Fibonacci Sequence/Undead Rabbit Problem

package com.itperson;
/*
 * The case of a rabbit giving birth to a rabbit;
 * If there is a pair of rabbits, a pair of bunnies will be born every month from the third month, and the little rabbit will also give birth to a pair of bunnies every month from the third month
 * Assuming that the rabbit does not die, ask how many pairs of rabbits are there in the 20th month
 * first month: 1 pair
 * second month: 1 pair
 * third month: 2 pairs
 * fourth month: 3 pairs
 * fifth month Month: 5 pairs
 * Sixth month: 8 pairs
 * Seventh month: 13 pairs
 * Regularity: Except for the first month and the second month, every other month is the sum of the previous two months
 */
public class FeiBoLaQiDemo {
public static void main(String[] args) {
System.out.println(method(20));
}
public static int method(int x){
if(x==1 || x==2) {
return 1;
}else{
//Repeatedly call
return method(x-1)+method(x-2);
}
}
}