Downcasting

[ABHIJEET BUDKE]

Hello

How to implement Downcasting in following code

class parent
{
 public void method1()
 {
   System.out.println("Inside parent method 1");
 } 
  public void method2()
 {
   System.out.println("Inside parent method  2");
 }
 
}
class child extends parent
{
  public void method1()
 {
   System.out.println("Inside child method 1");
   method2();
 }
   public void method2()
 {
   System.out.println("Inside child method 2");
 }
    public void method3()
 {
   System.out.println("Inside child  metohd 3");
 }
     public void method4()
 {
   System.out.println("Inside  child method 4");
 }
 
}    

i try this code
child c1=(child) new parent();
for compile time itis ok
but for run time it gives exception
Exception in thread "main" java.lang.ClassCastException: parent cannot be cast to child

thanks in advance

[Pranav Bhatt]

Hi,
check the below thread with good discussion on casting. This may help you out-:

Casting

[gurneeraj singh]

Parent p=new C();
child c1=(child) p;

If you compile your code with these lines your code will run fine at runtime.

In your case new parent() object has the no knowledge of child class that's why at run time it just broke down.
(cast) operator is used for asking compiler to skip checking the compatibilty of the the two operands on either side of = operator, that is why it was fine at compile time.