将JFileChoser实现为当前代码

Question

我需要帮助将JFileChooser实现到此程序中。对于这个问题，我想制作将读取文件并显示该文件中的字符，单词和行数的代码。我的教授评论了我的任务并说“仍然找不到文件 - 使用FileChooser并重新提交。”感谢任何帮助，谢谢你提前。

import java.io.*;
import java.util.*;

public class C12E13 {
    public static void main(String[] args) {
        while (true) {
            System.out.println("The program will count the number of characters, words, and lines in a file");
            System.out.println("Input File Name");
            Scanner input = new Scanner(System.in);
            String filename = input.nextLine();
            File source = new File(filename);
            if (!source.exists()) {
                System.out.println(filename + " File does not exist");
                System.exit(2);
            }

            try {
                Scanner infile = new Scanner(source);
                String line;
                int charactersCount = 0;
                int wordsCount = 0;
                int linesCount = 0;
                while (infile.hasNextLine()) {
                    line = infile.nextLine();
                    linesCount++;
                    String[] words = line.split("");
                    wordsCount += words.length;
                    for (String token : words) {
                        charactersCount += token.length();
                    }
                }
                System.out.println("Name of the input file:" + filename);
                System.out.println("Number of lines in the file:" + linesCount);
                System.out.println("Number of words in the file:" + wordsCount);
                System.out.println("Number of characters in the file:" + charactersCount);
                infile.close();
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println("Do you want input again Y/N");
                Scanner scan = new Scanner(System.in);
                String inp = scan.nextLine();
                if (inp.equals("N")) {
                    break;
                }
            }
        }
    }
}