Java

Find and Delete Object from JSON Array

See more JSON Examples

Demonstrates how to find an delete an object from a JSON array of objects. 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;

    //  This example will delete the "Pasta" category object from Menu B.

    //  {
    //    "menus": [
    //      {
    //        "name": "Menu A",
    //        "categories": [
    //  			{
    //  			"name": "Kebabs",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Burgers",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Pasta",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Appetizers",
    //  			"description": "blah blah blah"
    //  			}
    //  		]
    //  	},
    //      {
    //        "name": "Menu B",
    //        "categories": [
    //  			{
    //  			"name": "Kebabs",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Burgers",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Pasta",
    //  			"description": "blah blah blah"
    //  			},
    //  			{
    //  			"name": "Appetizers",
    //  			"description": "blah blah blah"
    //  			}
    //  		]
    //  	  }
    //  	]
    //  }

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

    //  Find Menu B.
    CkJsonObject menu = json.FindRecord("menus","name","Menu B",true);
    //  assume menu is found..

    //  Get the categories array, and then find the index of the "Pasta" menu category.
    CkJsonArray catArr = menu.ArrayOf("categories");
    //  Assume it is found..

    //  Find the object where the name of the JSON member is "name", and the value is "Pasta"
    int index = catArr.FindObject("name","Pasta",true);
    if (index < 0) {
        System.out.println("Pasta not found.");
        }
    else {

        //  Delete the "Pasta" category record from Menu B
        success = catArr.DeleteAt(index);
        //  Assume OK..
        }

    //  Examine the JSON to see if it worked as expected..
    json.put_EmitCompact(false);
    System.out.println(json.emit());
  }
}