Java SecurityManager .checkAccess (ThreadGroup g)

public void checkAccess(ThreadGroup g)

//www . j  a  va2  s. c  o  m

public class Main extends SecurityManager {

   // check access needs to overriden
   @Override
   public void checkAccess(ThreadGroup a) {
      throw new SecurityException("Not allowed.");
   }

   public static void main(String[] args) {
      System.setProperty("java.security.policy", "file:/C:/java.policy");

      Main sm = new Main();

      System.setSecurityManager(sm);

      // check if accepting access for thread group is enabled
      sm.checkAccess(new ThreadGroup("example"));


      System.out.println("Allowed!");
   }
}