Best Time to Buy and Sell Stock

public class Solution {
    public int maxProfit(int[] prices) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        if(prices == null||prices.length == 0)
            return 0;
        int result = 0;
        int min = prices[0];
        for(int i = 0; i < prices.length; i++)
        {
            if(prices[i] < min)
                min = prices[i];
            result = Math.max(result, prices[i]-min);
        }
        return result;
    }
}