java - 打印出文件包含的行数

Question

目前，当我输入有效的 .txt 文件时，我的代码不会执行任何操作。我想打印文件包含的行数。谁能告诉我为什么目前什么都没有发生？

public class Task3
{
    public static void main(String[] args) throws FileNotFoundException
    {
        // instance variables
        int characterCount = 0;
        int wordCount = 0;
        int lineCount = 0;
        // create a Scanner object to read in file name from console input
        Scanner in = new Scanner(System.in);
        System.out.print("Please enter the file name: ");
        String filename = in.next();
        File inputFile = new File(filename);


        // create a Scanner object to read the actual text file
        Scanner inFile = new Scanner(inputFile);

        int lines = 0;

        while (inFile.hasNextLine())
        { // enter while loop if there is a complete line available
        in.nextLine();
            lines++;
            // increase line counter variable
            }
          System.out.println(lines); 

Answer 1

您不是从文件中读取行，而是从标准输入中读取它们。