for-each循环错误

Question

Java For-each-loop:我正在尝试映射从下面的操作检索到的数据，并将其映射到一个对象模型。不幸的是，它只输出检索对象中的最后一个对象。请大家检查一下代码中可能存在的问题。

public void listAllFilesInTheDirectoryAndSubdirectories(String aDirectoryName){ 
    AppDirectory appdirectory = new AppDirectory();
    PictureFile picturefile = new PictureFile();

    ArrayList<AppDirectory> subdirectories = new ArrayList<AppDirectory>();
    ArrayList<PictureFile> picturefiles = new ArrayList<PictureFile>(); 

    appdirectory.setName(aDirectoryName); 
    appdirectory.setPictureFiles(picturefiles);
    appdirectory.setSubDirectories(subdirectories); 

    File directory = new File(aDirectoryName); 
    //get all the files from a directory
    File[] allFiles = directory.listFiles();
    //Using a for-each loop to loop through each file in the list of files returned 
    for (File file : allFiles){ 
       //Check if the file is-a-file, then print it out          
       if (file.isFile()){

           String filePath = file.getAbsolutePath();
           String fileName = file.getName();
           String folderName = file.getParentFile().getName();

           if(folderName.equals(aDirectoryName)){

               System.out.println("Directory Name is : "+appdirectory.getName());
               System.out.println(folderName);
               System.out.println(fileName);
               picturefile.setName(fileName);
               picturefile.setType("jpeg");
               picturefile.setLength(2354); 
               Dimension dimension = new Dimension(656, 413);
               picturefile.setSize(dimension);
               picturefile.setLength(50023); 

               appdirectory.addPictureFile(picturefile); 


            }else{
              //appdirectory.setName(folderName); 
              //picturefile.setName(filePath); 
              //appdirectory.addPictureFile(picturefile); 
              //subdirectories.add(appdirectory);                  

            }         

    }else if(file.isDirectory()){
        listAllFilesInTheDirectoryAndSubdirectories(file.getAbsolutePath());

    }

 }
   // System.out.println(picturefiles.size()); 

    for(int x = 0; x<appdirectory.getPictureFiles().size(); x++){
      System.out.println(appdirectory.getPictureFiles().get(x).getName());

    } 

}

Answer 1

移动此行

PictureFile picturefile = new PictureFile();

在循环中，否则您只更新一个元素。