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  4. Can You Access?
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Can You Access?

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137 Discussions

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  • osamabinazam
     + 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);

    `

  • ing_urirmz
     + 0 comments
    o = new Inner().new Private();
String powerOf2 = ((Inner.Private)o).powerof2(num);
System.out.println(num + " is " + powerOf2);

  • looney32768
     + 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.

  • alimglck5421
     + 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.

  • khuatducminh_t67
     + 0 comments

    My solution: 

    public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        
        Inner i = new Inner();
        Inner.Private ip = i.new Private();
        String assume = ip.powerof2(num) ? "is" : "is not a";
        
        System.out.printf("%d %s power of 2\n", num, assume);
        System.out.println("An instance of class: Solution.Inner.Private has been created");
    }
}

class Inner{
    class Private{
        boolean powerof2(int num){
            
            while(num > 1){
                if(num % 2 != 0) return false; //n = 2k+1
                num /= 2;
            }
            return true;
        }
    }
}