import java.io.File;  
import java.io.FileNotFoundException;  
import java.io.IOException;  
import java.util.ArrayList;  
  
  
public class readFile {  
    private static ArrayList<String> listname = new ArrayList<String>();  
    public static void main(String[] args)throws Exception{  
        readAllFile("data/");  
        System.out.println(listname.size());  
    }  
    public static void readAllFile(String filepath) {  
        File file= new File(filepath);  
        if(!file.isDirectory()){  
            listname.add(file.getName());  
        }else if(file.isDirectory()){  
            System.out.println("檔案");  
            String[] filelist=file.list();  
            for(int i = 0;i<filelist.length;i++){  
                File readfile = new File(filepath);  
                if (!readfile.isDirectory()) {  
                    listname.add(readfile.getName());  
                } else if (readfile.isDirectory()) {  
                    readAllFile(filepath + "\\" + filelist[i]);//遞迴  
                }  
            }  
        }  
        for(int i = 0;i<listname.size();i++){  
            System.out.println(listname.get(i));  
        }  
    }  
}