Java tutorial
import java.util.BitSet; public class Main { public static void main(String[] args) { BitSet bs = new BitSet(); bs.set(31); bs.set(15); bs.set(18); int[] intArray = bits2Ints(bs); for (int i = 0; i < intArray.length; i++) System.out.println(toBinary(intArray[i])); } static int[] bits2Ints(BitSet bs) { int[] temp = new int[bs.size() / 32]; for (int i = 0; i < temp.length; i++) for (int j = 0; j < 32; j++) if (bs.get(i * 32 + j)) temp[i] |= 1 << j; return temp; } static String toBinary(int num) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < 32; i++) { sb.append(((num & 1) == 1) ? '1' : '0'); num >>= 1; } return sb.reverse().toString(); } }