Question

So I found some code earlier that looks like it would work but it doesn’t call to delete the files just to list them. What do I need to add so that it deletes the files?

import java.io.File;
import java.util.regex.Pattern;

public class cleardir {
    static String userprofile = System.getenv("USERPROFILE"); 

    private static void walkDir(final File dir, final Pattern pattern) {   
        final File[] files = dir.listFiles();   
        if (files != null) {     
            for (final File file : files) {       
                if (file.isDirectory()) {         
                    walkDir(file, pattern);       
                    } else if (pattern.matcher(file.getName()).matches()) { 
                        System.out.println("file to delete: " + file.getAbsolutePath());  
                        }     }   } }  
    public static void main(String[] args) {   
        walkDir(new File(userprofile+"/Downloads/Software_Tokens"), 
                Pattern.compile(".*\\.sdtid")); 
        } 
}

Answer 1

public class cleardir {
static String userprofile = System.getenv("USERPROFILE");
   private static final String FILE_DIR = userprofile+"\\Downloads\\Software_Tokens";
   private static final String FILE_TEXT_EXT = ".sdtid";

   public static void run(String args[]) {
    new cleardir().deleteFile(FILE_DIR,FILE_TEXT_EXT);
   }

   public void deleteFile(String folder, String ext){

     GenericExtFilter filter = new GenericExtFilter(ext);
     File dir = new File(folder);
     if (dir.exists()) { 
     //list out all the file name with .txt extension
     String[] list = dir.list(filter);

     if (list.length == 0) return;

     File fileDelete;

     for (String file : list){
    String temp = new StringBuffer(FILE_DIR)
                      .append(File.separator)
                      .append(file).toString();
        fileDelete = new File(temp);
        boolean isdeleted = fileDelete.delete();
        System.out.println("file : " + temp + " is deleted : " + isdeleted);
     }
   }
   }
   //inner class, generic extension filter 
   public class GenericExtFilter implements FilenameFilter {

       private String ext;

       public GenericExtFilter(String ext) {
         this.ext = ext;             
       }

       public boolean accept(File dir, String name) {
         return (name.endsWith(ext));
       }
    }
}