What are datatypes in Java ?

Datatype in any programming language specifies the type of variable. 

for example, if we define a variable 

                    String a = "CuriousBaba";

Here String is a datatype. So, String specifies that a string of characters can only be stored in the variable.

There are two types of datatype in Java 

1. Primitive Datatype

2. Non-primitive Datatype

Primitive datatype include byte, short, float, int, long, boolean, char, double.

Non-primitive datatype String, Array, Class, Interface.

What is a primitive datatype ?

In a primitive datatype the maximum size of the data to be stored in the varible is predefined. 

Primitive datatype is a predefined datatype. A primitive datatype should always have some value in it, it cannot be null.