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Severity: Notice

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Backtrace:

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Line: 191
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
Line: 433
Function: view

File: /home/prodcxja/public_html/questions/index.php
Line: 315
Function: require_once

public abstract class JsonElement extends Object 

A class representing an element of Json. It could either be a JsonObject, a JsonArray, a JsonPrimitive or a JsonNull.

public final class JsonObject extends JsonElement 

A class representing an object type in Json. An object consists of name-value pairs where names are strings, and values are any other type of JsonElement. This allows for a creating a tree of JsonElements. The member elements of this object are maintained in order they were added.

Yay google!

Nevermind that question.

JsonElement contains common code for all the valid types in JSON:

  • JsonObject
  • JsonArray
  • JsonPrimitive (string, number, boolean)
  • JsonNull

This allows you a write a method that takes a JsonElement that works with any of the above types.

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JsonElement is the base type for all of the different specific types - it's a base class with common things that all nodes should implement. Logically, this makes a lot of sense.

The thing that all specific types inherits from JsonElement is a good thing for you, too. It allows you to test if an object is a Json node representation, simply by checking if it inherits from JsonElement.

The JsonElement class is available to you as a public class probably not because you'd want to subclass it, but because you'd want to test for its subclasses.

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