Java coin flip multiple increment trial example

// any shortcomings or problems would be appreciated

import java.util.Scanner;

public class CoinTurn {
 private static int[] intCoins;
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  int coinNum = inputNum();
  intCoins = new int[coinNum];
  
  for (int i = 0; i < intCoins.length; i++) {
   intCoins[i] = 0;//Initialize all the way down, which is tails 0
  }
  doTurnCoin();
  int resutltCoin = getCoinNum();
  System.out.println("result coin about 1 nums = " + resutltCoin);//Output the final number of heads up
 }
 private static void doTurnCoin() {
  
  for (int i = 1; i < intCoins.length; i++) {//Determine the multiple
   for (int j = i - 1; j < intCoins.length; j++) {//Cyclic reverse
    if (j % i == 0) { //If the number of COINS is a multiple of the current number, flip it
     if (intCoins[j] == 0) {
      intCoins[j] = 1;
     } else {
      intCoins[j] = 0;
     }
    }
   }
  }
 }
 private static int getCoinNum() {
  int countNum = 0;//Record the final number of heads
  StringBuffer strB = new StringBuffer();
  for (int a : intCoins) {
   strB.append(a + "");
   if (1 == a)
    countNum++;
  }
  System.out.println("int[] ==  " + strB);//Output the result of the array
  return countNum;
 }
 
 private static int inputNum() {
  System.out.println("input coin num: ");
  Scanner input = new Scanner(System.in);
  return input.nextInt();
 }
}