File Permissions in java

The Java.io.FilePermission class represents access to a file or directory. It consists of a pathname and a set of actions valid for that pathname. Following are the important points about File Permission −

• The actions to be granted are passed to the constructor in a string containing a list of one or more comma-separated keywords. The possible keywords are "read", "write", "execute", and "delete".
• The code can always read a file from the same directory it's in (or a subdirectory of that directory); it does not need explicit permission to do so.

Program

The java.io.FileOutputStream implies(Permission p) method tests if this FilePermission object "implies" the specified permission.

Live Demo

import java.io.FilePermission;
import java.io.IOException;

public class FilePermissionDemo {
   public static void main(String[] args) throws IOException {
      FilePermission fp = null;
      FilePermission fp1 = null;
      FilePermission fp2 = null;
      FilePermission fp3 = null;
      boolean bool = false;
      try {
         // create new file permissions
         fp = new FilePermission("C://test.txt", "read");
         fp1 = new FilePermission("C://test.txt", "write");
         fp2 = new FilePermission("C://test1.txt", "read");
         fp3 = new FilePermission("C://test.txt", "read");
         
         // tests if implied by this object
         bool = fp.implies(fp1);
         
         // print
         System.out.println(bool);
         bool = fp.implies(fp2);
         System.out.println(bool);
         bool = fp.implies(fp3);
         System.out.print(bool);
      } catch(Exception ex) {
         // if an error occurs
         ex.printStackTrace();
      }
   }
}

Output

false
false
true