(Java) JSON: Nested Array

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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[])
  {
    CkJsonObject json = new CkJsonObject();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    String jsonStr = "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }";

    boolean success = json.Load(jsonStr);
    if (success != true) {
        System.out.println(json.lastErrorText());
        return;
        }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    CkJsonArray outerArray = json.ArrayOf("numbers");
    if (json.get_LastMethodSuccess() == false) {
        System.out.println("numbers array not found.");
        return;
        }

    int numArrays = outerArray.get_Size();
    int i;

    for (i = 0; i <= numArrays - 1; i++) {

        CkJsonArray innerArray = outerArray.ArrayAt(i);

        // The first item in the innerArray is a string
        System.out.println(innerArray.stringAt(0) + ":");

        int numInnerItems = innerArray.get_Size();
        int j;
        for (j = 1; j <= numInnerItems - 1; j++) {

            System.out.println("  " + innerArray.IntAt(j));

            }

        }
  }
}