Java.io.FilePermission.newPermissionCollection() 方法

package com.codingdict;



import java.io.FilePermission;

import java.io.IOException;

import java.security.PermissionCollection;



public class FilePermissionDemo {

   static FilePermission fp = null;

   static PermissionCollection pc = null;



   public static void main(String[] args) throws IOException {

      try {



         // create new file permissions

         fp = new FilePermission("C://test.txt", "read");



         // create new permission collection

         pc = fp.newPermissionCollection();



         // add permission to the permission collection

         pc.add(fp);



         // tests if the file permission is read

         TestFileReadPermission("C://test.txt");



      } catch(Exception ex) {



         // if an error occurs

         ex.printStackTrace();

      }

   } 



   // method to test file permission

   public static void TestFileReadPermission(String path) {

      if(pc.implies(new FilePermission("C://test.txt", "read"))) {

         System.out.println("Permission for "+path+" is read");

      }

   }

}