Java – find specific file types from folders and their subfolders

I'm writing a method to get specific file types from folders and subfolders, such as PDF or txt, but I can't solve this problem This is my code

// .............list file
    File directory = new File(directoryName);

    // get all the files from a directory
    File[] fList = directory.listFiles();

    for (File file : fList) {
        if (file.isFile()) {
            System.out.println(file.getAbsolutePath());
        } else if (file.isDirectory()) {
            listf(file.getAbsolutePath());
        }
    }

My current method lists all files, but I need specific files

Solution

if(file.getName().endsWith(".pdf")) {

if(file.getName().endsWith(".pdf")) {
    //it is a .pdf file!
}

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