示，可以根据输入身份的不同，从而进入不同的身份内容去，不同的身份内容有不同的功能

2.图书管理系统实现

2.1 book包

2.1.1 Book类

书类中封装度很高，一般不露出任何一点成员变量

package book;

public class Book {
    private String name;
    private String author;
    private double price;
    private String type;
    private boolean isBorrowed;

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

    public Book(String name, String author, double 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 double getPrice() {
        return price;
    }

    public void setPrice(double 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;
    }
}

2.1.1 BookList

BookList是一个书架，存储书，我们默认是10本书，并且给定三本默认的图书

package book;

public class BookList {
    Book[] books = new Book[10];

    private int usedSize;

    public BookList() {
        books[0] = new Book("三国演义","罗贯中",19,"小说");
        books[1] = new Book("西游记","吴承恩",29,"小说");
        books[2] = new Book("红楼梦","曹雪芹",9,"小说");
        usedSize = 3;
    }

    public void setBooks(int pos,Book book) {
        books[pos] = book;
    }

    public Book getBooks(int pos){
        return books[pos];
    }

    public void setUsedSize(int size){
        usedSize=size;
    }

    public int getUsedSize(){
        return usedSize;
    }
}

2.2 Operation包

2.2.1 IOperation接口

实现这个接口去让下方的类去实现

package operation;

import book.BookList;

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

2.2.2 AddOperation

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 curSize = bookList.getUsedSize();
        bookList.setBooks(curSize,book);
        bookList.setUsedSize(curSize+1);
        System.out.println("新增图书成功！");
    }
}

2.2.3 BorrowOperation

package operation;

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!");

        System.out.println("请输入要借阅图书的名字:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if(name.equals(bookList.getBooks(i).getName())){
                bookList.getBooks(i).setBorrowed(true);
                System.out.println("借阅成功！");
                return ;
            }
        }
    }
}

2.2.4 DelOperation

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("输入要删除的图书名称:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int curSize = bookList.getUsedSize();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if(name.equals(bookList.getBooks(i).getName())){
                for (int j = bookList.getUsedSize()-1; j > i ; j--) {
                    Book book = bookList.getBooks(j-1);
                    book=bookList.getBooks(j);
                }
                bookList.setUsedSize(curSize-1);
                return ;
            }
        }
    }
}

2.2.5 DisplayOperation

package operation;

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++) {
            System.out.println(bookList.getBooks(i));
        }
    }
}

2.2.6 ExitOperation

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);
    }
}

2.2.7 FindOperation

package operation;

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("请输入要查找图书的名字:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if(name.equals(bookList.getBooks(i).getName())){
                System.out.println("找到了这本书！");
                System.out.println(bookList.getBooks(i));
                return ;
            }
        }
    }
}

2.2.8 ReturnOperation

package operation;

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!");

        System.out.println("请输入要借阅图书的名字:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if(name.equals(bookList.getBooks(i).getName())){
                bookList.getBooks(i).setBorrowed(false);
                System.out.println("归还成功！");
                return ;
            }
        }
    }
}

2.3 user类

2.3.1 User抽象类

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){
        this.ioperations[choice].work(bookList);
    }

}

2.3.2 AdminUser

package user;

import operation.*;


import java.util.Scanner;

public class AdminUser extends User{
    public AdminUser(String name) {
        super(name);
        super.ioperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DisplayOperation()
        };
    }

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

2.3.3 NormalUser

package user;

import operation.*;

import java.util.Scanner;

public class NomalUser extends User {
    public NomalUser(String name) {
        super(name);
        super.ioperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation()
        };
    }

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

3. Main

串接上面所有内容，做到具体的实现

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 NomalUser(name);
        }
    }

    public static void main(String[] args) {
        BookList bookList = new BookList();
        User user = login();
        while(true){
            int choice = user.menu();
            user.doOperation(choice,bookList);
        }
    }
}