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Q) Explain about “throw”?




A)
->throw keyword is used to throw the exception explicitly(by the developer) after creating exception object.
Ex:
Throw new someException();
Or
someException e = new someException();
throw e;

->within the catch block, if we use throw keyword for throwing the exception programmatically. It is said that the Exception is “rethrown”. i.e. throw keyword is also used to “ rethrowing” of an exception.


voidsomepartofoneproject()
{
       somepartofoneproject();
}
voidsomepartofanotherproject()
{
       try
       {
              //some doubtful code
       }
       catch(ServletException e)
       {
              throw new seriousException();
       }
}

Explanation:
->in this second method contain doubtful code in try block.
->if exception raised by JVM, that is throws to catch block. But catch block is throwing. It is      called re throwing.
->but that re throwing object is not as it is original object of exception.
->catch throws converting new object to calling method.

->outside of the catch exception is throwing called throw.
->inside of the catch exception is again throwing. I.e. called re throwing.
->intimating the one part of application to another part of application is called re throwing.

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