ClassCastException

[hon123456]

Dear all,
I am trying to learn Java. I found the explanation of
ClassCastException in Sun website as follows. But it seems rather
simple. I don't understand " cast an object to a subclass of which it
is not an instance" in the explanation. Please help me. By the way,
please suggest any good website that explains the ClassCastException in

detail.

From sun:

Thrown to indicate that the code has attempted to cast an object to a
subclass of which it is not an instance. For example, the following
code generates a ClassCastException:

Object x = new Integer(0);
System.out.println((String)x);


Thanks.

 

[Aj-India]

try this...

System.out.println(x.toString());

 

[Thomas Weidenfeller]

I am trying to learn Java. I found the explanation of
ClassCastException in Sun website as follows. But it seems rather
simple.

Yes it is.

I don't understand " cast an object to a subclass of which it
is not an instance" in the explanation.

There is nothing more to say. Do you know what an object is? Do you know
what a subclass is? Do you know what an instance is? If not, get a good
beginners textbook and start to read. Look for the section close to the
start of the book where they talk about objects and types.

Please help me. By the way,
please suggest any good website that explains the ClassCastException in
detail.

A web site explaining class cast exceptions? You are making an affair
out of something which is nothing.

Object x = new Integer(0);
System.out.println((String)x);

An Integer is not a String. Please, get a textbook.

/Thomas

 

[dp_ganatra]

Hi,

This exception is thrown when attempting to cast an object to a class
that it cannot be cast to.

Class cast exception is thrown when an attempt is made to cast an
object which is not of the appropriate runtime type. If u see the
class hierarchy, it will look like ...

java.lang.object
java.lang.Throwable
java.lang.Exception
java.lang.RuntimeException
java.lang.ClassCastException

You can also visit :
http://www.cs.duke.edu/csed/ap/subset/doc/ap/java/lang/ClassCastException.html





You can visit