Basic over view of Json / Gson

The basic format of JSON (Javascript Object Notation) 

Business object & Property & Value in the JSON 

Note: The business object must match with the name of the property

Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson is an open-source library. 

Strength of Gson

• Light-weight languages.
• Similar C-family language but completely independent languages. 
• Easy to read & writhe language for humans, easy to parse and manipulate for computer
• JSON is based on a subset on JavaScript 
• Provide a class that is used to parse or manipulate Json with java.
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Purpose of Gson

• Provide easy-to-use mechanisms like toString() and constructor (factory method) to convert Java to JSON and vice-versa
• Allow pre-existing unmodifiable objects to be converted to and from JSON
• Allow custom representations for objects
• Support arbitrarily complex object
• Generate compact and readable JSON output

Array Examples

Gson gson = new Gson();
int[] ints = {1, 2, 3, 4, 5};
String[] strings = {"abc", "def", "ghi"};

(Serialization)
gson.toJson(ints);     ==> prints [1,2,3,4,5]

gson.toJson(strings);  ==> prints ["abc", "def", "ghi"]

(Deserialization)
int[] ints2 = gson.fromJson("[1,2,3,4,5]", int[].class);
==> ints2 will be same as ints

We also support multi-dimensional arrays, with arbitrarily complex element types