JSON Handler Implementation

A JSON handler is a custom data structure that reconstitutes JSON encoded objects into Java data structures. The handler must add, get, sort, search for values, remove and export JSON objects. It must parse JSON strings, implement at least one Java data structure interface, handle serializable objects, determine if an object implements Comparable and its class.

JSON Handler
you are tasked with creating a JSON handler. A JSON stands for JavaScript Object Notation (See: JSON
Description). A JSON is a lightweight data-interchange formatted as a string that can be parsed back into
the object it represents. Your JSON handler will be a custom data structure that will reconstitute the
JSON encoded objects in your data-structure objects. Your data structure must:
1. Add new object
2. Get an object
3. Sort sortable objects
4. Search for a specific value (binary for sortable/linear for un-sortable)
5. Remove a specific object
6. Export an object as a JSON
Your data structure:
 Must parse JSON Strings
 Must implement at least one java data structure interface
 Must handle serializable object (to serialize and de-serialize objects)
 Must be able to determine an object if an object implements Comparable
 Must be able to determine an object’s class
Objects in Objects
A JSON object may have multiple name-value pairs in it (see: JSON Description). The value in a name-
value pair can be one or more name-value pairs:
{ name : { name : value , name : value } }
For example, imagine that rows from a database are downloaded as JSON objects. Each row would have
the same basic format. Each “name” would be a column and each “value” would be the data in that row
for that column and the main identifier would be the primary key identifying the row.
{ primary key : { “fname” : “fred” , “lname” : “jones” , “age” : “35” , “address” : “123 Main st” }
In this example, there is an object whose “name” is the primary key of a database table and its value is a
separate data structure of four other name-value objects. You might imagine the entire data base table
is a giant data structure of all the “row objects” in the table.

JSON Description
“JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to
read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript
Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is
completely language independent but uses conventions that are familiar to programmers of the C-family
of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties
make JSON an ideal data-interchange language.
JSON is built on two structures: A collection of name/value pairs. In various languages, this is realized as an object, record,
struct, dictionary, hash table, keyed list, or associative array.
 An ordered list of values. In most languages, this is realized as an array, vector, list, or
sequence.”
-Source: http://www.json.org/
A JSON object can be formatted simply curly braces and a colon similar to the way a key-value object (as
in a hash table) is notated. i.e.: { name : value }
-Source: http://www.json.org/
JSON object can have more than one name-value pair separated by commas.
{ name : value , name2 : value2 }
A JSON array is an ordered (indexed) collection of JSON objects. A JSON array is simply notated with
square brackets with comma separators in between JSON objects.. For example:
[ { name : value } , { name2 : value2 } ]
A JSON array can also have a name of its own:
{ name: [ { name : value } , { name2 : value2 } ] }
In this way a JSON array can be a value in a name-value pair. In fact, a value can be any object. A value
can be another data structure (ArrayList, LinkedList, HashTable, ect.) or an instance of another class.
“A value can be a string in double quotes, or a number, or true or false or null, or an object or an array.
These structures can be nested.” -Source: http://www.json.org/

-Source: http://www.json.org/
Parsing JSONs
JSON are strings. Even when the “value” is an object, that object is serialized (convert into a bit string).
You can easily parse strings by using Sting function .split(). You can parse JSON objects by splitting on
the String “:”. You can parse JSON arrays by splitting on the String “,”.