# Java Tutorial Through Katas: Fizz Buzz (Easy)

A programming kata is an exercise which helps a programmer hone his skills through practice and repetition.

Fizz Buzz (Easy) - Java 7
Berlin Clock (Easy) - Java 7 and 8
Tennis Game (Easy) - Java 7
Reverse Polish Notation (Medium) - Java 7 and 8

The article assumes that the reader already has experience with Java, that he is familiar with the basic usage of JUnit tests and that he knows how to run them from his favorite IDE (ours is IntelliJ IDEA).

Tests that prove that the solution is correct are displayed below. Recommended way to solve this kata is to use test-driven development approach (write the implementation for the first test, confirm that it passes and move to the next). Once all of the tests pass, the kata can be considered solved.

One possible solution is provided below the tests. Try to solve the kata by yourself first.

# Fizz Buzz

Return "fizz", "buzz" or "fizzbuzz".

For a given natural number greater than zero return:

• "fizz" if the number is dividable by 3
• "buzz" if the number is dividable by 5
• "fizzbuzz" if the number is dividable by 15
• the same number if no other requirement is fulfilled

[TESTS]

```public class FizzBuzzTest {

@Test
public void getResultShouldReturnFizzIfTheNumberIsDividableBy3() {
Assert.assertEquals("fizz", FizzBuzz.getResult(3));
}

@Test
public void getResultShouldReturnBuzzIfTheNumberIsDividableBy5() {
Assert.assertEquals("buzz", FizzBuzz.getResult(5));
Assert.assertEquals("buzz", FizzBuzz.getResult(10));
}

@Test
public void getResultShouldReturnBuzzIfTheNumberIsDividableBy15() {
Assert.assertEquals("fizzbuzz", FizzBuzz.getResult(15));
Assert.assertEquals("fizzbuzz", FizzBuzz.getResult(30));
}

@Test
Assert.assertEquals("1", FizzBuzz.getResult(1));
Assert.assertEquals("2", FizzBuzz.getResult(2));
Assert.assertEquals("4", FizzBuzz.getResult(4));
}

}```

Test code can be found in the GitHub FizzBuzzTest.java.

[ONE POSSIBLE SOLUTION]

```public class FizzBuzz {

public static String getResult(int number) {
if (number % 15 == 0) return "fizzbuzz";
else if (number % 3 == 0) return "fizz";
else if (number % 5 == 0) return "buzz";
return Integer.toString(number);
}

}```

Java solution code can be found in the FizzBuzz.java solution.

What was your solution? Post it as a comment so that we can compare different ways to solve this kata.

# Test-Driven Java Development Test-Driven Java Development book wrote by Alex Garcia and me has been published by Packt Publishing. It was a long, demanding, but very rewarding journey that resulted in a very comprehensive hands-on material for all Java developers interested in learning or improving their TDD skills.

If you liked this article I am sure that you'll find this book very useful. It contains extensive tutorials, guidelines and exercises for all Java developers eager to learn how to successfully apply TDD practices.

## 5 thoughts on “Java Tutorial Through Katas: Fizz Buzz (Easy)”

1. robin

You should try to have a solution without if/cases … tip: use streams!

2. christopherkerr

Ternary Operators for the win 🙂

3. Rafal

Try to refactor into the “chain of responsibility” pattern.

4. Pradip

Above code is correct but what about the below scenario
if there are some number which are divided by all these three number(3 , 5 , 15)
then what should be the output . i means if we pass input as a 30 then 3 , 5 ,15 all
these numbers are divided by 30 then what should be the expected output.

1. Viktor Farcic

In case of 30 as input, the result should be fizzbuzz since it’s dividable by both 3 and 5.