I want to search multiple files from a bundle of around 2000 files and copy the searched file to a new location.

Question

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I have a zip file in which there are around 2000 files (in Zip and PDF Format), i want to search the files which begin with '0' or '1' or '2' & copy these files to a new location.

What I have tried:

I tried the below code, but this code is only searching files beginning with '0' and also not copying these files to a new location.

import java.io.*;
import java.util.*;
import java.lang.*;

public class Main { 
   public static void main(String[] args) {
      File dir = new File("E:\\abc");
      FilenameFilter filter = new FilenameFilter() {
         public boolean accept (File dir, String name) { 
            return name.startsWith("0");
         } 
      }; 
      String[] children = dir.list(filter);
      if (children == null) {
         System.out.println("Either dir does not exist or is not a directory"); 
      } else { 
         for (int i = 0; i< children.length; i++) {
            String filename = children[i];
            System.out.println(filename);
         } 
      } 
   } 
}

Posted 25-Apr-20 20:14pm

Mubasshir Farooque

Updated 27-Apr-20 3:11am

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2 solutions

Solution 1

You need to Override the accept(), see: java - Use of FilenameFilter - Stack Overflow[^]

You can use Files.copy() to copy files, see: How to Copy a File with Java | Baeldung[^]

Posted 25-Apr-20 20:24pm

RickZeeland

Updated 25-Apr-20 20:29pm

v2

Comments

Mubasshir Farooque 26-Apr-20 2:45am

Could you please help me with the proper code, as I am not much familiar with it.

RickZeeland 26-Apr-20 5:00am

Neither am I, as I'm not a Java but a C# programmer :)
Maybe a real Java developer will come to the rescue ...

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JudyL_MD · Accepted Answer · 2020-04-27T03:13:00

You say you want to use files that start with "0" "1" or "2" but you only accept files that start with "0". The code is doing exactly what you told it to do.

public boolean accept (File dir, String name) { 
            return name.startsWith("0");
         }

You need to modify your accept code to handle all three cases

<pre>public boolean accept (File dir, String name) { 
            return name.startsWith("0") || name.startsWith("1") || name.startsWith("2");
         }

As for copying, try the java.nio.file.Files.copy function.