基于JavaSE的简单图书管理系统的实现

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class 作业1 {

    public static List<Book> bookList = new ArrayList<>();

    public static void main(String[] args) throws Exception {
        File file = new File("book.txt");
        System.out.println(file.length());
        if (file.length() > 0) {
            ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
            bookList = (List<Book>) ois.readObject();
        }
        while (true) {
            System.out.println("欢迎访问图书管理系统" + "	");
            System.out.println("	" + "1.添加图书");
            System.out.println("	" + "2.修改图书");
            System.out.println("	" + "3.查看所有图书");
            System.out.println("	" + "4.退出");
            System.out.print("请选择：");
            Scanner sc = new Scanner(System.in);
            String choose = sc.next();
            switch (choose) {
                case "1":
                    add();
                    break;
                case "2":
                    update();
                    break;
                case "3":
                    select();
                    break;
                case "4":
                    exit();
                    break;
                default:
                    System.err.println("您的输入错误！请重新输入");
            }
        }
    }

    private static void add() throws FileNotFoundException, IOException, ClassNotFoundException {

        Scanner sc = new Scanner(System.in);
        System.out.print("请输入你要添加的图书的书名：");
        String bookName = sc.nextLine();
        System.out.print("请输入你要添加的图书的价格：");
        Double price = sc.nextDouble();
        bookList.add(new Book(bookName, price));
        System.out.println("添加成功！");
        System.out.println();
    }

    private static void exit() throws FileNotFoundException, IOException, ClassNotFoundException {

        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("book.txt"));
        oos.writeObject(bookList);
        System.out.println("下次再见");
        System.exit(0);
    }

    private static void select() throws FileNotFoundException, IOException, ClassNotFoundException {
//		
        for (Book book : bookList) {
            System.out.print("书名---");
            System.out.print(book.getBookName());
            System.out.print("	" + "价格---");
            System.out.println(book.getPrice());
        }
    }

    private static void update() throws Exception {
        System.out.print("请输入要修改的书名");
        Scanner sc = new Scanner(System.in);
        String bookName = sc.next();
        for (int i = 0; i < bookList.size(); i++) {
            Book book = bookList.get(i);
            if (bookName.equals(book.getBookName())) {
                System.out.print("请输入想要修改的价格：");
                double price = sc.nextDouble();
                bookList.add(new Book(book.getBookName(), price));
                bookList.remove(book);
                System.out.println("修改成功");
                return;
            }
        }
        System.err.println("没有这本书。。。");
    }

}

附： Book类

import java.io.Serializable;

public class Book implements Serializable{
	private String bookName;
	private Double price;
	public String getBookName() {
		return bookName;
	}
	public void setBookName(String bookName) {
		this.bookName = bookName;
	}
	public Double getPrice() {
		return price;
	}
	public void setPrice(Double price) {
		this.price = price;
	}
	public Book(String bookName, Double price) {
		super();
		this.bookName = bookName;
		this.price = price;
	}
	public Book() {
		super();
		
	}
	@Override
	public String toString() {
		return "Book [bookName=" + bookName + ", price=" + price + "]";
	}
	
}