Delete all files in directory (but not directory) - one liner solution

Question

I want to delete all files inside ABC directory.

When I tried with FileUtils.deleteDirectory(new File(\"C:/test/ABC/\")); it also deletes folder ABC.

Answer 1

I think this will work (based on NonlinearFruit previous answer):

Files.walk(Paths.get("C:/test/ABC/"))
                .sorted(Comparator.reverseOrder())
                .map(Path::toFile)
                .filter(item -> !item.getPath().equals("C:/test/ABC/"))
                .forEach(File::delete);

Cheers!

Answer 2

package com;
import java.io.File;
public class Delete {
    public static void main(String[] args) {

        String files; 
        File file = new File("D:\\del\\yc\\gh");
        File[] listOfFiles = file.listFiles(); 
        for (int i = 0; i < listOfFiles.length; i++) 
        {
            if (listOfFiles[i].isFile()) 
            {
                files = listOfFiles[i].getName();
                System.out.println(files);
                if(!files.equalsIgnoreCase("Scan.pdf"))
                {
                    boolean issuccess=new File(listOfFiles[i].toString()).delete();
                    System.err.println("Deletion Success "+issuccess);
                }
            }
        }
    }
}

If you want to delete all files remove

if(!files.equalsIgnoreCase("Scan.pdf"))

statement it will work.

Answer 3

import org.apache.commons.io.FileUtils;

FileUtils.cleanDirectory(directory); 

There is this method available in the same file. This will also recursively deletes all sub-folders and files under them.

Docs: org.apache.commons.io.FileUtils.cleanDirectory

Answer 4

Do you mean like?

for(File file: dir.listFiles()) 
    if (!file.isDirectory()) 
        file.delete();

This will only delete files, not directories.

Answer 5

Java 8 Stream

This deletes only files from ABC (sub-directories are untouched):

Arrays.stream(new File("C:/test/ABC/").listFiles()).forEach(File::delete);

---

This deletes only files from ABC (and sub-directories):

Files.walk(Paths.get("C:/test/ABC/"))
                .filter(Files::isRegularFile)
                .map(Path::toFile)
                .forEach(File::delete);

^ This version requires handling the IOException

Answer 6

Or to use this in Java 8:

try {
  Files.newDirectoryStream( directory ).forEach( file -> {
    try { Files.delete( file ); }
    catch ( IOException e ) { throw new UncheckedIOException(e); }
  } );
}
catch ( IOException e ) {
  e.printStackTrace();
}

It's a pity the exception handling is so bulky, otherwise it would be a one-liner ...