How to delete all java files

How to delete all java files

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Java — How to Delete Files and Folders?

A quick guide to delete the files and folders in java with example programs.

1. Overview

In this tutorial, We will learn how to delete the files and folders in java.

Let us learn the example programs on file deletion and folder removal in java.

2. Java Files Delete Example

First, Use delete() method on the file object to delete the file. Returns true if the file is delete successfully and else return false if there are any failures.

In the below program, we have taken two files test.log file is present in the location and no-file.log does not exists on the location.

Let us see the behaviour of delete() method.

package com.javaprogramto.files.delete; import java.io.File; /** * How to delete the file in java using File api delete() method. * * @author JavaProgramTo.com * */ public class FileDelete < public static void main(String[] args) < // File deletion success String fileName = "src/main/java/com/javaprogramto/files/delete/test.log"; File file = new File(fileName); boolean isFileDeleted = file.delete(); if(isFileDeleted) < System.out.println("File deleted without any errors for "+fileName); >else < System.out.println("File deletion is failed"); >// File deletion error. fileName = "src/main/java/com/javaprogramto/files/delete/no-file.log"; file = new File(fileName); isFileDeleted = file.delete(); if(isFileDeleted) < System.out.println("File deleted without any errors for "+fileName); >else < System.out.println("File deletion is failed for "+fileName); >> >

File deleted without any errors for src/main/java/com/javaprogramto/files/delete/test.log File deletion is failed for src/main/java/com/javaprogramto/files/delete/no-file.log

3. Java Delete Folder Example

Next, we will try to delete the folder which is having the files and next empty folder deletion using delete() method.

package com.javaprogramto.files.delete; import java.io.File; /** * How to delete the folder in java using File API delete() method. * * @author JavaProgramTo.com * */ public class FileDeleteFolder < public static void main(String[] args) < // Folder deletion not done String folderName = "src/main/java/com/javaprogramto/files/delete"; File file = new File(folderName); boolean isFileDeleted = file.delete(); if(isFileDeleted) < System.out.println("Folder with files is deleted"); >else < System.out.println("Folder with files is not deleted"); >// Empty Folder deletion success . folderName = "src/main/java/com/javaprogramto/files/emptyfolder"; file = new File(folderName); isFileDeleted = file.delete(); if(isFileDeleted) < System.out.println("Empty Folder deleted "); >else < System.out.println("Empty Folder deletion is failed for "+folderName); >> >

Folder with files is not deleted Empty Folder deleted

Note: if the folder is empty then only folder will be deleted and folder which has files won’t be deleted. But, we can delete the files folder after deleting all files.

4. Conclusion

In this article, we’ve seen how to delete the files and folder in java with examples.

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How to delete a directory recursively in Java

In an earlier article, we looked at different ways of deleting a directory in Java. In this article, you’ll learn how to delete a non-empty directory recursively — delete all its files and sub-folders.

Java provides multiple methods to delete a directory. However, the directory must be emptied before we delete it. To remove all contents of a particular directory programmatically, we need to use recursion as explained below:

1. List all contents (files & sub-folders) of the directory to be deleted.
2. Delete all regular files of the current directory (exist from recursion).
3. For each sub-folder of the current directory, go back to step 1 (recursive step).
4. Delete the directory.

Let us look at different ways to implement the above simple recursive algorithm.

In Java 8 or higher, you can use Files.walk() from NIO API (classes in java.nio.* package) to recursively delete a non-empty directory. This method returns a Stream that can be used to delete all files and sub-folders as shown below:

try  // create a stream StreamPath> files = Files.walk(Paths.get("dir")); // delete directory including files and sub-folders files.sorted(Comparator.reverseOrder()) .map(Path::toFile) .forEach(File::deleteOnExit); // close the stream files.close(); > catch (IOException ex)  ex.printStackTrace(); > 

In the above example, Files.walk() returns a Stream of Path . We sorted it in the reverse order to place the paths indicating the contents of directories before directories itself. Afterward, it maps Path to File and deletes each File .

To delete a non-empty directory using Java legacy I/O API, we need to manually write a recursive function to implement the above algorithm. Here is how it looks like:

public void deleteDir(File dir)  File[] files = dir.listFiles(); if(files != null)  for (final File file : files)  deleteDir(file); > > dir.delete(); > 

As you can see above, we are using File.listFiles() method to list all files and sub-directories in the directory. For each file, we recursively call deleteDir() method. In the end, we delete the directory using File.delete() . Now you can call the above method as follows:

File dir = new File("dir"); deleteDir(dir); 

The Apache Commons IO library provides FileUtils.deleteDirectory() method to delete a directory recursively including all files and sub-directories:

try  // directory path File dir = new File("dir"); // delete directory recursively FileUtils.deleteDirectory(dir); > catch (IOException ex)  ex.printStackTrace(); > 

dependency> groupId>commons-iogroupId> artifactId>commons-ioartifactId> version>2.6version> dependency> 

implementation 'commons-io:commons-io:2.6' 

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