Chathuranga Chandrasekara Chathuranga Chandrasekara - 19 days ago 5
Java Question

Explanation of "ClassCastException" in Java

I read some articles written on "ClassCastException", but I couldn't get a good idea on that. Is there a good article or what would be a brief explanation?

Answer

Straight from the API Specifications for the ClassCastException:

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.

So, for example, when one tries to cast an Integer to a String, String is not an subclass of Integer, so a ClassCastException will be thrown.

Object i = Integer.valueOf(42);
String s = (String)i;            // ClassCastException thrown here.
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