How To Hide A File In Java

First, you should be aware of what java NIO is:-

Java has given a subsequent I/O framework called NIO (New I/O). Java NIO furnishes an alternate method for working with I/O than the standard I/O API’s. It is another I/O API for Java.
It bolsters a cushion situated, a channel-based methodology for I/O activities. With the presentation of JDK 7, the NIO framework is extended, giving improved help to document framework highlights and a record deal with. Because of the capacities upheld by the NIO record classes, NIO is broadly utilized in a document dealing with.
NIO was created to enable Java software engineers to actualize rapid I/O without utilizing the custom local code. NIO moves the time-taking I/O exercises like filling, specifically and depleting supports, and so forth once more into the working framework, in this manner takes into consideration an extraordinary increment in operational speed.

you can achieve your goal by:-

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
 
class HiddenFile {
        public static void main(String[] args) throws IOException {
        
        String Filepath = "C:/skr/important_documents.txt";
        File file = new File(Filepath);
        
        if(file.isHidden())
            System.out.println("File is hidden");
        else
            System.out.println("File is visible");
       
        Path p = Paths.get("C:/skr/important_documents.txt");
        Files.setAttribute(p, "dos:hidden", true, LinkOption.NOFOLLOW_LINKS);
        
        if(file.isHidden())
            System.out.println("File is hidden");
        else
            System.out.println("File is visible");
 
    }
 
}

output:-

File is visible 
File is hidden

This program also shows us if a file is hidden or not in Java.

Also read:

• Find the last modified date and time of a file in Java