Print out the company, date and average stock price on that date

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String[] stockPrice = { "Reliance", "2022-01-01 10:00", "100",
"Reliance", "2022-01-01 10:34", "110",
"Tata", "2022-01-01 10:30", "500",
"Reliance", "2022-03-02 10:15", "120",
"Tata", "2022-01-01 12:00", "400" };

This is given array in which I have to print the company name , date and average price.

So in array company having prices on same date but different time , so I have to calculate the average of stock price.

Output:

ComapnyName Date Avg
------------------------------------------
Relaince 2022-01-01 105
Relaince 2022-03-02 120
Tata 2022-01-01 450

I tried but how will I check that company having different prices at same date .
what should I try ?
Its a single dimensional array.

What I have tried:

public class CompanyStocks {

public static void main(String[] args) {

// ArrayList<string> compNameList = new ArrayList<>();
// ArrayList<string> compTimeStamps = new ArrayList<>();
// ArrayList<string> compStockPrize = new ArrayList<>();
//
String[] stockPrice = { "Reliance", "2022-01-01 10:00", "100",
"Reliance", "2022-01-01 10:34", "110",
"Tata", "2022-01-01 10:30", "500",
"Reliance", "2022-03-02 10:15", "120",
"Tata", "2022-01-01 12:00", "400" };
for(int i=0; i

Posted 10-Jun-22 5:55am

Member 13102977

Updated 17-Jun-22 4:08am

v6

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Richard MacCutchan · Answer 1 · 2022-06-10T06:17:00

Solution 1

You should make it into a multi-dimensional array like:

String[][] stockPrice = { 
    { "Reliance", "2022-01-01 10:00", "100" },
    { "Reliance", "2022-01-01 10:34", "110" },
    { "Tata", "2022-01-01 10:30", "500" },
    { "Reliance", "2022-03-02 10:15", "120" },
    { "Tata", "2022-01-01 12:00", "400" },
};

You can now process each individual set and calculate the averages by creating a new Map collection for each product name. See Lesson: Interfaces (The Java™ Tutorials > Collections)[^].

Posted 10-Jun-22 6:17am

Richard MacCutchan

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Member 13102977 17-Jun-22 10:08am

This question is asked in an interview , and its a single dimensional array , I able to print the company , timestamps and price of different companies but problem is that if same company have different price on same date but different time , so I have calculate the average price of same company , so how we do this ?

Richard MacCutchan 17-Jun-22 10:42am

The way I suggested in my answer. Create new lists for each company, and add all items belonging to each compnay to its own list. You can then calculate averages etc. Alternatively use each company name to calculate the total of all its prices and the number of entries. Again use that data to calculate the average.

Print out the company, date and average stock price on that date

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Print out the company, date and average stock price on that date

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