Java Program to Find the Fibonacci Series

Introduction

The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones, typically starting with 0 and 1. The series begins as follows: 0, 1, 1, 2, 3, 5, 8, 13, and so on. The Fibonacci series has numerous applications in computer science, mathematics, and finance. This guide will walk you through writing a Java program that generates the Fibonacci series up to a specified number of terms.

Problem Statement

Create a Java program that:

• Prompts the user to enter the number of terms in the Fibonacci series.
• Generates and displays the Fibonacci series up to the specified number of terms.

Example:

• Input: 7
• Output: "0, 1, 1, 2, 3, 5, 8"

Solution Steps

1. Read the Number of Terms: Use the Scanner class to take the number of terms as input from the user.
2. Generate the Fibonacci Series: Use a loop to generate the Fibonacci series.
3. Display the Fibonacci Series: Print the series up to the specified number of terms.

Java Program

// Java Program to Find the Fibonacci Series // Author: https://www.rameshfadatare.com/ import java.util.Scanner; public class FibonacciSeries { public static void main(String[] args) { // Step 1: Read the number of terms from the user try (Scanner scanner = new Scanner(System.in)) { System.out.print("Enter the number of terms: "); int terms = scanner.nextInt(); // Step 2: Generate the Fibonacci series System.out.print("Fibonacci Series: "); generateFibonacciSeries(terms); } } // Method to generate Fibonacci series public static void generateFibonacciSeries(int terms) { int first = 0, second = 1; for (int i = 1; i <= terms; i++) { System.out.print(first + " "); // Calculate the next number in the series int next = first + second; first = second; second = next; } } } 

Explanation

Step 1: Read the Number of Terms

• The Scanner class is used to read an integer input from the user, which represents the number of terms in the Fibonacci series. The nextInt() method captures this input.

Step 2: Generate the Fibonacci Series

• The generateFibonacciSeries() method generates the Fibonacci series up to the specified number of terms.
• The method starts with the first two numbers in the series, first = 0 and second = 1.
• A loop runs terms times, printing the current number and calculating the next number in the series as the sum of the previous two numbers.

Step 3: Display the Fibonacci Series

• The Fibonacci series is printed in sequence using System.out.print() inside the loop.

Output Example

Example:

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

Conclusion

This Java program demonstrates how to generate and display the Fibonacci series up to a specified number of terms. It covers essential concepts such as loops, basic arithmetic operations, and user input handling, making it a valuable exercise for beginners learning Java programming.