Discussion on Can You Access? Challenge

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3 weeks ago+ 0 comments

what is wrong with my solutions?

import java.io.*;
import java.util.*;

public class Solution {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int num=sc.nextInt();
        int a=0;
        if((num>0)&&(num&(num-1))==0){
            System.out.printf("%d is power of %d",num,2);
        }
        else{System.out.printf("%d is not power of %d\n",num,2);
        System.out.print("An instance of class: Solution.Inner.Private has been created");
        }

        }
}

5 months ago+ 0 comments

I came to the solution by adding the following lines to use Java reflection and access the private powerof2 method in Solution.Inner.Private:

Solution.Inner inner = new Solution.Inner();
Solution.Inner.Private innerPrivate = inner.new Private();
o = innerPrivate;
Method method = innerPrivate.getClass().getDeclaredMethod("powerof2", int.class);
method.setAccessible(true); 
String result = (String) method.invoke(o, num); 
System.out.println(num + " is " + result);

6 months ago+ 0 comments

o = new Inner().new Private();
String powerOf2 = ((Inner.Private)o).powerof2(num);
System.out.println(num + " is " + powerOf2);

8 months ago+ 0 comments

The task description is very vague. Only by reading Editorial section I learned that we are supposed to use reflection to call the method of inner class.

[deleted] 10 months ago+ 0 comments

For JAVA 8

Inner x = new Inner();
  o = x.new Private();
    Inner.Private y = (Inner.Private) o;
System.out.println(num+" is "+ y.powerof2(num));

Just write it to the area that is shown us.

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