Casting

[Mark Henryson]

  
class Parent
{
   public void method1()
   { 
     System.out.println("Parent - Method1");
   }
}
 
class Child extends Parent
{
  public void method2()
  { 
     System.out.println("Child - Method2");
   }
 
   public void method1()
   { 
     System.out.println("Child - Method1");
   }
}
 
class Kid extends Parent
{
  public void method3()
  { 
     System.out.println("Kid - Method3");
   }
 
   public void method1()
   { 
     System.out.println("Kid - Method1");
   }
}
 
class T
{
  public static void main(String args[])
  {
     Parent p = new Parent();
     Child c = new Child();
     Kid k = new Kid();
 
     Parent p1 = new Child();
     Child c1 = (Child)p1;
     c1.method2();
 
 [B]Parent p2 = new Kid();
    Kid k1 = (Kid)p2;
    k1.method3();  [/B]
 
 [I]k.method3();[/I]
   
  }
}

What is the difference between calling the method thru two different styles I have mentioned in the Code. One with BOLD and another with ITALIC. Both are giving the same result and why we are casting. What are the advantages of casting it?

[satishkumar janakiraman]

Hi,

  Parent p2 = new Kid()   

This line creates an instance of Parent but not an Object of Kid()
hence casting is required in this line

 Kid k1 = (Kid) p2; 

Now k1 is an object of Kid and calls the method method3();

in the line

 k.method3(); 

k is the object of Kid() and directly calls the method3()

i hope, it will clear ur doubts. If i am wrong, please post ur correct answer in this forum

Bye for now
sat

[satishkumar janakiraman]

Hi small change in my previous posting

 Parent p2 = new Kid()   

This line creates a Reference of Parent but not an Object of Kid()
hence casting is required in this line

bye for now
sat

[satishkumar janakiraman]

Hi small change in my previous posting

 Parent p2 = new Kid()   

This line creates a Reference to the Parent but not an Object of Parent.
hence casting is required in this line

bye for now
sat