Fibonacci columns java offer to prove safety

Fibonacci number

public class Solution{
    public int Fibonacci(int n){
        int []arr=new int[40];
        arr[0]=0;
        arr[1]=1;
        for(int i=2;i<40;i++){
            arr[i]=arr[i-1]+arr[i-2];
        }
        return arr[n];
    }
}

Cattle off the Internet to do, platform test n <39, so that's it.