java - 在指定文件夹中查找扩展名为.java的文件

Question

任务:

Write a Java application that accepts two file names as arguments: dirName and fileName Find all non-directory files contained in directory dirName whose name ends in ".java"

我尝试使用此代码，但如何打印以“.java”结尾的文件？这是我第一次使用这些东西，我不知道如何使用它们。

import java.io.File;
import java.io.FilenameFilter;

public class Filter {

    public static File[] finder(String dirName){
        File dir = new File(dirName);

        return dir.listFiles(new FilenameFilter() { 
                 public boolean accept(File dir, String filename)
                      { return filename.endsWith(".txt"); }
        });

    }

    public static void main(String[] args){
        String dirName = "src";
        System.out.println(finder(dirName));

    }

}

Answer 1

return !dir.isDirectory() && filename.endsWith(".java");