Java Challenge - FizzBuzz

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import java.util.*;

public class FizzBuzz {
public static void main(String args) {
System.out.println(fizzbuzz(16));
}

public static ArrayList fizzbuzz(int n)
{
// Write your code here
ArrayList arr = new ArrayList();

for(int i = 1; i <= n; i++)
{
  if(i % 3 == 0 && i % 5 == 0)
  {
    arr.add("FizzBuzz");
  }

  else if(i % 3 == 0)
  {
    arr.add("Fizz");
  }

  else if(i % 5 == 0)
  {
    arr.add("Buzz");
  }

  else
  {
    arr.add(i);
  }
}

return arr;

}
}

I struggled a bit before I realised that the order do matter in regards to “FizzBuzz” :slight_smile:

public static ArrayList fizzbuzz(int n)
{
    ArrayList<Object> fizzBuzz = new ArrayList<Object>();

    // Looping from 1 -> n
    for (int i = 1; i <= n; i++) {

        // It's important to check FizzBuzz first else you only get buzz or fizz added to the ArrayList. The order matters!
        if (((i % 3) == 0) && ((i % 5) == 0)) {
            fizzBuzz.add("FizzBuzz");
        } else if ((i % 5) == 0) {
            fizzBuzz.add("Buzz");
        } else if ((i % 3) == 0) {
            fizzBuzz.add("Fizz");
        } else {
            fizzBuzz.add(i);
        }
    }

    return fizzBuzz;
}

}

1 Like

I agree that the order matters. As per the challenge this is what they look for.

class FizzBuzz{

public static void main (String args){

for(int i = 1; i <= 100; i++){

if(((i % 5) == 0) && ((i % 3)== 0)){

System.out.println("FizzBuzz");

}else if((i % 5) == 0){

System.out.println("Buzz");

}else if((i % 3) == 0){

System.out.println("Fizz");

}else

System.out.println(i);

}

}

}

public static ArrayList fizzbuzz(int n) {
ArrayList arr = new ArrayList<>();

for(int i = 1; i<= n; i++){
  if(i % 15 ==0){
    arr.add("FizzBuzz");
  } 
  else if(i % 3 == 0){
    arr.add("Fizz");
  } 
  else if(i % 5 ==0){
    arr.add("Buzz");
  } else arr.add(i);

}
  return arr;

}
}

I tried to do the task without googling so having forgotten the syntax of the FOR loop or a STREAM I went with a WHILE:

import java.util.*;

public class FizzBuzz {
  public static void main(String[] args) {
    System.out.println(fizzbuzz(16));
  }

  public static ArrayList fizzbuzz(int n) 
  {
        int i = 1;

        ArrayList result = new ArrayList();

        while (i <= n) {
            if ((i % 5) == 0 && (i % 3) == 0) {
                result.add("FizzBuzz");
            } else if ((i % 3) == 0) {
                result.add("Fizz");
            } else if ((i % 5) == 0) {
                result.add("Buzz");
            } else {
                result.add(i);
            }
            i++;
        }
        return result;
  }
}

InteliJ and Google really do help you to forget stuff.

If I had remembered STREAMs and if it was allowed I might have tried this:

        ArrayList result = new ArrayList();

        IntStream.rangeClosed(1, n)
                .mapToObj(i -> i % 5 == 0 ? (i % 3 == 0 ? "FizzBuzz" : "Buzz") : (i % 3 == 0 ? "Fizz" : i))
                .forEach(result::add);

        return result;

This has been a nice challenge. And yes, the order matters. :slight_smile:

public class FizzBuzz{

public static void main(String args){

for (int i=1; i <=100; i++) {
  if (i % 3 == 0 && i % 5 == 0){
    System.out.println("FizzBuzz");
    i++;
  } if (i % 3 == 0){
    System.out.println("Fizz");
    i++;
    } if (i % 5 == 0){
    System.out.println("Buzz");
    } else {
    System.out.println(i);
    continue;
    } 
  }
} 

}

1 Like

Finally, I did it!

