Can You Access Java HackerRank Solution

Hello Friends, How are you? Today I will solve the HackerRank Java Can You Access - Problem with a straightforward explanation. In this article, you will get more than one approach to solve this problem. So let's start-

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HackerRank Java Can You Access - Problem Statement

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.

Constraints:

1 <= num <= 2^30

Sample Input

8 {codeBox}

Sample Output

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

Java Can You Access HackerRank Solution

Java Can You Access - Hacker Rank Solution

Approach I: Java Can You Access - Solution HackerRank

// ========================
//       Information
// ========================

// Name: Java Can You Access HackerRank Problem
// Direct Link: https://www.hackerrank.com/challenges/can-you-access/problem
// Difficulty: Medium
// Max Score: 15
// Language: Java 7

// ========================
//         Solution Start
// ========================

// Java Can You Access - Hacker Rank Solution Start

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
            
            o = new Inner().new Private();
System.out.println(""+num+" is "+((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() {
            @Override
            public void checkPermission(Permission permission) {
                if (permission.getName().contains("exitVM")) {
                    throw new ExitTrappedException();
                }
            }
        };
        System.setSecurityManager(securityManager);
    }
}

// Java Can You Access Hacker Rank Solution END
// MyEduWaves

Approach II: Java Can You Access - Solution HackerRank

// ========================
//       Information
// ========================

// Name: Java Can You Access HackerRank Problem
// Direct Link: https://www.hackerrank.com/challenges/can-you-access/problem
// Difficulty: Medium
// Max Score: 15
// Language: Java 7

// ========================
//         Solution Start
// ========================

// Java Can You Access - Hacker Rank Solution Start

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);
	}
}

// Java Can You Access Hacker Rank Solution END
// MyEduWaves

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I hope you have understood the solution to this HackerRank Problem. All these three solutions will pass all the test cases. Now visit Java Can You Access - Hackerrank Problem and try to solve it again.

All the Best!

Can You Access Java HackerRank Solution