无论newline类型如何,都可以删除Java中文件的第一行,而无需调用exec或逐行迭代

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String fileName = "example.txt";

        try {
            // 读取文件第一行
            BufferedReader reader = new BufferedReader(new FileReader(fileName));
            String line = reader.readLine();

            // 删除第一行
            line = line.substring(1);
            System.out.println(line);

            reader.close();
        } catch (IOException e) {
            System.err.format("Exception occurred trying to read '%s'.", fileName);
            e.printStackTrace();
        }
    }
}