# fibonacci series program in java with code examples

The Fibonacci series is a sequence of numbers starting with 0 and 1, in which each number is the sum of the two preceding numbers. In other words, the series goes as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on.

In Java, we can write a program that generates the Fibonacci series using various techniques. In this article, we will learn how to write the Fibonacci series program in Java using different logic and coding examples.

Method 1: Using Recursion

Recursion is a technique in which a function calls itself repeatedly until a base condition is met. We can use recursion to generate the Fibonacci series as well.

Let's see how to use recursion to generate the Fibonacci series in Java:

```public class FibonacciSeries {

public static void main(String[] args) {
int n = 10;
for (int i = 0; i < n; i++) {
System.out.print(fibonacci(i) + " ");
}
}

public static int fibonacci(int n) {
if (n == 0 || n == 1) {
return n;
} else {
return fibonacci(n-1) + fibonacci(n-2);
}
}
}
```

In the above program, we have used a recursive function called `fibonacci()` to generate the Fibonacci series. The function takes an integer n as an argument and returns the nth Fibonacci number. If n is equal to 0 or 1, it returns n. Otherwise, it calls itself recursively to calculate the sum of the two preceding numbers (n-1 and n-2). Finally, the main function calls `fibonacci()` function in a loop to generate the Fibonacci series.

Method 2: Using Loop

Another way to generate the Fibonacci series is to use a loop. We can use a `for` loop to iterate through the series and calculate the sum of the two preceding numbers.

Let's see how to use a loop to generate the Fibonacci series in Java:

```public class FibonacciSeries {

public static void main(String[] args) {
int n = 10, first = 0, second = 1;
System.out.print(first + " " + second + " ");
for (int i = 2; i < n; i++) {
int next = first + second;
System.out.print(next + " ");
first = second;
second = next;
}
}
}
```

In the above program, we have used a `for` loop to iterate through the series. Initially, we have assigned the first and second numbers of the series to the variables `first` and `second`. Then, we have printed these two values. In the loop, we have calculated the next number in the series by adding the values of `first` and `second`. We have printed this next value and assigned the value of `second` to `first` and the value of `next` to `second` for the next calculation.

Method 3: Using Arrays

We can also use arrays to generate the Fibonacci series. We can create an array of integers and store the Fibonacci numbers in it by calculating the sum of the two preceding numbers.

Let's see how to use arrays to generate the Fibonacci series in Java:

```public class FibonacciSeries {

public static void main(String[] args) {
int n = 10;
int[] fibonacci = new int[n];
fibonacci = 0;
fibonacci = 1;
for (int i = 2; i < n; i++) {
fibonacci[i] = fibonacci[i-1] + fibonacci[i-2];
}
for (int i = 0; i < n; i++) {
System.out.print(fibonacci[i] + " ");
}
}
}
```

In the above program, we have created an array of integers called `fibonacci` with a size of `n`. Then, we have initialized the first two values of the array to 0 and 1. In the loop, we have calculated the sum of the two preceding values and assigned it to the next value in the array. Finally, we have printed the values of the array using another loop.

Conclusion:

In this article, we have learned how to write the Fibonacci series program in Java using different logic and coding examples. Depending on the requirement and use case, we can choose any of the above methods to generate the Fibonacci series. Recursion is useful when we need to generate a single Fibonacci number, while loop and arrays are useful when we need to generate the entire series.

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## Popular questions

Sure, here are some questions and answers related to the topic of Fibonacci series program in Java:

Q1. What is the Fibonacci series?

A1. The Fibonacci series is a sequence of numbers starting with 0 and 1, in which each number is the sum of the two preceding numbers. In other words, the series goes as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on.

Q2. How can you generate the Fibonacci series using recursion in Java?

A2. We can generate the Fibonacci series using recursion in Java by defining a recursive function called `fibonacci()` that takes an integer n as an argument and returns the nth Fibonacci number. If n is equal to 0 or 1, it returns n. Otherwise, it calls itself recursively to calculate the sum of the two preceding numbers (n-1 and n-2). Finally, we can call this function in a loop to generate the Fibonacci series.

Q3. How can you generate the Fibonacci series using a loop in Java?

A3. We can generate the Fibonacci series using a loop in Java by initializing two variables to 0 and 1, respectively, and then using a `for` loop to iterate through the series and calculate the sum of the two preceding numbers. We can print each value of the series as we calculate it.

Q4. How can you generate the Fibonacci series using arrays in Java?

A4. We can generate the Fibonacci series using arrays in Java by creating an array of integers with a size of n and initializing the first two values of the array to 0 and 1. Then, we can use a `for` loop to iterate through the array and calculate the sum of the two preceding values and assign it to the next value in the array. Finally, we can print the values of the array to display the entire Fibonacci series.

Q5. Which method is the best to generate the Fibonacci series in Java and why?

A5. The best method to generate the Fibonacci series in Java depends on the requirement and use case. Recursion is useful when we need to generate a single Fibonacci number whereas a loop and arrays are useful when we need to generate the entire series. Recursion can be less efficient for generating longer sequences due to its exponential time complexity; however, it is more concise and easier to understand. Loops and arrays are more efficient for longer sequences due to their linear time complexity, but the code can be longer and more complex to understand. Ultimately, it is up to the programmer to decide which method to use based on their specific needs.

### Tag

Programming ##### Deeksha Sudhakar
As a seasoned software engineer, I bring over 7 years of experience in designing, developing, and supporting Payment Technology, Enterprise Cloud applications, and Web technologies. My versatile skill set allows me to adapt quickly to new technologies and environments, ensuring that I meet client requirements with efficiency and precision. I am passionate about leveraging technology to create a positive impact on the world around us. I believe in exploring and implementing innovative solutions that can enhance user experiences and simplify complex systems. In my previous roles, I have gained expertise in various areas of software development, including application design, coding, testing, and deployment. I am skilled in various programming languages such as Java, Python, and JavaScript and have experience working with various databases such as MySQL, MongoDB, and Oracle.
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