Java program to print the Fibonacci series up to n terms- top 100 Java Programs solution

Java program to print the Fibonacci series- The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1. The sequence commonly starts as 0, 1, 1, 2, 3, 5, 8, and so on. Printing the Fibonacci series up to n terms is a common exercise in programming to understand loops and sequences.

Java Program to Print Fibonacci Series up to n Terms

Here’s a Java program that prompts the user to enter the number of terms n and then prints the Fibonacci series up to n terms.

Java program to print the Fibonacci series

import java.util.Scanner;

public class FibonacciSeries {
    public static void main(String[] args) {
        // Create a Scanner object to read input from the user
        Scanner scanner = new Scanner(System.in);

        // Prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = scanner.nextInt();

        // Print the Fibonacci series up to n terms
        System.out.println("Fibonacci series up to " + n + " terms:");
        
        for (int i = 0; i < n; i++) {
            System.out.print(fibonacci(i) + " ");
        }
    }

    // Method to calculate the Fibonacci number at a given position using recursion
    public static int fibonacci(int n) {
        if (n <= 1) {
            return n;
        } else {
            return fibonacci(n - 1) + fibonacci(n - 2);
        }
    }
}

Explanation of the Code:- Java program to print the Fibonacci series

Let’s break down the program step-by-step to understand how it works.

1. Importing the Scanner Class: We import the Scanner class from the java.util package to read input from the user.

import java.util.Scanner;

2. Creating the Main Class: We create a public class named FibonacciSeries. In Java, the class name should match the filename.

public class FibonacciSeries {

3. Main Method: The main method is the entry point of the program. Inside this method, we will write the code to print the Fibonacci series.

public static void main(String[] args) {

4. Creating a Scanner Object: We create a Scanner object to read input from the user.

Scanner scanner = new Scanner(System.in);

5. Reading Input from the User: We prompt the user to enter the number of terms n and store this value in a variable.

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

6. Printing the Fibonacci Series: We use a for loop to print the Fibonacci series up to n terms. The fibonacci method is called for each term to calculate its value.

System.out.println("Fibonacci series up to " + n + " terms:");
for (int i = 0; i < n; i++) {
    System.out.print(fibonacci(i) + " ");
}

7. Method to Calculate Fibonacci Number: The fibonacci method calculates the Fibonacci number at a given position using recursion. If the position n is 0 or 1, it returns n. Otherwise, it returns the sum of the Fibonacci numbers at positions n-1 and n-2.

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

Running the Program

To run the program, follow these steps:

1. Save the code in a file named FibonacciSeries.java.
2. Open a command prompt or terminal and navigate to the directory where you saved the file.
3. Compile the program using the following command:

javac FibonacciSeries.java

4. Run the compiled program using the following command:

java FibonacciSeries

5. Follow the prompt to enter the number of terms. The program will display the Fibonacci series up to the specified number of terms.

Example Output:- Java program to print the Fibonacci series

If you run the program and enter 10 as the number of terms, the output will be:

Enter the number of terms: 10
Fibonacci series up to 10 terms:
0 1 1 2 3 5 8 13 21 34 

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What did you learn from this article?

Printing the Fibonacci series up to n terms is a fundamental exercise that helps in understanding recursion and sequences in programming. This Java program demonstrates how to implement the Fibonacci series using a recursive method. By practicing such basic programs, you can strengthen your problem-solving skills and gain confidence in your ability to write efficient Java code. Keep practicing and exploring more problems to enhance your programming skills.