Change a file attribute to writable in Java

Java 8Object Oriented ProgrammingProgramming

The file attribute can be changed to writable using the method java.io.File.setWritable(). This method has a single parameter i.e. a boolean value that if true allows the file to be writable and if false disallows the file to be writable. Also, this method returns true if the operation is successful and false otherwise.

A program that demonstrates this is given as follows −

Example

 Live Demo

import java.io.File;
public class Demo {
   public static void main(String[] args) {
      try {
         File file = new File("demo1.txt");
         file.createNewFile();
         file.setReadOnly();
         System.out.println("The file can be written to? " + file.canWrite());
         file.setWritable(true);
         System.out.println("The file can be written to? " + file.canWrite());
      } catch(Exception e) {
         e.printStackTrace();
      }
   }
}

The output of the above program is as follows −

Output

The file can be written to? false
The file can be written to? true

Note − The output may vary on Online Compilers.

Now let us understand the above program.

The attribute of a file is changed to read-only first by using the method java.io.File.setReadOnly(). Then the file attribute is changed to writable using the method java.io.File.setWritable(). The method java.io.File.canWrite() is used to check whether the file is writable or not. A code snippet that demonstrates this is given as follows −

try {
   File file = new File("demo1.txt");
   file.createNewFile();
   file.setReadOnly();
   System.out.println("The file can be written to? " + file.canWrite());
   file.setWritable(true);
   System.out.println("The file can be written to? " + file.canWrite());
} catch(Exception e) {
   e.printStackTrace();
}
raja
Published on 25-Feb-2019 08:16:09
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