Javaスキャンフォルダの下のすべてのファイル名

package q.test.filescanner; 

import java.io.File; 
import java.util.ArrayList; 
import java.util.LinkedList; 

import q.test.filescanner.exception.ScanFilesException; 

/** 
 * @author 
 */ 
public class FolderFileScanner { 

  private static ArrayList<Object> scanFiles = new ArrayList<Object>(); 

  /**linkedList  **/ 
  private static LinkedList<File> queueFiles = new LinkedList<File>(); 


  /** 
   * TODO:                 
   * @return ArrayList<Object> 
   * @author
   * @time 2017 11 3  
   */ 
  public static ArrayList<Object> **scanFilesWithRecursion**(String folderPath) throws ScanFilesException{ 
    ArrayList<String> dirctorys = new ArrayList<String>(); 
    File directory = new File(folderPath); 
    if(!directory.isDirectory()){ 
      throw new ScanFilesException('"' + folderPath + '"' + " input path is not a Directory , please input the right path of the Directory. ^_^...^_^"); 
    } 
    if(directory.isDirectory()){ 
      File [] filelist = directory.listFiles(); 
      for(int i = 0; i < filelist.length; i ++){ 
        /**        ，         **/ 
        if(filelist[i].isDirectory()){ 
        //        
          dirctorys.add(filelist[i].getAbsolutePath()); 
          /**          **/ 
          **scanFilesWithRecursion**(filelist[i].getAbsolutePath()); 
        } 
        /**    **/ 
        else{ 
          scanFiles.add(filelist[i].getAbsolutePath()); 
        } 
      } 
    } 
    return scanFiles; 
  } 

  /** 
   * 
   * TODO:                    
   * @return ArrayList<Object> 
   * @param folderPath                
   * @author 
   * @time 2017 11 3  
   */ 
  public static ArrayList<Object> scanFilesWithNoRecursion(String folderPath) throws ScanFilesException{ 
    File directory = new File(folderPath); 
    if(!directory.isDirectory()){ 
      throw new ScanFilesException('"' + folderPath + '"' + " input path is not a Directory , please input the right path of the Directory. ^_^...^_^"); 
    } 
    else{ 
      //             
      File [] files = directory.listFiles(); 
      //         ，      ，     linkedList      
      for(int i = 0; i < files.length; i ++){ 
        if(files[i].isDirectory()){ 
          queueFiles.add(files[i]); 
        }else{ 
          //        scanFiles  
          scanFiles.add(files[i].getAbsolutePath()); 
        } 
      } 

      //  linkedList    linkedList 
      while(!queueFiles.isEmpty()){ 
        //  linkedList      
        File headDirectory = queueFiles.removeFirst(); 
        File [] currentFiles = headDirectory.listFiles(); 
        for(int j = 0; j < currentFiles.length; j ++){ 
          if(currentFiles[j].isDirectory()){ 
            //        ，    linkedList  
            queueFiles.add(currentFiles[j]); 
          }else{ 
            scanFiles.add(currentFiles[j].getAbsolutePath()); 
          } 
        } 
      } 
    } 

    return scanFiles; 
  } 
}