How to extract symbols provided in every trade?

I’m getting the file as out. Please help me how to extract symbols using pojo getter function.Also am i on the right track?

Yes you are on the right track.
You need to use loops to iterate through the list of pojo class and use getter in that loop

As you can see, the output is an array containing trades data for every symbol/company (i.e AAPL, MSFT). You have to come up with a logic to iterate through each object in that array and get “symbols” out of it.