Question

What is wrong with this code? Please bold the changes that were made so this code runs properly. The Problem is: 11.16 (Catching Exceptions with SuperClasses) Use inheritance to create an exception superclass (called Exception) and exception subclasses ExceptionB and ExceptionC, where ExceptionB inherites from ExceptionA and ExceptionC inherits from ExeptionB. Write a program to demonstrate that the catch block for type ExceptionA catches exceptions of types ExceptionB and ExceptionC. I got this far but I'm still getting a lot of errors, please bold the differences and explain what the problems(s) were.

@SuppressWarnings("serial")

/**
*
* @author Lauren
*/
public class Exercise1116A extends Exercise1116 {
public Exercise1116A(String message){
super(message);
}
}

@SuppressWarnings("serial")

/**
*
* @author Lauren
*/
class Exercise1116B extends Exercise1116A{
public Exercise1116B(String message){
super(message);
}
}

@SuppressWarnings("serial")

/**
*
* @author Lauren
*/
class Exercise1116C extends Exercise1116B {
public Exercise1116C(String message){
super(message);
}
}

public class Exercise1116 {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
try
{getExercise1116B ();}
catch (Exercise1116A ea)
{ea.printStackTrace();}
try
{getExercise1116C ();}
catch (Exercise1116A ea)
{ea.printStackTrace();}
}
public static void getExercise1116B() throws Exercise1116B
{throw new Exercise1116B("Exercise1116B");
}
public static void getExercise1116C() throws Exercise1116C
{throw new Exercise1116C("Exercise111C");
}
}

Answer 1

@SuppressWarnings("serial")
/**
 *
 * @author Lauren
 */
class Exercise1116A extends Exception {
        public Exercise1116A(String message) {
                super(message);
        }
}

@SuppressWarnings("serial")
/**
 *
 * @author Lauren
 */
class Exercise1116B extends Exercise1116A {
        public Exercise1116B(String message) {
                super(message);
        }
}

@SuppressWarnings("serial")
/**
 *
 * @author Lauren
 */
class Exercise1116C extends Exercise1116B {
        public Exercise1116C(String message) {
                super(message);
        }
}

public class Exercise1116 {

        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
                // TODO code application logic here
                try {
                        getExercise1116B();
                } catch (Exercise1116A ea) {
                        System.out.println("Caught exception A.");
                        ea.printStackTrace();
                }
                
                try {
                        getExercise1116C();
                } catch (Exercise1116A ea) {
                        System.out.println("Caught exception A.");
                        ea.printStackTrace();
                }
                
                System.out.println("Ending program normally");
        }

        public static void getExercise1116B() throws Exercise1116B {
                throw new Exercise1116B("Exercise1116B");
        }

        public static void getExercise1116C() throws Exercise1116C {
                throw new Exercise1116C("Exercise111C");
        }
}

Your exception A, B, C class should be extending the java.util.Exception class. Then only they can be thrown from your code and be caught.. You can check the screenshot for run.. it works fine.. i have highlighted the code change.