How to loop through JSON objects?

IMO this is not a proper way of having a list of objects in a JSON. If you can, you should change this to

{
  "stocks": [
    {
      "name": "Torn City Stock Exchange",
      "acronym": "TCSE",
      "director": "None",
      "current_price": 10018.747,
      "market_cap": 0,
      "total_shares": 0,
      "available_shares": 0,
      "forecast": "Average",
      "demand": "High"
    },
    {
      "name": "Torn City and Shanghai Banking Corporation",
      "acronym": "TSBC",
      "director": "Mr. Gareth Davies",
      "current_price": 529.863,
      "market_cap": 4300246833486,
      "total_shares": 8115771121,
      "available_shares": 0,
      "forecast": "Average",
      "demand": "High",
      "benefit": {
        "requirement": 4000000,
        "description": "Entitled to receive occasional dividends"
      }
    },
    {
      "name": "Torn City Investment Banking",
      "acronym": "TCB",
      "director": "Mr. Paul Davies",
      "current_price": 502.819,
      "market_cap": 5771083717274,
      "total_shares": 11477457529,
      "available_shares": 1539811799,
      "forecast": "Average",
      "demand": "Average",
      "benefit": {
        "requirement": 1500000,
        "description": "Entitled to receive improved interest rates"
      }
    }
  ]
}

An ideal way would be to have a mapping class in Java and capture the JSON as List, then you can easily iterate.

private String json = "your json object here";

ObjectMapper objectMapper = new ObjectMapper();

List<MappingClass> stocks = objectMapper.readValue(jsonArray, new 
                            TypeReference<List<MappingClass>>(){});

  for (MappingClass stock : stocks) {
      stock.getName();
      // other fields
  }

Try having a look over The Jackson Library and ObjectMapper for reference.

You will probably want to use a well known JSON library such as GSON or JsonPullParser. GSON can deserialize your JSON into a Map that contains objects that you will have to define. So it will be something like a Map<Integer, Bank>. Your Bank class would look something like this:

public class Bank {
   String acronym;
   String name;
   //...
   Benefit benefit;
}

and then, if you use GSON, your parsing code will look something like this:

Map<Integer,Bank> bankMap;

Gson gson = new Gson();

Type type = TypeToken.getParameterized(Map.class, Integer.class, Bank.class).getType();
//result is a String that has your JSON!
bankMap = gson.fromJson(result, type);
for (Bank bank : bankMap.values()) {
   System.out.println("Bank name:" + bank.name);
   //...
}

The documentation for GSON is comprehensive and well written. It can be found here: https://github.com/google/gson

I hope what I wrote helps you! Good luck and please let me know how things went.