import java.util.*;

public class FizzBuzz {
  public static void main(String[] args) {
    System.out.println(fizzbuzz(16));
  }

  public static ArrayList fizzbuzz(int n) {
    ArrayList<Object> fizzbuzz = new ArrayList<Object>();
    for(int i = 1; i <= n; i++) {
      if (i % 3 == 0 && i % 5 == 0) {
        fizzbuzz.add("FizzBuzz");
      }else if (i % 3 == 0) {
        fizzbuzz.add("Fizz");
      }else if (i % 5 == 0) {
        fizzbuzz.add("Buzz");
      }else{ 
        fizzbuzz.add(i);
      }
    } return fizzbuzz;
    }
}

This was my go with using ternaries.

import java.util.*;

public class FizzBuzz {
  public static void main(String[] args) {
    System.out.println(fizzbuzz(16));
  }

 public static ArrayList fizzbuzz(int n) 
  {
    ArrayList<Object> arr = new ArrayList<Object>();
    for(int i = 1; i<=n; i++){
      arr.add(
        i%15 == 0 ? "FizzBuzz" 
          : i%3 == 0 ? "Fizz" 
            : i%5 == 0 ? "Buzz" 
              : i
      );
    }
    return arr;
  }
}
import java.util.*;

public class FizzBuzz {
  public static void main(String[] args) {
    System.out.println(fizzbuzz(16));
  }

  public static ArrayList fizzbuzz(int n) 
  {
    ArrayList<Object> array = new ArrayList<>();
    // Write your code here
    for(int a  = 1; a <= n; a++){
      if(a%3 == 0 && a%5 == 0){
array.add("FizzBuzz");
      }else if(a%5 == 0){
array.add("Buzz");
      }else if(a%3 == 0){
        array.add("Fizz");
      }else{
array.add(a);
      }
    }
    return array;
  }
}

import java.util.*;

public class FizzBuzz {
public static void main(String args) {
System.out.println(fizzbuzz(16));
}

public static ArrayList fizzbuzz(int n)
{
// Write your code here
ArrayList res = new ArrayList<>();
for(int i=1;i<=n;i++){
if(i%3==0&&i%5==0)
res.add(“FizzBuzz”);
else if(i%3==0)
res.add(“Fizz”);
else if(i%5==0)
res.add(“Buzz”);
else
res.add(i);
}
return res;
}
}

I am a bit confused by this challenge because my teacher used to say that it is not really a good idea to use an ArrayList for example with Object type. Normally we should specify the data type, in this case for example I wanted to use String at first, since Integers can also be converted to String easily, but after seeing the tests fail, I changed my code.

import java.util.*;
import java.util.ArrayList;

public class FizzBuzz {
public static void main(String args) {
System.out.println(fizzbuzz(16));
}

public static ArrayList fizzbuzz(int n)
{
ArrayList numbers = new ArrayList<>();
for (int i = 1; i <= n; i++) {
boolean isDivisibleByFive=i%5==0;
boolean isDivisibleByThree=i%3==0;

        if(isDivisibleByFive&&isDivisibleByThree){
            numbers.add("FizzBuzz");
        }else if(isDivisibleByThree){
            numbers.add("Fizz");
        }else if(i%5==0){
            numbers.add("Buzz");
        }else{
            numbers.add(i);
        }
    }
    return numbers;

}
}

Solution with 3 ifs instead of 4!

import java.util.*;

public class FizzBuzz {

  public static void main(String[] args) {
    System.out.println(fizzbuzz(16));
  }

  public static ArrayList fizzbuzz(int n) {

    ArrayList<Object> numbers = new ArrayList<>();

    for(int i = 1; i <= n; i++){

        if(i % 3 != 0 && i % 5 != 0){
          numbers.add(i);
          continue;
        }
        String fizzbuzz = "";

        if(i % 3 == 0){
          fizzbuzz += "Fizz";
        }

        if(i % 5 == 0){
          fizzbuzz += "Buzz";
        }
        numbers.add(fizzbuzz);
    }
    return numbers;
  }
}