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#.  Why do we have  8 Primitive data type? Based on type and range of data , primitive   types are divided into 8 types. #.   Why do we have  4  referenced data type? To collect same type of values of Array is given and to collect different type of values class,interface and enum are given. JVM creates memory location based on the data type size,names that ML with the given name,and stores the assigned value in the memory location . This named memory location is technically called variable. Example:  class DataTypesDemo{   //primitive type variable creation            byte b =10; int i =20; char ch ='a';     //Array type variable creation                   double[] d ={1,2,3,4,5};     //predefined class string type variable creation           String str = "Hari";        public static void main(String [] args)       { </br>          //User defined class DataTypeDemo variable