Help with programming a simple Java quiz?

I made a simple quiz in Java a while ago, but I have a little problem. Here is the code:

import java.util.Scanner;

public class ert {

public static void main(String[] args){

Scanner ian = new Scanner(System.in);

double aone;

double atwo;

double athree;

int bacon;

int cheese;

int lettuce;

int answer;

System.out.println("The Cool Test");

System.out.println("Answer 1 for yes and 2 for no.");

System.out.println("Question 1- Are you good at sports?");

aone = ian.nextDouble();

if(aone == 1)

bacon = 1;

else

bacon = 0;

System.out.println("Question 2- Are you good with computers?");

atwo = ian.nextDouble();

if(atwo == 1)

cheese = 1;

else

cheese = 0;

System.out.println("Question 3- Do you like Minecraft?");

athree = ian.nextDouble();

if(athree == 1)

lettuce = 1;

else

lettuce = 0;

answer = bacon + cheese + lettuce;

if(answer < 1){

System.out.println("You are super lame.");

}

if(answer == 1){

System.out.println("You are lame");

}

if(answer == 2){

System.out.println("You are kinda cool");

}

if(answer == 3){

System.out.println("You are cool. Nice job bro.");

}

}

}

It works fine as is, but how can I change this so the user inputs a 'yes' or 'no answer instead of '1' or '2'?

Thanks