编写一个带有文件的Java程序，读取字符，行和单词的数量。它在运行时找不到txt文件

Question

我创建了一个带有随机文本的txt文件，该文件已输入到我的代码中。当我键入文件来运行它（它不是硬编码）时，它会不断给出我设置的错误。我该如何解决这个问题？

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

public class P7_5
{
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Please enter file name: ");
    String fileName = input.next();

    File file = new File(fileName); //hard code file here
    Scanner in = new Scanner(System.in);

    try {
        in = new Scanner(file);
    } catch (FileNotFoundException e) {
        System.out.println("File was not found!");
    }

    int numLines = 0;
    int numWords = 0;
    int numCharacters = 0;
    while (in.hasNextLine()) {
        String line = in.nextLine();
        String[] words = line.split("\\s+");

        numLines += 1;
        numCharacters += line.length();
        numWords = words.length;
    }

    in.close();

    System.out.printf("Number of lines are: \n", numLines);
    System.out.printf("Number of words are: \n", numWords);
    System.out.printf("Number of characters are: \n", numCharacters);
}

}