First of all you need to know what is Fibonacci series? It is a series where next term is the sum of previous two terms. The first number of the series is 0 and 2nd number of the series is 1.

The Fibonacci series: 0, 1, 1, 2, 3, 5, 8, 13, 21, ...

In this example we are going to show two different ways of creating Fibonacci series. using for loop and by using while loop.

Display Fibonacci series using for loop

public class FibonacciSeries {

    public static void main(String[] args) {

        int num = 12, t1 = 0, t2 = 1;
        System.out.print("series of" + num + " terms: ");

        for (int i = 1; i <= num; ++i)
        {
            System.out.print(t1 + " + ");

            int sum = t1 + t2;
            t1 = t2;
            t2 = sum;
        }
    }
}

Output

series of 12 terms: 0 + 1 + 1 + 2 + 3 + 5 + 8 + 13 + 21 + 34 + 55 + 89 +

Above program prints the Fibonacci series for 12 terms where we defined 1st term as 0 and 2nd term as 1. We are iterating using for loop to and adding previous two terms.

Fibonacci series using while loop

public class FibonacciSeries {

    public static void main(String[] args) {

        int i = 1, n = 12, t1 = 0, t2 = 1;
        System.out.print("Series of " + n + " terms: ");

        while (i <= n)
        {
            System.out.print(t1 + " + ");

            int sum = t1 + t2;
            t1 = t2;
            t2 = sum;

            i++;
        }
    }
}

Output

Series of 12 terms: 0 + 1 + 1 + 2 + 3 + 5 + 8 + 13 + 21 + 34 + 55 + 89 +

The output of this program will be same, only thing is we have made use of while loop.

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