Java Challenge - Fibonacci Finder

This community-built FAQ covers the “Fibonacci Finder” code challenge in Java. You can find that challenge here, or pick any challenge you like from our list.

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Iteration:

public static int fibFinder(int n) {
if (n == 0) {
return 0;
}
if (n == 1) {
return 1;
}
int n1 = 0;
int n2 = 1;
int n3;
int count = 2;
while (count <= n) {
n3 = n2 + n1;
count++;
n1 = n2;
n2 = n3;
}
return n2;
}

Dynamic Programming:

private static int fib(int n, HashMap<Integer, Integer> record) {
if (n == 0) {
return 0;
}
if (n == 1) {
return 1;
}
if (record.containsKey(n)) {
return record.get(n);
}
int n2 = fib(n - 2, record);
int n1 = fib(n - 1, record);
int result = n1 + n2;
record.put(n, result);
return result;
}

public static int fibFinder(int n) {
return fib(n, new HashMap<Integer, Integer>());
}

public class FibonacciFinder {
public static void main(String args) {
System.out.print(fibFinder(6));
}

public static int fibFinder(int n) {
int num1=0, num2=1;
for(int i=0;i<n;i++) {
int num3 = num1+num2;
num1=num2;
num2=num3;

}

return num1;
}

}