Java Program to Print Fibonacci Series

Last Updated: 14 March, 2023

On this tutorial page we are going to learn how to write a Java program to print fibonacci series.

The Fibonacci series is a sequence of numbers in which each number is the sum of the two preceding numbers. The first two numbers in the Fibonacci sequence are 0 and 1. After that, each subsequent number is the sum of the previous two. So the sequence goes 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on.

Here's a Java program to print the Fibonacci series up to a given number:

Example 1 : Fibonacci Series Using for Loop in Java

  public class FibonacciSeries {
    public static void main(String[] args) {
      int number = 10, num1 = 0, num2 = 1;
      System.out.println("Fibonacci Series of " + number + " numbers:");
  
      for (int i = 1; i <= number; ++i) {
        System.out.print(num1 + " ");
  
        /*
         * On every iteration of loop, assigning second number to the first number and
         * assigning the sum of last two numbers to the second number
         */
        int nextNumber = num1 + num2;
        num1 = num2;
        num2 = nextNumber;
      }
    }
  }

Output

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

Example 2 : Fibonacci Series Using while Loop in Java

  public class FibonacciSeries2 {
    public static void main(String[] args) {
      int number = 10, num1 = 0, num2 = 1, i = 1;
      System.out.println("Fibonacci Series of " + number + " numbers:");
  
      while (i <= number) {
        System.out.print(num1 + " ");
  
        /*
         * On every iteration of loop, assigning second number to the first number and
         * assigning the sum of last two numbers to the second number
         */
        int nextNumber = num1 + num2;
        num1 = num2;
        num2 = nextNumber;
        i++;
      }
    }
  }

Output

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

Example 3 : Fibonacci Series Using for Loop and Scanner Class

  
  import java.util.Scanner;
  public class FibonacciSeries3 {
    public static void main(String[] args) {
      int num1 = 0, num2 = 1;
      Scanner scanner = new Scanner(System.in);
      System.out.print("Enter the number: ");
      int number = scanner.nextInt();
      System.out.println("Fibonacci Series of " + number + " numbers:");
      scanner.close();
      for (int i = 1; i <= number; ++i) {
        System.out.print(num1 + "  ");
        
        /*
        * On every iteration of loop, assigning second number to the first number and
        * assigning the sum of last two numbers to the second number
        */
        int nextNumber = num1 + num2;
        num1 = num2;
        num2 = nextNumber;
      }
    }
  }

Output

Enter the number: 20
Fibonacci Series of 20 numbers:
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181