How Can I Efficiently Retrieve File Extensions in Java?

Retrieving File Extensions in Java

In Java, obtaining the file extension of a file can be achieved using the FilenameUtils.getExtension method from the Apache Commons IO library. This method provides a convenient and efficient way to extract the extension from a file path or file name.

Usage:

To utilize the FilenameUtils.getExtension method, include the following Maven dependency in your project:

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.6</version>
</dependency>

You can specify either a full file path or just the file name as the input to the method:

String ext1 = FilenameUtils.getExtension("/path/to/file/foo.txt"); // returns "txt"
String ext2 = FilenameUtils.getExtension("bar.exe"); // returns "exe"

Additional Options:

The Apache Commons IO library offers several other methods for working with file extensions:

• FilenameUtils.getExtension(String, String): Gets the extension of a file, optionally including the dot separator.
• FilenameUtils.removeExtension(String): Removes the extension from a file name.
• FilenameUtils.getBaseName(String): Gets the base name of a file without the extension.
• FilenameUtils.wildcardMatch(String, String): Checks if a file name matches a wildcard pattern.

By employing these methods, developers can conveniently handle file extensions in various Java applications.

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