一个图书管理系统的综合小练习

public class Book {
    private String bookId;
    private String name;
    private String author;
    private double price;

    public Book() {
    }

    public Book(String bookId, String name, String author, double price) {
        this.bookId = bookId;
        this.name = name;
        this.author = author;
        this.price = price;
    }

    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    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;
    }
}

import java.util.ArrayList;
import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        // 创建集合用于存储图书信息
        ArrayList list = new ArrayList();
        // 键盘录入
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请选择你要进行的操作");
            System.out.println("1:添加图书");
            System.out.println("2:查看图书");
            System.out.println("3:查询图书");
            System.out.println("4:修改图书");
            System.out.println("5:删除图书");
            System.out.println("6:退出系统");

            String type = sc.next();

            switch (type) {
                case "1":
                    // 添加
                    addBook(list);
                    break;
                case "2":
                    // 查看所有图书
                    findAllBooks(list);
                    break;
                case "3":
                    // 查询某本图书
                    findBookByName(list);
                    break;
                case "4":
                    // 修改图书
                    updateBook(list);
                    break;
                case "5":
                    // 删除图书
                    deleteBook(list);
                    break;
                case "6":
                    System.out.println("感谢使用，再见");
                    System.exit(0); // 退出系统
                default:
                    System.out.println("选择有误，请重新输入");
                    break;
            }

        }
    }

    // 删除图书
    private static void deleteBook(ArrayList list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要删除的图书编号：");
        String id = sc.服务器托管网next();
        for (int i = 0; i  list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要修改的图书编号：");
        String id = sc.next();
        for (int i = 0; i  list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要查询的图书名称：");
        String name = sc.next();
        for (int i = 0; i  list) {
        if (list == null || list.size() == 0) {
            System.out.println("尚无图书信息");
            return;
        }
        System.out.println("编号t" + "书名t" + "作者t" + "价格");
        for (int i = 0; i  list, String bookId) {
        // 遍历，如果发现相同id，返回true，
        for (int i = 0; i  list) {
        // 键盘录入
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入图书信息：");
        System.out.println("编号：");
        String bookId;
        while (true) {
            bookId = sc.next();
            // 查询编号是否存在
            if (isExist(list, bookId)) {
                System.out.println("该编号已经存在，请重新输入");
            } else {
                break;
            }
        }
        System.out.println("名称：");
        String name = sc.next();
        System.out.println("作者：");
        String author = sc.next();
        System.out.println("价格：");
        double price = sc.nextDouble();
        // 将信息封装到图书对象
        Book b = new Book(bookId, name, author, price);
        // 添加到集合
        list.add(b);
        System.out.println("~~~添加成功~~~");
    }
}