I/O图书管理系统（简单版，待完善）

  1 import java.io.*;
  2 import java.util.ArrayList;
  3 import java.util.List;
  4 import java.util.Scanner;
  5 
  6 /**
  7  * @ClassName: demo30
  8  * @Description: javase学习-图书管理系统I/O  https://www.bilibili.com/video/BV1Gv411T7pi?p=85
  9  * @author: 罗一帆
 10  * @date: 2022/10/1  14:26
 11  */
 12 public class demo30 {
 13 
 14     private static List<Book> LIST = new ArrayList<>();
 15 
 16 
 17     public static void main(String[] args) {
 18         readData();
 19         Scanner scanner = new Scanner(System.in);
 20         while (true) {
 21             System.out.println("======= 图书管理系统 =======");
 22             System.out.println("1.插入信息");
 23             System.out.println("2.修改信息");
 24             System.out.println("3.查询图书列表");
 25             System.out.println("4.删除图书");
 26             System.out.println("（按其他任意键退出系统）");
 27             String str = scanner.nextLine();
 28             switch (str){
 29                 case "1":
 30                     System.out.println("请依次输入书籍名称-作者-价格");
 31                     insertBook(scanner);
 32                     break;
 33                 case "2":
 34                     System.out.println("请输入要修改的编号");
 35                     modifyBook(scanner);
 36                     break;
 37                 case "3":
 38                     showBooks();
 39                     break;
 40                 case "4":
 41                     System.out.println("请输入要删除数除书的序号");
 42                     deleteBook(scanner);
 43                     break;
 44                 default:
 45                     saveData();
 46                     scanner.close();
 47                     return;
 48             }
 49         }
 50     }
 51 
 52     private static void readData(){
 53         File file = new File("D:\\IDEA_workspace\\absolute-path");
 54         if (file.exists()) {
 55             try (ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("D:\\IDEA_workspace\\absolute-path\\IOlibrarManageSystem.txt"))){
 56                 LIST = (List<Book>) inputStream.readObject();
 57             }catch (IOException | ClassNotFoundException e){
 58                 e.printStackTrace();
 59             }
 60         }else {
 61             LIST = new ArrayList<>();
 62         }
 63     }
 64 
 65     private static void saveData(){
 66         try (ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("D:\\IDEA_workspace\\absolute-path\\IOlibrarManageSystem.txt"))){
 67             outputStream.writeObject(LIST);
 68             outputStream.flush();
 69         }catch (IOException e){
 70             e.printStackTrace();
 71         }
 72     }
 73 
 74     private static void modifyBook(Scanner scanner) {
 75         int i = 0;
 76         for(Book book : LIST){
 77             System.out.println(i+"."+book);
 78             i++;
 79         }
 80         int index = scanner.nextInt();
 81         scanner.nextLine();
 82         if(index>=LIST.size()) System.out.println("错误的序号");
 83         else {
 84             System.out.println("请依次输入书籍名称-作者-价格");
 85             LIST
 86                     .get(index)
 87                     .name(scanner.nextLine())
 88                     .author(scanner.nextLine())
 89                     .price(scanner.nextDouble());
 90         }
 91         scanner.nextLine();
 92     }
 93 
 94     private static void deleteBook(Scanner scanner){
 95         int index = scanner.nextInt();
 96         int i = 0;
 97         for(Book book : LIST){
 98             System.out.println(i+"."+book);
 99             i++;
100         }
101         if(index>=LIST.size()) System.out.println("错误的序号");
102         else LIST.remove(index);
103         scanner.nextLine();
104     }
105 
106     private static void showBooks(){
107         LIST.forEach(System.out::println);
108     }
109 
110     private static void insertBook(Scanner scanner){
111         Book book = new Book()
112                 .name(scanner.nextLine())
113                 .author(scanner.nextLine())
114                 .price(scanner.nextDouble());
115         LIST.add(book);
116         scanner.nextLine();
117     }
118 
119     private static class Book implements Serializable{
120         String name;
121         String author;
122         double price;
123 
124         public Book name(String name){
125             this.name = name;
126             return this;
127         }
128 
129         public Book author(String author){
130             this.author = author;
131             return this;
132         }
133 
134         public Book price(double price){
135             this.price = price;
136             return this;
137         }
138 
139         @Override
140         public String toString() {
141             return "书籍{" +
142                     "名称='" + name + '\'' +
143                     ", 作者='" + author + '\'' +
144                     ", 价格=" + price +
145                     '}';
146         }
147     }
148 
149 }