Solution.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.security.Permission;

public class Solution {
    public static void main(String[] args) throws Exception {
        Do_Not_Terminate.forbidExit();

        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int num = Integer.parseInt(br.readLine().trim());
            Object o;// Must be used to hold the reference of the instance of
            // the class Solution.Inner.Private

            Inner inner = new Inner();
            Inner.Private p = inner.new Private();
            System.out.println(num + " is " + p.powerof2(num));
            o = p;

            System.out.println("An instance of class: " + o.getClass().getCanonicalName() + " has been created");

        } // end of try

        catch (Do_Not_Terminate.ExitTrappedException e) {
            System.out.println("Unsuccessful Termination!!");
        }
    }// end of main

    static class Inner {
        private class Private {
            private String powerof2(int num) {
                return ((num & num - 1) == 0) ? "power of 2" : "not a power of 2";
            }
        }
    }// end of Inner

}// end of Solution

class Do_Not_Terminate {

    public static class ExitTrappedException extends SecurityException {

        private static final long serialVersionUID = 1L;
    }

    public static void forbidExit() {
        final SecurityManager securityManager = new SecurityManager() {
            @Override
            public void checkPermission(Permission permission) {
                if (permission.getName().contains("exitVM")) {
                    throw new ExitTrappedException();
                }
            }
        };
        System.setSecurityManager(securityManager);
    }
}