JavaProgramming/HackerRank/ThirtyNine.java at main · karterhhgg/JavaProgramming · GitHub

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package HackerRank;

import java.io.*;

import java.lang.reflect.*;

import java.util.*;

import java.util.regex.*;

import java.security.*;

public class ThirtyNine {

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

Inner innerInstance = new Inner();

// Create an instance of the Private inner class via the outer class instance

Inner.Private privateInstance = innerInstance.new Private();

// Call the powerof2 method

String result = privateInstance.powerof2(num);

// Print the result

System.out.println(num + " is " + result);

// Create the reference for 'o' to hold the Private class instance

o = privateInstance;

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);

}

JavaProgramming/HackerRank/ThirtyNine.java at main · karterhhgg/JavaProgramming · GitHub

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