import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;public class FolderFileNames {public static void main(String[] args) {// 假设您要读取的文件夹路径是 "C:/exampleFolder"String folderPath = "homework";Set<String> setHomeWork = new HashSet<>();// 创建File对象表示文件夹File folder = new File(folderPath);// 确保文件夹存在且实际上是一个文件夹if (folder.exists() && folder.isDirectory()) {// 获取文件夹中的文件列表String[] fileNames = folder.list();// 遍历文件列表并打印文件名for (String fileName : fileNames) {System.out.println(fileName);setHomeWork.add(fileName.split("\\.")[0]);}} else {System.out.println("文件夹不存在或不是一个文件夹。");}Set<String> allStuNames = new HashSet<>();try {FileReader fileReader = new FileReader("file.txt");BufferedReader bufferedReader = new BufferedReader(fileReader);String line;while ((line = bufferedReader.readLine()) != null) {// 逐行处理文本内容System.out.println(line);allStuNames.add(line);}bufferedReader.close();} catch (IOException e) {e.printStackTrace();}allStuNames.removeAll(setHomeWork);System.out.println(allStuNames);}
}