Casting

[Geetha Arthanari]

class Animal
{
public String noise()
{
return "animal";
}
}

class Dog extends Animal
{
public String noise()
{
return "dog";
}
}

class Cat extends Animal
{
public String noise()
{
return "cat";
}
}

class Demo
{
public static void main(String args[])
{
Animal a1 = new Dog();
Cat ca = (Cat)a1;
System.out.println(ca.noise());
}
}

Output is:
Exception is thrown at run time
Can anybody explain this please?...

[srinivas.b]

Hi ,

As per the above example Cat and Dog have no relation ship and both belong to Animal category so RuntimeException occurs ( Cat ca = (Cat)a1 because your trying to assign dog object to cat (Since Animal pointing to Dog)
and another point is that you can't assign a super class object to a sub class even thought you type cast it.

for Ex: Animal a1 = new Animal();
Cat ca = (Cat)a1;

[srinivas.b]

Hi ,

As per the above example Cat and Dog have no relation ship and both belong to Animal category so RuntimeException occurs ( Cat ca = (Cat)a1 because your trying to assign dog object to cat (Since Animal pointing to Dog)
and another point is that you can't assign a super class object to a sub class even thought you type cast it.

for Ex: Animal a1 = new Animal();
Cat ca = (Cat)a1;

[srinivas.b]

Hi ,

As per the above example Cat and Dog have no relation ship and both belong to Animal category so RuntimeException occurs ( Cat ca = (Cat)a1 because your trying to assign dog object to cat (Since Animal pointing to Dog)
and another point is that you can't assign a super class object to a sub class even thought you type cast it.

for Ex: Animal a1 = new Animal();
Cat ca = (Cat)a1;

[Bert Bates]

let's close this duplicate...