Java 文件结尾

Question

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner line = new Scanner(System.in);
        int counter = 1;
        
        while (line.hasNextLine()) {
            String line = line.nextLine();

            System.out.println(counter + " " + line);
            counter++;
        }
    }
}

任务：每一行将包含一个非空字符串。读取直到EOF。对于每一行，打印行号，后跟一个空格和行内容。

输入示例：

Hello world

I am a file

Read me until end-of-file.

示例输出：

1 Hello world

2 I am a file

3 Read me until end-of-file.

Answer 1

如果您想从文件进行扫描，可以使用以下代码。

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) throws FileNotFoundException {
        Scanner scan = new Scanner(new File("input.txt"));
        int counter = 1;
        while (scan.hasNextLine()) {
            String line = scan.nextLine();
            System.out.println(counter + " " + line);
            counter++;
        }
    }
}