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you can create an customized exception by extending the Exception class

sample code for you:

public class MyException extends Exception {

public MyException(String message)
{...

Cornix
Thanks for the information......

one more question when classdefinition not found exception will occur?

can you please tell me some realtime example that happens on project...

do we have constructor in abstract class?
If we have then what is the use of it?