java pojos code example

Example: what is pojo

It stands for Plain old Java Object 
and basically we use it when we need to represent
some data as Java object. So to that we need to 
create a Java class to represent it's data.

For example:
{ "name" : "ABC",
  "gender : "Female",
  "phone : 1234567890 }
  
So we can create a java object with this
3 data and encapsulate them (name, gender, phone)
and also we need to create constructor to
create object easily
 
So the idea is we want to create a class
and eventually we want it to turn into Json file
automatically. Without us doing anything.