data type | data type casting | Robust Coders

Data Type - Based on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory. Therefore, by assigning different data types to variables, you can store integers, floating type values , or characters in these variables. So its all about the memory allocation of the particular variable.

Data types represent the different values to be stored in the variable .
In java, there are two types of data types:

Primitive data types
Non-primitive data types or Reference Data types

In Primitive data types there are 8 data types.
like- byte,short,int,loang float,double,boolean,char

In reference data type there are variaous data types
like- class,array,enum,interface etc.

Now Data type casting-
converting one data type to another either implicitly or explicitly.

Java data type casting comes with 3 types.
Implicit casting
Explicit casting
Boolean casting.

1. Implicit casting (widening conversion)

A data type of lower size (occupying less memory) is assigned to a data type of higher size. This is done implicitly by the JVM. The lower size is widened to higher size. This is also named as automatic type conversion.

2. Explicit casting (narrowing conversion)

A data type of higher size (occupying more memory) cannot be assigned to a data type of lower size. This is not done implicitly by the JVM and requires explicit casting; a casting operation to be performed by the programmer. The higher size is narrowed to lower size.

3. Boolean casting
It is very important thing to understand about boolean data type and their casting.
So ,A boolean value cannot be assigned to any other data type. Except boolean, all the remaining 7 data types can be assigned to one another either implicitly or explicitly; but boolean cannot. We say, boolean is incompatible for conversion. Maximum we can assign a boolean value to another boolean.

created by- rajeev sir

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