在java中从文本文件中删除行号

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class RemoveLineNumbers {
    public static void main(String[] args) {
        String inputFile = "input.txt"; // 原始文本文件路径
        String outputFile = "output.txt"; // 删除行号后的文本文件路径

        try {
            BufferedReader reader = new BufferedReader(new FileReader(inputFile));
            BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));

            String line;
            while ((line = reader.readLine()) != null) {
                // 判断每一行是否包含行号，可以使用正则表达式或字符串处理方法
                if (!line.matches("^\\d+\\..*")) {
                    writer.write(line);
                    writer.newLine();
                }
            }

            reader.close();
            writer.close();

            System.out.println("行号已成功删除并保存到新文件中。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}