Why is the isEmpty function not working for my code?

Question

I'm running into an issue when I try to check if an input integer array is empty. The error message just reads: cannot find symbol.

If the prices array is not empty, I want to be able to run the rest of the code.

If it is, I want it to return 0.

import java.util.ArrayList;
import java.util.Collections;
class Solution {
    public int maxProfit(int[] prices) {

    int i;
    int j;
    int profit;
    int maxProfit = 0;
    List<Integer> profitArray = new ArrayList<Integer>();

        if (!prices.isEmpty()) {
            for (i = 0; i < prices.length; i++) {
                for (j = (i+1); j < ((prices.length)-1); j++) {
                    int diff = prices[j] - prices[i];
                    profitArray.add(diff);
                }
            }



            profit = Collections.max(profitArray);

                if (profit>0) {
                    maxProfit = profit;
                }

            maxProfit = 0;

            return maxProfit;
            }
        return 0;
        }

    }

There is no such method for arrays. – Tom Oct 25 '19 at 17:24 — Tom, Oct 25 '19 at 17:24
Yeah `prices` is not an ArrayList... it is an array – RobOhRob Oct 25 '19 at 17:28 — RobOhRob, Oct 25 '19 at 17:28

score 0 · Answer 1 · answered Oct 25 '19 at 17:39

0

If you want check your prices array is not empty then use the following code if(null !=prices && prices.length != 0)

answered Oct 25 '19 at 17:39

SJN

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Why is the isEmpty function not working for my code?

1 Answers1