Java Program to Display Fibonacci Series

In this post we will explore how to generate Fibonacci Series in java and understand the logic behind it.

Fibonacci Series:

In Fibonacci series, the next number is the sum of previous two numbers.
for example 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 etc.

Solutions:

There are two ways to display Fibonacci series in java

• Fibonacci series using loop.
• Fibonacci series using recursion.

Approach 1 : Fibonacci series using loop.

class FibonacciSeries {
    public static void main(String[] args) {
        int n = 10; 
        int num1 = 0; 
        int num2 = 1;
        System.out.print("Fibonacci Series of " + n + " numbers:");

        for (int i = 1; i <= n; ++i) {
            System.out.print(num1 + " ");

            int sum = num1 + num2;
           num1 = num2;
           num2 = sum;
        }
    }
}

Output:

Fibonacci Series of 10 numbers:0 1 1 2 3 5 8 13 21 34

Approach 1 : Fibonacci series using recursion

class Fibonacci {
    static int fib(int n) {
        if (n <= 1)
            return n;
        return fib(n - 1) + fib(n - 2);
    }

    public static void main(String[] args) {
        int n = 10;
        System.out.print("Fibonacci Series of " + n + " numbers:");

        for (int i = 0; i < n; i++) {
            System.out.print(fib(i) + " ");
        }
    }
}

Output:

Fibonacci Series of 10 numbers:0 1 1 2 3 5 8 13 21 34

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