Java基于高精度整型实现fibonacci数列的方法

package com.java.learning.recursion;
import java.math.*;
public class MainClass {
  public static void main(String args[]){
    for(int i = 0; i < 100; i++){
      f(i+1);
    }
  }
   
  public static BigInteger f(long n){
    if(n <= 2){
      return new BigInteger("1");
    }else{
      BigInteger n1 = new BigInteger("1");
      BigInteger n2 = new BigInteger("1");
      BigInteger temp = new BigInteger("0");
       
      for(long i = 0; i < n -2; i++){
        temp = n1.add(n2);
        n1 = n2;
        n2 = temp;
      }
      System.out.println("第" + n + "项为：" + n2);
      return n2;
    }
  }
}