Type Casting

When a value of one type is assigned to another is known as type casting.  Primitive data types occupy different sizes in the memory. Such as, an integer is 32 bit and long is 64 but. For passing the values between different data types we need type casting.   

There are two type of casting

1. Implicit or  Upcasting

2. Explicit or Downcasting

Implicit type casting possible when both types are compatible and the destination type is larger than the source.

In Explicit conversion never take place automatically. Converting a double or long to an int is not possible because it requires more storage space. For a conversion we use an explicit conversion.

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Example-1 :

//between primitive data type

    public class TypeCast

        {

            public static void main(String args[])

                {

                    //Implicit Type Casting or Downcasting

                    int a=10;

                    long b=a;

                    double d=a;

                    System.out.println("\nInteger a ="+a+" Long b= "+b+" Double d= "+d);

                    //Explicit Type Casting or Upcasting

                    d=12.55;

                    b=1234;

                    a=(int)b;

                    System.out.println("\nLong b= "+b+ " Integer a ="+a);

                    a=(int)d;

                    System.out.println("\nDouble d= "+d+ " Integer a ="+a);

               }

      }

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Example-2 :

//between Objects

//Object Type Casting

    class Object

        {

             void main()

                {

                    //Object Type Casting

                    System.out.println("Test");

                }

        }

    public class Object1 extends Object

       {

                public static void main(String args[])

                {

                    Object O1=new Object();

                    Object1 O2=new Object1();

                    O1=O2;

                   

                }

       }

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