# Java Programs 13: Java Program to Print Fibonacci Series of Given Length Using Collection

Hello Folks,

This is a frequently asked programming interview question to print a fibonacci series of given length.

### Fibonacci series:

Wikipedia defines it very well.

The **Fibonacci numbers** are the numbers in the following integer sequence, called the **Fibonacci sequence**, and characterized by the fact that every number after the first two is the sum of the two preceding ones:^{}

Often, especially in modern usage, the sequence is extended by one more initial term:

^{}

So now we know what is fibonacci series. Let’s think of logic to convert in program:

- We need to store numbers in variables. Since we need to store multiple variables of same type, instead of creating multiple variables, we can use an array or a collection class.
- In this post, I will use a collection class instead of arrays. In an interview if you solve a program using collections, it is really appreciated and leaves a positive impact on your interviewer.
- To find nth index number in fibonacci series, you need to access and add (n-1)th index and (n-2)th indexed element.

Java program:

Output:

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#HappyCoding

your code will break if user enter length of series in three digit

Very nice and different logic using collections. Thanks for sharing it. Generally everyone uses the simple one in case they want to print the first 10 numbers of Fibonacci series

a=0

b=1

print a

print b

while(counter < 8)

{

c=a+b

print c

a=b

b=c

}