??Run Time Polymorphism || Rules for Exception handling with Method Overriding in Java ||throws

Runtime polymorphism or Dynamic Method Dispatch or dynamic binding or late binding or Method overriding

Definition : Declaring a method in sub class which is already present in parent class is known as method overriding.

Inheritance(IS-A) :- one class acquires the properties of another class

Rules for Exception handling with Method Overriding in Java


1.If parent-class method doesn’t declare any exception

Then child-class overriding-method can declare any type of unchecked exception(this is the only possibility)

If child-class overriding-method declares checked-exception, then compiler throws compile-time error


2. If parent-class method declares unchecked–exception

Then child-class overriding-method can declare no exception in the overriding-method of child-class

Then child-class overriding-method can declare any type of unchecked exception
Not necessarily same exception as that of parent-class method
(only for unchecked exception)

If child-class overriding-method declares any checked-exception, then compiler throws compile-time

3. If parent-class method declares checked exception

Then child-class overriding-method can declare no exception in the overriding-method of child-class

Then child-class overriding-method can declare any type of unchecked exception

Then child-class overriding-method can declare same type of checked exception or one of its sub-class or no exception

4. If parent-class method declares combination of both checked & unchecked exceptions

Then child-class overriding-method can declare no exception in the overriding-method of child-class

Then child-class overriding-method can declare any type of unchecked exception

Then child-class overriding-method can declare same type of checked-exception or one of its sub-class or no exception



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