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Java Program to Get the File Extension
  • Difficulty Level : Basic
  • Last Updated : 07 Jan, 2021
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Getting the file extension of the file is through Java using File class of Java i.e. probeContentType() method. The File class is Java’s representation of a file or directory pathname. The File class contains several methods for working with the pathname, deleting and renaming files, creating new directories, listing the contents of a directory, and determining several common attributes of files and directories.

probeContentType() Method

The probeContentType() is a method that comes predefined in the Java File class. The parameter to this method is passed the path of the file.

Parameters: A path of the file.

Return value: It returns a string(extension).



In Java, we can get the filename by – 

File file = new File(“/home/mayur/GFG.java”);

String fileName = file.getName();

Below is the implementation of the problem statement: 

Java




// Java Program to Get the File Extension
  
import java.io.*;
import java.nio.file.Files;
  
public class GFG {
    public static void main(String[] args)
    {
        // File location
        File f = new File("/home/mayur/GFG.java");
  
        // If file exists
        if (f.exists()) {
            String fileType = "Undetermined";
            String fileName = f.getName();
            String extension = "";
            int i = fileName.lastIndexOf('.');
  
            if (i > 0) {
                extension = fileName.substring(i + 1);
            }
            try {
                fileType
                    = Files.probeContentType(f.toPath());
            }
            catch (IOException ioException) {
                System.out.println(
                    "Cannot determine file type of "
                    + f.getName()
                    + " due to following exception: "
                    + ioException);
            }
  
            // Print Extension
            System.out.println(
                "Extension used for file is -> " + extension
                + " and is probably " + fileType);
        }
        else {
            System.out.println("File does not exist!");
        }
    }
}

Output:

Java Program to Get the File Extension

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