Question

JAVA

Write a program that demonstrates how various exceptions are caught with

catch (Exception exception)

This time, define classes ExceptionA (which inherits from class Exception) and ExceptionB (which inherits from class ExceptionA). In your program, create try blocks that throw exceptions of types ExceptionA, ExceptionB, NullPointerException and IOException. All exceptions should be caught with catch blocks specifying type Exception.

Answer 1

import java.io.IOException;

//Exception A class
class ExceptionA extends Exception {
   private String msg;

   public ExceptionA(String aMsg) {
       super();
       msg = aMsg;
   }

   @Override
   public String toString() {
       return msg;
   }

}

// Exception B class
class ExceptionB extends ExceptionA {

   public ExceptionB(String aMsg) {
       super(aMsg);
   }

   @Override
   public String toString() {
       return super.toString();
   }

}

public class ExceptionTest {
   public static void main(String[] args) {
       try {
           // throwing ExceptionA and catching it
           throw new ExceptionA("ExceptionA example..!!!");
       } catch (ExceptionA e) {
           System.out.println(e);
       }
       try {
           // throwing ExceptionB and catching it
           throw new ExceptionB("ExceptionB example..!!!");
       } catch (ExceptionB e) {
           System.out.println(e);
       }
       try {
           // throwing NullPointerException and catching it
           throw new NullPointerException("NullPointerException example..!!!");
       } catch (NullPointerException e) {
           System.out.println(e);
       }
       try {
           // throwing IOException and catching it
           throw new IOException();
       } catch (IOException e) {
           System.out.println(e);
       }

   }
}

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