剑指offer 08跳台阶

public class Solution {

    public  static void main(String[] args){
        long startTime=System.currentTimeMillis();
        System.out.println("第30项的结果是："+JumpFloor(30));
        long endTime=System.currentTimeMillis();
        System.out.println("程序执行的时间："+(endTime-startTime)+"ms");
    }
    public static int JumpFloor(int target){
        int a=2,b=1,c=0;
        if(target==1||target==2){
            return target;
        }else{
            for(int i=3;i<=target;i++){
                c=a+b;
                b=a;
                a=c;
            }
            return c;
        }
    }
    /*public static int JumpFloor(int number){
        if(number<=0) {
               return 0;
            }else if(number>0&&number<4){
               return number;
            }else{
               return JumpFloor(number-1)+JumpFloor(number-2);
            }
    }
    */
}

function jumpFloor(number)
{
    if(number<=0) {
       return 0;
    }else if(number>0&&number<4){
       return number;
    }else{
       return jumpFloor(number-1)+jumpFloor(number-2);
    }
    // write code here
}