java - Loading an Array from another Array -

it doesn't seem work properly

'

   public class junk {  public static void main(string[] args){   int[] arr = {1,0,1,1,0,1,0}; int[] newarr = null;     for(int = 0; < arr.length; i++){   if(ispoweroftwo(i)) {      newarr[i] = 9;   }    else{    newarr[i] = arr[i];     } }   (int = 0; < newarr.length; i++) {    system.out.print(newarr[i] + ", "); } }     private static boolean ispoweroftwo(int i) {     if (i <= 0) {         throw new illegalargumentexception("number: " + i);     }     if ((i & -i) == i) {         return true;     }     return false;  } 

}

'

an array 10011010 of this, , want 9 9 1 9 0 0 1 9 1 0 1 0

so power of 2 indices should filled 9's getting right?

how load data of bits in array or arraylist loop , indices 9... want 1st,2nd, 4th , 8th indices...

_ _ 1 _ 0 0 1 _ 1 0 1 0

issue in ispoweroftwo() method

• i <= 0 throwing exception , want place 9 @ 0th index.

secondly haven't initialized array.

int[] newarr = new int[10];  

otherwise throw nullpointerexception

want 1st,2nd, 4th , 8th indices...

try following condition in ispoweroftwo() method.

if (i == 1) {     return true; } else if (i%2==0 && i%3!=0) {     return true; } 

---

for array

int[] arr = {1,0,1,1,0,1,0,1,0,1}; 

it give you.

1,9,9,1,9,1,0,1,9,1   ^ ^   ^       ^   1 2   4       8