package chapter7;

import java.io.*;
import java.util.Scanner;

public class FileOperationHomework {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 1. 获取文件名
        System.out.print("请输入文件名：");
        String fileName = scanner.nextLine();

        // 2. 获取要写入的行数
        System.out.print("请输入要写入的行数：");
        int lines = scanner.nextInt();
        scanner.nextLine(); // 消除换行符

        // 3. 写入文件
        try (FileWriter writer = new FileWriter(fileName)) {
            // 循环获取用户输入并写入
            for (int i = 1; i <= lines; i++) {
                System.out.print("请输入第" + i + "行内容：");
                String content = scanner.nextLine();
                writer.write(content + "\n");
            }
            System.out.println("文件写入成功！");

        } catch (IOException e) {
            System.out.println("写入文件出错：" + e.getMessage());
            return;  // 如果写入出错，直接返回
        }

        // 4. 读取并显示文件内容
        System.out.println("\n文件内容如下：");
        System.out.println("--------------------");

        try (BufferedReader reader = new BufferedReader(
                new FileReader(fileName))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            System.out.println("--------------------");

        } catch (IOException e) {
            System.out.println("读取文件出错：" + e.getMessage());
        }
    }
}