Question

(Catching Exceptions with Superclasses) Use inheritance to create an exception superclass

(called ExceptionA) and exception subclasses ExceptionB and ExceptionC, where ExceptionB inherits from ExceptionA and ExceptionC inherits from ExceptionB. Write a program to demonstrate that the catch block for type ExceptionA catches exceptions of types ExceptionB and ExceptionC.

Answer 1

Solution:

class ExceptionA extends Exception

{

public ExceptionA(String message)

{

   super(message);

}

public static void getExceptionA() throws ExceptionA

{

   throw new ExceptionA("Exception A");

}

}

class ExceptionB extends ExceptionA

{

public ExceptionB(String message)

{

   super(message);

}

public static void getExceptionB() throws ExceptionB

{

   throw new ExceptionB("Exception B");

}

}

class ExceptionC extends ExceptionB

{

public ExceptionC(String message)

{

   super(message);

}

public static void getExceptionC() throws ExceptionC

{

   throw new ExceptionC("Exception C");

}

}

class Main

{

public static void main(String[] args)

{

   try

   {

     getExceptionA();

   }

   catch(ExceptionA ea)

   {

     ea.printStackTrace();

   }

  

   try

   {

     getExceptionB();

   }

   catch(ExceptionA ea)

   {

     ea.printStackTrace();

   }

  

   try

   {

     getExceptionC();

   }

   catch(ExceptionA ea)

   {

     ea.printStackTrace();

   }

}

public static void getExceptionA() throws ExceptionA

{

   throw new ExceptionA("Exception A");

}

public static void getExceptionB() throws ExceptionB

{

   throw new ExceptionB("Exception B");

}

public static void getExceptionC() throws ExceptionC

{

   throw new ExceptionC("Exception C");

}

}

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