import java.io.File;

//遍历目录
public class homework2 {
    public static void main(String[] args) {
        File f1=new File("E:\\java");
        getAllFileName(f1);
    }
    public static  void getAllFileName(File f){
        File[] ff=f.listFiles();
//为了程序健壮性
        if(ff!=null){
        for(File fff:ff){
           if(fff.isDirectory()){
               getAllFileName(fff);
           }
           else{
               System.out.println(fff.getName());
           }

        }
    }}
}