# 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.

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{
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.