Java Program to Print Fibonacci Series

The Fibonacci series is a sequence in which each number is the sum of the two preceding ones. It is a popular programming problem used to teach loops and recursion in Java.

In this tutorial, we will create a Java program to generate the Fibonacci series up to a given number of terms.

By the end of this guide, you will understand how iterative logic is used to build sequences in Java.

Concept Overview

The Fibonacci series starts with 0 and 1. Each subsequent number is the sum of the previous two numbers.

Example: 0, 1, 1, 2, 3, 5, 8, 13, ...

Program

import java.util.Scanner;

public class FibonacciSeries {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of terms: ");
        int n = sc.nextInt();

        int first = 0, second = 1;

        System.out.print("Fibonacci Series: ");

        for (int i = 1; i <= n; i++) {
            System.out.print(first + " ");
            int next = first + second;
            first = second;
            second = next;
        }
    }
}

Output

Enter number of terms: 7
Fibonacci Series: 0 1 1 2 3 5 8

Detailed Explanation

The program begins by importing the Scanner class for user input.

Two variables, first and second, are initialized to 0 and 1 respectively.

The loop runs n times, printing the current number and calculating the next number.

Each new term is generated by adding the previous two terms.

Example Walkthrough

Let us consider n = 7.

The series generated is: 0 → 1 → 1 → 2 → 3 → 5 → 8.

Applications

Fibonacci series is used in algorithm design, dynamic programming, financial modeling, and computer graphics.

Advantages of This Approach

This program helps beginners understand loops and sequence generation.

It demonstrates how variables change dynamically during execution.

Limitations

The program is not optimized for very large values of n.

Improvements You Can Make

You can implement recursion to generate the series.

You can also use memoization for better performance.

This Java program provides a strong foundation in iterative problem solving and sequence generation.