Check out example codes for "fibonacci sequence java using recursion". It will help you in understanding the concepts better.

Code Example 1

``````/*
Author: Jeffrey Huang
This finds the fibonacci number using a term provided by a user
A recursive method is used.

b)
9 calls are made to the fibonacci sequence in order to compute the 5th term.

*/
import java.io.*;
public class Fibonacci_JeffreyHuang
{
//static int counter=0;

public static long Fibonacci (long n)
{
//count++;
if (n == 1 || n == 2)
{
return 1;
}
else if (n <= 0)
{
System.out.println ("Error: There is no term less than 1");
return 0;
}
else
{
return (Fibonacci (n - 1) + Fibonacci (n - 2));
}
}

public static void main (String[] args) throws IOException
{
String sentinel = "yes";
long fib_term = 0;
boolean invalid;

while (sentinel.equalsIgnoreCase ("yes") || sentinel.equalsIgnoreCase ("y"))
{
//input
System.out.println ("Which fibonacci term would you like to find?");
invalid = true;
while (invalid == true)
{
invalid = false;
try
{
fib_term = Integer.parseInt (br.readLine ());
/*
while (fib_term<=0)
{
System.out.println ("Invalid input. Please try again.");
System.out.println ();
fib_term = Integer.parseInt (br.readLine ());
}
*/
}
catch (Exception e)  //in case the string is not a number
{
System.out.println ("Invalid input. Please try again.");
System.out.println ();
invalid = true;
}
}

//output
System.out.println ();
if (fib_term <= 0)
{
Fibonacci (fib_term);
}

else
{
System.out.println ("Term " + fib_term + " of the fibonacci sequence is " + Fibonacci (fib_term));
}
//System.out.println(counter);

//rerun program
System.out.println ();
System.out.println ("Would you like to run the program again? (y/n)");
System.out.println ();
sentinel = br.readLine ();
System.out.println ();

while (!(sentinel.equalsIgnoreCase ("yes") || sentinel.equalsIgnoreCase ("y")
|| sentinel.equalsIgnoreCase ("n") || sentinel.equalsIgnoreCase ("no")))
{
//System.out.println();
System.out.println ("Invalid input. Please try again.");
System.out.println ("Would you like to run the program again? (y/n)");
sentinel = br.readLine ();
System.out.println ();
}
}

System.out.println ("Program terminated by user.");

}
}``````

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