java.lang.Integer.bitCount()

package com.codingdict;



import java.lang.*;



public class IntegerDemo {



   public static void main(String[] args) {



      int i = 177;

      System.out.println("Number = " + i);



      /* returns the string representation of the unsigned integer value 

         represented by the argument in binary (base 2) */

      System.out.println("Binary = " + Integer.toBinaryString(i));



      // returns the number of one-bits 

      System.out.println("Number of one bits = " + Integer.bitCount(i)); 

   }

}