Data type :
Data type in the Apex tells about what type of data can be stored .
What is the range of the of the that can be stored.
Primitive data types
Collections
Enums
Primitive data type:
These are the datatypes which are predefined by the Apex.
A premetive data type such as an Integer, Double,Long,Date, Data Time, String , Id and Boolean.
All primitive data types are passed by value , not by refrence.
All Apex variables ,whether they are class member variables are initilized to null .Make sure that we initilize variables to appropriate values before using them.
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