Org.json library is also called JSON-Java library. This post will discuss different libraries that can be utilized for this purpose. Thus, the json string should represent a valid json else an error will be thrown. Note that all the libraries parse the json string. All these are only possible when you have an object representation of this json string.įortunately, there are many libraries which make it possible to convert a json string to object in java. The application needs to find value of some key or iterate over this string or display it in a tree view etc. Since json is now frequently used to store data, there might be a case that in your java application, you have a string which is in json format stored in a database or a file or through a form submit event. Also, it is pretty easy to traverse across a json object for retrieving values.Ī json string or json object stores data in key-value format and it can also represent complex parent-child relationships thus making it a preferred way to store and transmit data. A json object can be easily converted to a string and vice-versa. JSON stands for Java Script Object Notation and has become the most popular format for transfer and storage of data since due to its light weight nature.ĭata between client and server can only be transferred in the form of a string. 8.Warning: WP_Syntax::substituteToken(): Argument #1 ($match) must be passed by reference, value given in /home3/codippac/public_html/wp-content/plugins/wp-syntax/wp-syntax.php on line 380 Here we'll get the contents of object result exactly as before. JSONArray result = CDL.toJSONArray(ja, string) We have an alternative way of doing this where we can achieve the same functionality by supplying a JSONArray to get the headers and a comma delimited String working as the data.Īgain, we separate different lines using a carriage return (\r) or line feed (\n): JSONArray ja = new JSONArray() Notice that both data and header were supplied within the same String. The object JSONArray result now consists of the following (output formatted for the sake of clarity): [ JSONArray result = CDL.toJSONArray(string) The first line is interpreted as a list of headers, and all the subsequent lines are treated as data: String string = "name, city, age \n" + This method is overloaded and supports a wide range of data types.įor a complete list of methods supported by JSONArray, visit the official documentation. put(Object value) – append an object value to this JSONArray.If there's no value at that index, then a null is returned. opt(int index) – returns the value associated with an index (between 0 and total length – 1). get(int index) – returns the value at the specified index (between 0 and total length – 1), otherwise throws a JSONException.These are the primary methods of the JSONArray class: Like JSONObject, it has a constructor that accepts a source String and parses it to construct a JSONArray. It's represented by a String wrapped within square brackets and consists of a collection of values separated by commas.Values can be anything from a Number, String, Boolean, JSONArray, or JSONObject to even a JSONObject.NULL object.A JSONArray is an ordered collection of values, resembling Java's native Vector implementation.
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