Chapter 9.2, Problem 20STQ

Explanation of Solution

Changing “DoubleException” to “Exception” in the “catch” statement:

By giving “Exception” in the place of “DoubleException” in the “catch” statement will not affect the output of the program because, the modified part is same like the original program.

Program:

The modified “catch” statement is highlighted below.

DoubleException.java:

//Define a class

public class DoubleException extends Exception

{

    //Default constructor

    public DoubleException()

    {

        //Call the method from parent class

        super("Double exception thrown!");

    }

    //Parameterized constructor

    public DoubleException(String message)

    {

        //Call the parent class's method

        super(message + " " + message);

    }

}

Main.java:

//Define the main class

class Main

{

    //Define the main method

    public static void main(String[] args)

    {

        //Try block

        try

        {

            //Print the statement

System.out...