Data type Casting (Type Conversion) in java

Sometimes we will find situations where the type of a data type needs to be cast.Casting means conversion of one data type to another data type.

In java type casting can be classified in three categories:

Implicit casting

Explicit casting

Boolean casting.

1.  Implicit casting:- A data type of lower size is assigned to the data type of higher size.This is also named automatic type conversion.For ex:

int x = 9;                    

double y = x;              

System.out.println(y); 

In the above code 4 byte integer value is assigned to 8 byte double value.

2. Explicit casting:- The problem is cast the data type higher size to lower size.So this problem is overcome by the Explicit casting that is not done by the JVM , it is done by the programmer.For ex:

double x = 8.5;             

int y = x;  

In this code compilation error created because it is Implicit casting rule but it converts higher size Double to lower size Int.So explicit  casting is:

double x = 8.5;                  

int y = (int) x;   

In this code the Double x is explicitly converted to Int y.

3. Boolean casting:- The Boolean value cannot be assigned to any other data type.Except Boolean all the other 7 data types are converted implicitly or explicitly.We can also say Boolean is incompatible for conversion.