Find the nth Fibonacci number and Check whether given number is Fibonacci and it's nth position in series

Find the nth Fibonacci number and Check whether given number is Fibonacci

##and it's nth position in series

import java.util.*;

public class Fibonacci{
//print nth Fibonacci number from series....
public static int fibonacciNum(int num){

  int a=0,b=1;
  if(num==1){
    return 0;
  }
  if(num==2){
    return 1;
  }
  return fibonacciNum(num-1)+fibonacciNum(num-2);
}
//to check given number is Fibonacci or not and it's nth position in series...
public static int checkFibonacci(int num){
  if(num<0){
    return -1;
  }
  if(num==0){
    return 1;
  }
  for(int i=1;i<num;i++){
    if(fibonacciNum(i)==num){
      return i;
    }
    else{
      continue;
    }
  }
  return -1;
}

public static void main (String[] args) {
int n=fibonacciNum(9);
System.out.println(n);
int m=checkFibonacci(8);
System.out.println(m);
}
}