Buy and sell Stock

public static int maxProfit(int prices[]){
        int buyPrice = Integer.MAX_VALUE;
        int maxProfit = 0;

        for(int i=0; i<prices.length; i++){
            if(buyPrice < prices[i]){
               int profit = prices[i] - buyPrice; 
               maxProfit = Math.max(maxProfit, profit); 
            }
            else{
                buyPrice = prices[i];
            }
        }
        return maxProfit;
    }