Best Time To Buy and Sell Stock

public class Solution {    public int maxProfit(int[] prices) {        int profit = 0;                if (prices == null || prices.length < 2) {            return profit;        }                int min = Integer.MAX_VALUE;                int cur = 0;                 while (cur < prices.length) {            min = Math.min(min, prices[cur]);            profit = Math.max(profit, prices[cur] - min);            cur++;        }                return profit;    }}