In the previous article we have discussed about Java Program to Print the Series 1 2 9 28 65 N

In this article we are going to see how to print the Fibonacci series by using Java programming language. Observe, 1 1 2 3 5 8 Pattern In Java, 1+1+2+3+5+8 Java Program, Fibonacci Series Logic In Java, 0 1 2 3 6 Series In Java, 1+(1*2)+(1*2*3) Java Program, Fibonacci Series In Java Using Scanner, 0 1 1 2 3 5 In Java, 1 2 2 3 3 3 Pattern In Java, Fibonacci Series In Java Using While Loop.

## Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N

On observing the pattern carefully, we can see 1^{st} and 2^{nd} number is 1, 1

Then the next number follows a logic by adding with the previous 2 numbers.

1 1 1+1 = 2 2+1 = 3 3+2= 5 …. and so on.

**Example:**

1 | 1 | 2 | 3 | 5 | 8 | …… | N |

Let’s see different ways to print Fibonacci series.

### Method-1: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using For Loop

**Approach:**

- Create Scanner class object.
- Declare an integer variable say ‘
`n`

’ which holds the Nth term of the series. - Prompt the user to enter a number as value of
`n`

. - Let declare an integer variable say ‘
`a`

’, ‘`b`

’ and initialize it to 1, 1 respectively. - Use a for loop
`from i=1 to i<=n-2`

where the loop is incremented by 1 - Inside the for loop we will find the value of
`c`

where`c=a+b`

, now after getting the third term now`a`

becomes`b`

and`b`

becomes`c`

and then the loop continues till it is terminated. - Print the result in the series.

**Program:**

import java.util.*; public class Main { public static void main(String [] args) { //creating object of Scanner class Scanner s = new Scanner(System.in); //Taking input of number of elements in the series System.out.println("Enter the Nth term “N” "); int n = s.nextInt(); int a = 1, b=1; System.out.print(a+" "+b); //for loop to print the series for (int i = 1; i <= n-2; i++) { int c = a+b; a = b; b = c; System.out.print(" "+c); } } }

Output: Enter the Nth term “N” 5 1 1 2 3 5

### Method-2: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using While Loop

**Approach:**

- Create Scanner class object.
- Declare an integer variable say ‘
`n`

’ which holds the Nth term of the series. - Prompt the user to enter a number as value of
`n`

. - Let declare an integer variable say ‘
`a`

’, ‘`b`

’ and initialize it to 1, 1 respectively. - Declare and initialize an integer variable
`i=1`

- Continue a while loop
`till i<=n-2`

, where`i`

is incremented by 1. - Inside the while loop we will find the value of
`c`

where`c=a+b`

, now after getting the third term now`a`

becomes`b`

and`b`

becomes`c`

and then the loop continues till it is terminated. - Print the result in the series.

**Program:**

import java.util.*; public class Main { public static void main(String [] args) { //creating object of Scanner class Scanner s = new Scanner(System.in); //Taking input of number of elements in the series System.out.println("Enter the Nth term “N” "); int n = s.nextInt(); int a=1, b=1; System.out.print(a+" "+b); int i=1; while(i<=n-2) { int c = a+b; a = b; b = c; System.out.print(" "+c); i++; } } }

Output: Enter the Nth term “N” 7 1 1 2 3 5 8 13

### Method-3: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using User Defined Method

**Approach:**

- Create Scanner class object.
- Declare an integer variable say ‘
`n`

’ which holds the Nth term of the series. - Prompt the user to enter a number as value of
`n`

. - Then call a user defined method say
`printSeries()`

by passing`n`

as parameter. - Inside method declare an integer variable say ‘
`a`

’, ‘`b`

’ and initialize it to 1, 1 respectively. - Use a for loop
`from i=1 to i<=n-2`

where the loop is incremented by 1 - Inside the for loop we will find the value of
`c`

where`c=a+b`

, now after getting the third term now`a`

becomes`b`

and`b`

becomes`c`

and then the loop continues till it is terminated. - Print the result in the series.

**Program:**

import java.util.*; public class Main { public static void main(String[] args) { // creating object of scanner class Scanner s = new Scanner(System.in); //Taking input of number of elements in the series System.out.println("Enter the value of Nth term 'N' "); int n = s.nextInt(); // calling printSeries method to print the series printSeries(n); } //printSeries method to print the series public static void printSeries(int n) { int a=1, b=1; System.out.print(a+" "+b); //for loop to print the series for (int i = 1; i <=n-2; i++) { int c = a+b; a = b; b = c; System.out.print(" "+c); } } }

Output: Enter the value of Nth term 'N' 9 1 1 2 3 5 8 13 21 34

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**Test yourself:**

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