Leetcode122 the best time to buy and sell stocks II

Give you an array of integers prices , among  prices[i] Represents a stock i Sky price .

Every day , You can decide whether to buy and / Or sell shares . You at any time   most   Can only hold A wave of Stocks . You can also buy... First , And then in On the same day sell .

return What you can get Maximum profits  .

Input ：prices = [7,1,5,3,6,4]
Output ：7
explain ： In the 2 God （ Stock price = 1） Buy when , In the 3 God （ Stock price = 5） Sell when , The exchange will make a profit = 5 - 1 = 4 .
     And then , In the 4 God （ Stock price = 3） Buy when , In the 5 God （ Stock price = 6） Sell when , The exchange will make a profit = 6 - 3 = 3 .
      The total profit is 4 + 3 = 7 .

 public int maxProfit(int[] prices) {
        int maxProfit = 0;
        for(int i = 1; i < prices.length;i++){
           maxProfit += Math.max(0,prices[i] - prices[i-1]);
        }
        return maxProfit;
    }