Aug 26, 2010 · String getFileExtension(File file) { if (file == null) { return ""; } String name = file.getName(); int i = name.lastIndexOf('.'); String ext = i > 0 ? name.substring(i + 1) : ""; return ext; } Share

Jan 8, 2024 · In this article, we’ve explored various approaches to get the file extension from a given filename in Java. We can create a straightforward solution based on the standard String methods. In addition, popular libraries such as Apache Commons IO and Guava offer convenient helper methods to do the job easily.

Feb 20, 2024 · In this article, we will learn how to get the file extension in Java. A dot separates the filename from its file extension. For instance, "picture.jpg" has the extension "jpg " which tells us it's an image file. By extracting this extension your program can determine the type of file.

Jan 29, 2024 · In Java, a File Extension refers to the characters after the "." in a file name. It denotes the file type. For example, in the file name document.pdf, the file extension is pdf. This indicates that the file is a PDF format file. In this article, …

Feb 1, 2024 · Below are the three methods and their implementations to extract file extension from a file path String. 1. A Simple Method in Java. Method Overview: The method getFileExtension takes a file path as input. It utilizes the lastIndexOf method to find the last occurrence of the dot ('.') character in the file path.

Is there a better way to get file basename and extension than something like. File f = ... int dot = name.lastIndexOf('.'); Take a look at commons-io FilenameUtils. It has the getBaseName(..) and getExtension(..) methods. For only the extension, see stackoverflow.com/questions/3571223/… .

Java provides several ways to extract the file extension from a file name. The simplest approach is to use basic string manipulation methods. Additionally, you can use third-party libraries such as Apache Commons IO, which offers utility methods for handling file operations.

Jun 7, 2012 · As a rule of thumb, use equalsIgnoreCase() whenever you are going to check for equality between strings (assuming that you do want to ignore case). Eeek! This code is going to throw a StringIndexOutOfBoundsException when it encounters a filename without any dot/period.

To get the file extension of a file in Java, you can use the File class and its getName() method to get the file name, and then use the substring() method of the String class to extract the extension from the file name.

Nov 30, 2020 · This article shows how to get the file extension of a file in Java. Topics. Get file extension normal; Get file extension strict; Get file extension hardcode; Apache Common IO – FilenameUtils; Path: /path/foo.txt -> File Extension: txt Path: . -> File Extension: Path: ..