Change the Read and Write Permissions of a File in Java

In Java, file permissions differ depending on the operating system: *nix, NTFS(windows) and FAT/FAT32. All of them have different file permissions.

Check if the permission allows to:

file.canExecute(): returns true if the file is executable, otherwise false.
file.canWrite(): returns true, if The file is editable, otherwise false.
file.canRead(): returns true, if the file is readable, otherwise false.

Change file permission

file.setExecutable(boolean): Allow operations to be executed.
file.setReadable(boolean): Allow the reading of operations.
file.canRead(): allow write operations.

 
import java.io.File; 
import java.io.IOException; 

public class ExampleFilePermission 
{
 public static void main( String[] args )
 { 
 File file = new File("test.txt"); 
 
 if(file.exists()){
 System.out.println("Execution allowed: " + file.canExecute()); 
 System.out.println("Write allowed: " + file.canWrite()); 
 System.out.println("Read Allowed: " + file.canRead()); 
 }
 
 file.setExecutable(false); 
 file.setReadable(false); 
 file.setWritable(false); 
 
 System.out.println("Execution allowed: " + file.canExecute()); 
 System.out.println("Write allowed: " + file.canWrite()); 
 System.out.println("Read Allowed: " + file.canRead()); 
 }
}

Output:

 
Execution allowed: true
Write allowed: true
Read allowed: true
Execution allowed: false
Write allowed: false
Read allowed:  false

Resources:

http://java.sun.com/javase/6/docs/api/java/io/File.html

Change the Read and Write Permissions of a File in Java

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