August 14, 2022

How to delete directory in Java

If we use the NIO Files.delete to delete a non-empty directory in Java, it throws DirectoryNotEmptyException; for legacy IO File.delete to delete a non-empty directory, it returns a false. The standard solution is to loop the directory recursively, and delete all its children’s contents first (sub-files or sub-directories), and delete the parent later. This example shows some common ways to delete a directory in Java: (1) Files.walkFileTree + FileVisitor (Java 7), (2) Files.walk (Java 8), (3) FileUtils.deleteDirectory (Apache Common IO), (4) Recursive delete in a directory (Plain Java code).

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How to create directory in Java

In Java, we can use the NIO Files.createDirectory to create a directory or Files.createDirectories to create a directory including all nonexistent parent directories. For legacy IO java.io.File, the similar methods are file.mkdir() to create a directory, and file.mkdirs() to create a directory including all nonexistent parent directories. In legacy IO, the lack of exception thrown in creating directory makes developers very hard to debug or understand why we cannot create a directory, and this is one of the reasons Java releases a new java.nio.Files to throw a proper exception.

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How to write data to a temporary file in Java

The temporary file is just a regular file created on a predefined directory. In Java, we can use the NIO Files.write() to write data to a temporary file. In Java, there are many ways to write data or text to a temporary file; it works like writing to a regular file. You can choose BufferedWriter, FileWriter etc, but in most cases, the NIO java.nio.Files should be enough to write or append data to a file.

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How to create a temporary file in Java

In Java, we can use the Java NIO Files.createTempFile() methods to create a temporary file in the default temporary-file directory. The default temporary file folder is vary on operating system: Windows – %USER%\AppData\Local\Temp, Linux – /tmp . We can use the legacy Java IO java.io.* to create a temporary file, it still works perfectly, but the new Java NIO should always be the first choice.

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