CODEWITHSUNDEEP
javacasting
thecodejack
thecodejack

Reputation: 13379

Generic Object typecasting

I have an object, want to convert the generic object to class object. I thought the following should work. But it doesn't:

Object o1=itr.next();
Class cls=o1.getClass();
Object obj=(cls) o1;

What can the error be? How can I do this correctly?

Update: Here i have the list of objects that belongs to different classes. I will be using each class in each loop to convert to XML or JSON string. for this i want to get the class and object it belongs.

Upvotes: 1

Views: 938

Answers (4)

Koraktor
Koraktor

Reputation: 42953

You have to call the cast method on the Class object:

cls.cast(o1)

Upvotes: 6

Tom
Tom

Reputation: 4180

If your iterator returns Objects that actually are of the type Class this might work:

Object o1=itr.next();
Class clazz = (Class)o1;

To be honest, your question is not really clear to me.

Upvotes: 0

Nirmal- thInk beYond
Nirmal- thInk beYond

Reputation: 12064

Object o1=itr.next();
Class cls=o1.getClass();
Object obj=(cls) o1; //whats does it make sense casting Object by object? o1 and obj both are object

and it can be cast by type T, not class

Upvotes: 0

Ted Hopp
Ted Hopp

Reputation: 234857

This syntax:

Object obj=(cls) o1;

is not allowed. You can only cast to a type and cls is an object of type Class, not a type itself. What are you trying to accomplish with this? You could just as well write:

Object obj = o1;

since any reference type is assignment-compatible with Object (and, besides, o1 is already of type Object).

Upvotes: 3

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