Type Casting

  Assigning a value of one type to a variable of another type is known as Type Casting.

In Java, type casting is classified into two types,
    1.Implicit casting
    2.Explicit casting 

1. Implicit casting (widening conversion)

   A data type of lower size is assigned to a data type of higher size. This is done implicitly by the JVM. The lower size is widened to higher size. 

Example:

/*Implicit type casting program in java.*/ 
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public class CastExample
{
  public static void main(String[] args)
    {
      int i = 102;
      long l = i;       //Implicit type casting 
      double d = l;  //Implicit type casting   
      System.out.println("Int value "+i);  
      System.out.println("Long value "+l);
      System.out.println("Double value "+d);
    }
}

● Save the file as CastExample.java.

Output:

>java  CastExample
Int value 102
Long value 102
Double value 102.0

---

2.Explicit casting(narrowing conversion)

   When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting.
Example:
/*explicit type casting program in java.*/ 
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public class CastExample
{
  public static void main(String[] args)
    {
      double d = 102.04;  
      long l = (long)d;  //explicit type casting 
      int i = (int)l; //explicit type casting   
      System.out.println("Double value "+d);
      System.out.println("Long value "+l);
      System.out.println("Int value "+i);
    }

}

● Save the file as CastExample.java.

Output:

>java  CastExample

Double value 102.04
Long value 102
Int value 102