How to make a file read-only?

Problem & Solution

This example demonstrates how to make a file read-only by using file.setReadOnly() and file.canWrite() methods of File class .

JAVA Program

import java.io.File;

public class Main {
   public static void main(String[] args) {
      File file = new File("C:/java.txt");
      System.out.println(file.setReadOnly());
      System.out.println(file.canWrite());
   }
}

Output

The above code sample will produce the following result (if the file “java.txt” exists in ‘C’ drive).

True
False