兔子的总数问题

package com.cyj.test;

public class Rabbit {
   public static void main(String[] args) {

          // TODO 自动生成方法存根

          int t1=1,t2=1,t3=1;
          for(int i=1;i<=20;i++){
                 if(i==1||i==2){
                        System.out.println("第"+i+"个月的兔子总数为："+t3*2);
                 }
                 else{
                        t3=t1+t2;
                        System.out.println("第"+i+"个月的兔子总数为："+t3*2);                    
                        t1=t2;
                        t2=t3;
                 }
          }
   }
}