Problem Name: Can You Access?

Problem Link:

In this HackerRank Functions in Java programming problem solution,

You are given a class Solution and an inner class Inner.Private. The main method of class Solution takes an integer num as input. The powerof2 in class Inner.Private checks whether a number is a power of 2 . You have to call the method powerof2 of the class Inner.Private from the main method of the class Solution.


1 <= num <= 2 power 30

Sample Input


Sample Output

8 is power of 2
An instance of class: Solution.Inner.Private has been created



Code Examples

#1 Code Example with Java Programming

Code - Java Programming

import java.lang.reflect.*;
import java.util.*;
import java.util.regex.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(;
            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
            o = new Inner().new Private();
            System.out.println(num + " is " + ((Solution.Inner.Private) o).powerof2(num));
            System.out.println("An instance of class: " + o.getClass().getCanonicalName() + " has been created");
        } // end of try
        catch (DoNotTerminate.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 DoNotTerminate { // This class prevents exit(0)
    public static class ExitTrappedException extends SecurityException {
        private static final long serialVersionUID = 1L;
    public static void forbidExit() {
        final SecurityManager securityManager = new SecurityManager() {
            public void checkPermission(Permission permission) {
                if (permission.getName().contains("exitVM")) {
                    throw new ExitTrappedException();
Copy The Code & Try With Live Editor


[Solved] Java Priority Queue in Java solution in Hackerrank - Hacerrank solution Java
[Solved] Prime Checker in Java solution in Hackerrank - Hacerrank solution Java