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Explain the rules of Exception Handling in terms of Method Overriding?

Broadly there are 2 rules.

If superclass method has not declared any exception using throws clause then subclass overridden method cannot declare any checked exception though it can declare unchecked exception.

If superclass method has declared an exception using throws clause then subclass overridden method can do one of the following.

  • sub-class can declare the same exception as declared in the super-class method.
  • subclass can declare the subtype exception of the exception declared in the superclass method. But subclass method can not declare any exception that is up in the hierarchy than the exception declared in the super class method.
  • subclass method can choose not to declare any exception at all.

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