Java

Demonstrates how to Handle Large Integers in JSON

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Demonstrates how to handle large integers in JSON. (Integers larger than what can fit in a 32-bit signed integer.) Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // Let's say your JSON has this:

    // {
    // 	"id": 20000000001234567
    // }

    CkJsonObject json = new CkJsonObject();

    success = json.LoadFile("qa_data/json/large_int.json");
    if (success == false) {
        System.out.println(json.lastErrorText());
        return;
        }

    // The integer is too large for a 32-bit signed integer that is returned by IntOf.
    // The result will be something that wrapped around and could be negative.
    // In this case it would be: -543893881
    int id = json.IntOf("id");
    System.out.println("id: " + id);

    // The solution is to read the integer value as a string, and then use the features in your programming language
    // to convert from a string to a 64-bit integer.
    // 
    // Alternatively, you may wish to simply hold the value as a string.  If, for example, the integer simply references
    // an order ID, an account ID, etc., then there's no need to convert to an integer value.  You're not going to be doing
    // mathematical operations on it anyway.  This is usually the case for large integers -- they typically exist
    // in JSON as an account ID.

    // You can get any JSON value as a string:
    String accountId = json.stringOf("id");
    System.out.println("accountId: " + accountId);

    // Sample output:

    // id: -543893881
    // accountId: 20000000001234567
  }
}