Fizz Buzz Program in Java

Introduction to the FizzBuzz Program

The FizzBuzz program in Java is a fun game that is used to print certain outputs like "Fizz", "Buzz", or "FizzBuzz" based on some conditions.

In this program, we are given a set of numbers, say, 1 to 20. We are supposed to check each number between 1 to 20 whether it is divisible by 3 or 5 or by both. Based on the results of this divisibility operation, we will print "Fizz" if the number is divisible by 3, "Buzz" if it is divisible by 5, and "FizzBuzz" if it is divisible by both 3 and 5.

Moreover, if the number does not satisfy any of the three conditions specified above, then we will print the number itself.

Example:

FizzBuzz Program in Java

There are several ways in which the FizzBuzz program in Java can be solved. Let us see them in detail.

Simple FizzBuzz Java Solution

In this program, we will run a loop from 1 to the number given by the user as the input, after which we will be checking the three conditions of the fizz buzz game on each number and print the result accordingly.

Let us see the code for a simple FizzBuzz program in Java.

Output: The output is given for n = $30$

The time complexity of the above solution will be O(N) as we are running a single loop to traverse the numbers whereas the space complexity of the above solution would be constant O(1) as we are not using any extra space in our program.

• Time Complexity: $O(N)$
• Space Complexity: $O(1)$

Using Java 8

In this method, we will be using IntStream Interface provided by Java 8. The IntStream Interface provides two methods that we will be used for solving the fizz buzz program in Java.

The first method is the rangeClosed() method which takes two parameters, a starting index and an ending index and generates the numbers between the starting and the ending index by incrementing each number by $1$. It is a static method.

Syntax:

The second method is the mapToObj() method which is discussed further.

Using mapToObj() Method

The second method is the mapToObj() method which returns an object-valued stream. This stream has the results obtained by applying the given conditions to the elements of this stream.

Syntax:

Now let us use these functions to solve our FizzBuzz program in Java.

Output: The output is given for n = $15$

In the above program, we have used the rangeClosed() method of IntStream Interface to traverse the numbers and the mapToObj() method to check the respective conditions on the stream of elements.

However, using the ternary operator in place of the if-else conditions has made our code shorter as compared to the previous one.

• Time Complexity: O(N)
• Space Complexity: O(N)