Can You Access? | HackerRank Solution

Hello coders, today we are going to solve Can You Access? HackerRank Solution in Java.

Problem

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 . You have to call the method powerof2 of the class Inner.Private from the main method of the class Solution.

Constraints

1 <= num <= 2³⁰

Sample Input

 8

Sample Output

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

Solution – Can You Access? in Java

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


public class Solution {

	public static void main(String[] args) throws Exception {
		DoNotTerminate.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
        System.out.println(num + " is " + ((Inner.Private) (o = new Inner().new Private())).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() {
            @Override
            public void checkPermission(Permission permission) {
                if (permission.getName().contains("exitVM")) {
                    throw new ExitTrappedException();
                }
            }
        };
        System.setSecurityManager(securityManager);
    }
}	

Disclaimer: The above Problem ( Can You Access? ) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.