Get a file extension of a file in Java

In this source code example, we show you how to get a file extension of a file in Java.

Get file extension of a file in Java

The below FileUtils class contains getFileExtension() utility method to get a file extension of a file in Java.
package com.javaguides.javaio.utility;

import java.io.File;

/**
 * Commonly used file utility methods.
 * @author javaguides.net
 *
 */
public class FileUtils {
    /**
     *  Get file extension such as "txt","png","pdf"
     * @param file
     * @return
     */
    public static String getFileExtension(File file){
     String fileName = file.getName();
        if(fileName.lastIndexOf('.') != -1 && fileName.lastIndexOf('.') != 0){
         return fileName.substring(fileName.lastIndexOf('.')+1); 
        }else{
         return "File don't have extension";
        }
    }
    
    /**
     * Check for file extension
     * @param file
     * @param extension
     * @return
     */
    public static boolean hasExtension(String file, String extension) {
        return file.endsWith(extension);
    }
}

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