This community-built FAQ covers the “FizzBuzz” code challenge in Java. You can find that challenge here, or pick any challenge you like from our list.
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I struggled a bit before I realised that the order do matter in regards to “FizzBuzz”
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;
}
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;
I read that is not a good practice to use the Object type, so i used the String type for the ArrayList and converted the i variable into string before adding it to the ArrayList.
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
// declaring a new ArrayList, in which we will store the FizzBuzz game
ArrayList<String> fizzBuzz = new ArrayList<String>();
// using a for loop, in which we check if a number is multiple of 3, 5, both or neither
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 {
// converting int value i in a string and storing it in the ArrayList
String conv = String.valueOf(i);
fizzBuzz.add(conv);
}
}
return fizzBuzz;
}
}
I don’t think the order necessarily matters, at least mine works without checking for the FizzBuzz condition first. It just requires additional logic for each check:
public class FizzBuzz {
public static void main(String[] args) {
System.out.println(fizzbuzz(16));
}
public static ArrayList fizzbuzz(int n) {
ArrayList list = new ArrayList(n);
for (int i = 1; i <= n; i++) {
if ((i%3 == 0) && (i%5 != 0)) {
list.add("Fizz");
}
else if ((i%3 != 0) && (i%5 == 0)) {
list.add("Buzz");
}
else if ((i%3 ==0) && (i%5 == 0)) {
list.add("FizzBuzz");
}
else {
list.add(i);
}
}
return list;
}
}
I didn’t know I could use module for this challengue
import java.util.*;
public class FizzBuzz {
public static void main(String[] args) {
System.out.println(fizzbuzz(16));
}
public static ArrayList fizzbuzz(int n)
{
ArrayList Fizz = new ArrayList(n);
for (int k = 1; k <= n; k++) {
if (multiplo(k, n, 5) && multiplo(k, n, 3)){
Fizz.add("FizzBuzz");
} else if (multiplo(k, n, 5)) {
Fizz.add("Buzz");
} else if (multiplo(k, n, 3)) {
Fizz.add("Fizz");
} else {
Fizz.add(k);
}
}
return Fizz;
}
public static Boolean multiplo(int counter, int limit, int multiplier){
for (int i = 1; i <= limit; i++) {
int filter = multiplier * i;
if(counter == filter){
return true;
}
}
return false;
}
}
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