type casting in java

Converting a value of one data type into a variable of another data type is called as type casting.

Type casting  is called as type conversion.
Types
Type casting is of two types they are 

1)Implicit type Casting (Widening)
2)Explicit  type Casting (Narrowing)

Widening or Implicit type Casting

Conversion of smaller data type into larger data type is called as Widening or Implicit Casting

It is called as Automatic type conversion

There is no data loss in implicit type casting

e.g

      int a=100 ;
      double b;
       b=a;

      

Example :

   public class Demo

   {

    public static void main(String[] args)

    {

      int a = 100;

      double b;

      b=a;

      System.out.println("Int value is: "+a);

      System.out.println("Double value is: "+b);

    }

}

Output:

Int value is: 100

Double value is: 100.0

Note:

Here we are converting int to double that means smaller data type to bigger data type. So there is no data loss occurs.

Narrowing or Explicit type Casting

Conversion of  larger datatype into smaller data type is called as Narrowing or Explicit type conversion

It is not Automatic type conversion because you have to do explicitly.

Data loss occurs in explicit type casting because it is the conversion of 

larger datatype into smaller data type.

e.g:

double  a=23.456;

int  b;

b=(int)a;

Example :

public class Demo

{

    public static void main(String[] args)

    {

      double a=23.456;

      int b;

      b=(int)a;

      System.out.println("Double value is: "+a);

       System.out.println("Int value is: "+b);

    }

}
Output
Double value is:23.456
Int value is:23

Note:

Here we are converting double to int that means bigger data type to smaller data type.So data loss occurs.