Core Java - Overriding Methods

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Overriding Methods

Suppose a Super Class method throws an exception and this method is Overriden in the subclass with no exception. Now if you create a super class reference that has a subclass object. This throws a compile time error, Why?

Total Answers and Comments: 7

Last Update: October 13, 2008 Asked by: vishalanand_154

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Best Rated Answer

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Submitted by: vegetto

The answer to this question is pretty obvious that you need to supply the mean or the way to handle the exception either by declaring in the method itself or you should supply the catch statement or handle it in the caller method or the class that is calling the super class method and when you compile it again it would go fine.

cheers!!

Above answer was rated as good by the following members:
sohanonline, Ramesh Israni, veeraraghavane, mrafi007

August 01, 2008 02:56:33

frustu

Member Since: August 2008 Contribution: 1

RE: Overriding Methods

Sub class's method will compile successfully as subclass's method can either specify the exception or not in its signature.But if its specifying it should be that exception,any of the sub classes of exception or any runtime exception. Sub class method can 't add any new exception

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August 07, 2008 03:08:19

midhagaurav

Member Since: August 2008 Contribution: 1

RE: Overriding Methods

While compiling such a program a base class reference always check for the compatibility for the base class method which is overridden in derived class as in future it may contain base class object for which methods calling should be verified for error checking.

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August 07, 2008 23:24:05

r.praveenkumar

Member Since: October 2007 Contribution: 26

RE: Overriding Methods

Just now consider the method in super class do not throw any exception If we are assigning the object of subclass to super class reference and if we invoke the method using that reference the compiler will check whether that method is available in the super class since we are invoking the method only using the super class reference and if it is there then the prog successfully compiles but during execution JVM runs only the sub class version of the method. this is polymorphism.

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August 09, 2008 02:37:30

vegetto

Member Since: June 2008 Contribution: 10

RE: Overriding Methods

The answer to this question is pretty obvious that you need to supply the mean or the way to handle the exception either by declaring in the method itself or you should supply the catch statement or handle it in the caller method or the class that is calling the super class method and when you compile it again it would go fine.

cheers!!

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August 22, 2008 07:45:51

Karuna Reddy

Member Since: June 2007 Contribution: 40

RE: Overriding Methods

sub class exceptions will fire first than super class exceptions

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September 01, 2008 09:20:45

erhansrajpareek

Member Since: September 2008 Contribution: 1

RE: Overriding Methods

Because at run time,Â the super class will compiled first, so it will gives the run time error.

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October 13, 2008 13:03:18

bharathnav

Member Since: October 2008 Contribution: 2

RE: Overriding Methods

"Suppose a Super Class method throws an exception and this method is Overriden in the subclass with no exception. Now if you create a super class reference that has a subclass object. This throws a compile

Latest Answer: Because at run time,Â the super class will compiled first, so it will gives the run time error. ..."

if the object has been created to the subclass and both the methods are non static then the method we overriden doesn't produce any errors or exceptions.

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