(Java) JSON: Array of Objects

Here we have a JSON object that contains an array, where each element in the array is a JSON object. This example demonstrates how to access the objects contained within an array.

{ 
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter","lastName":"Jones"}
  ]
}

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 = "{\"employees\":[{\"firstName\":\"John\", \"lastName\":\"Doe\"},{\"firstName\":\"Anna\", \"lastName\":\"Smith\"},{\"firstName\":\"Peter\",\"lastName\":\"Jones\"}]}";

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

    // Get the "employees" array.
    CkJsonArray employees = json.ArrayOf("employees");
    if (json.get_LastMethodSuccess() == false) {
        System.out.println("employees member not found.");
        return;
        }

    // Iterate over each employee, getting the JSON object at each index.
    int numEmployees = employees.get_Size();
    int i = 0;
    while (i < numEmployees) {

        CkJsonObject empObj = employees.ObjectAt(i);

        System.out.println("employee[" + i + "] = " + empObj.stringOf("firstName") + " " + empObj.stringOf("lastName"));

        i = i+1;
        }
  }
}